indirect clamping terminal blocks · 2019-09-02 · 1 connection capacity the "connection...

series

ZETAmini ®

series

ZETApiù ®

series

ZETA block®

INDIRECT CLAMPINGTERMINAL BLOCKS

FOR THE CONNECTION OF CONDUCTORS IN ELECTRICAL

SYSTEMS FOR CIVIL, TERTIARY AND INDUSTRIAL USE

GENERAL FEATURESAND PRACTICAL EXAMPLES OF USE

IN ACCORDANCE WITH THE STANDARDS EN 60998-1: 2004 and EN 60998-2-1: 2004 EN60947-1: 2007+A1: 2011: 2014 and EN 60947-7-1: 2002

Preface

Cembre S.p.A. has been designing and manufacturing electrical connectors and in-stallation tools since 1969. Over the years, it has progressively expand-ed its presence in the sector, now occupy-ing an important position at European level.

From the experience gained in the man-ufacture of products for the production, transport and distribution of energy, Cem-bre has developed a complete range of in-direct clamping terminal blocks (ZETAmini, ZETApiù and ZETAblock) for the connec-tion of conductors in electrical systems for civil, tertiary and industrial use.

What was the rationale behind Cembre’s development of ZETAmini terminal blocks, ZETApiù single pole terminal blocks and ZE-TAblock indirect clamping power distribu-tion blocks?

Careful analysis into the products on the market has evidenced that electrical system connections are often made with technolog-ically outdated terminals.Their design features make it difficult to cre-ate stable and safe electrical connections in compliance with standards.

This causes problems when preparing the "Declaration of Conformity" of the electrical system with regard to terminal connections, which the installer must prepare and which entails civil and criminal liability on the part of the declarant. (Italian Law 46/90, Italian Presidential Decree 462/2001, etc.).

In this regard, please note that the use of a terminal bearing the CE marking or a mark issued by a third party such as IMQ, is not sufficient in its own right.

The execution of a "state-of-the-art“ system is in fact dependent on the correct use of terminals, which must be installed in com-pliance with the manufacturer's instructions regarding "connection capacity".

1

Connection capacity

The "connection capacity" of a terminal corresponds to the maximum section of the conductor that can be used and the number and section of the conductors with which, in combination , it can be con-nected.

It is certified by the IMQ according to the product standards EN 60998-1:1993-08 + A1:2001, EN 60998-2-1:1993-08, EN 60947-7-1: 2002 and EN 60947-7-2: 2002 and is indicated in the catalogues and on the terminal packaging.

The verification supervisor should ascer-tain whether this connection capacity has been respected.

Only by using marked material, and there-fore certified, and by respecting the man-ufacturer's instructions for use, can a system be created that conforms to the regulations in force.

The improper use of a terminal, even with IMQ marking, may lead to the implementa-tion of a non-compliant system.

If, for example, in the presence of the CE marking or the IMQ mark , the manufac-turer declares a connection capacity lim-ited to combinations of conductors of the same section, the use of the terminal to connect conductors of different sections is to be considered improper ; in this case any damage or inconvenience caused by the connection will be attributable to the install-er who has not complied with the manufac-turer's instructions for use.

Thanks to their original construction fea-tures the ZETA terminal blocks allow the connection of a very wide range of con-ductors and therefore facilitate the con-struction of systems that comply with the standards.

in accordance with the standardsEN 60998-1: 1993-08 + A1: 2001,

EN 60998-2-1: 1993-08EN 60947-7-1: 2002 and EN 60947-7-2: 2002

series

ZETAmini ®

series

ZETApiù®

Anchor plate for indirect clamping

entry holeswith conical inlet

for easy and quickinsertion of the

conductor

Captive screws

terminals with stop ends

for unusedinputs

equipotentialconnection

plate

series

ZETA block®

2

Connection capacity

• Example of connections in which the installer DID NOT RESPECT the connection capacity declared by the terminal manufacturer.

• Examples of connections made with ZETAmini terminals, charac-terised by a large connection ca-pacity.

Example of use of the Z25-1 and Z35-1 type ter-minals inside junction boxes

• The product has been used im-properly, the "IMQ" mark cannot guarantee compliance with stand-ards and the declaration of con-formity is not truthful.

• The installer WAS ABLE TO RE-SPECT the connection capacity declared by Cembre, creating a system in compliance with cur-rent regulations.

Example of use of Z6-1, Z10-1and Z16-1 type terminals inside junction boxes

3

Connection capacityComparative table of ZETAmini and other terminals on the market

CEM

BR

E

AR

NO

CA

NA

LI a

BM

bELE

CO

cSC

AM

E d

TYPE

Sect

ion

mm

²

Conn

ectio

n ca

pacit

y **

N

° of C

ondu

ctor

s pe

r Se

ctio

n m

m²

Flex

ible

TYPE

Sect

ion

mm

²

Conn

ectio

n ca

pacit

y N°

of C

ondu

ctor

s pe

r Sec

tion

mm

²TY

PESe

ctio

nm

m²

Conn

ectio

n ca

pacit

y N°

of C

ondu

ctor

s pe

r Sec

tion

mm

²TY

PESe

ctio

nm

m²

Conn

ectio

n ca

pacit

y N°

of C

ondu

ctor

s pe

r Sec

tion

mm

²TY

PESe

ctio

nm

m²

Conn

ectio

n ca

pacit

y N

° of C

ondu

ctor

s pe

r Se

ctio

n m

m²

Flex

ible

Flex

ible

Flex

ible

Flex

ible

Z2.5

-12.

5

2÷

2 X

2.5

2÷3

X 1

.5

2÷

5 X

1.0

2÷6

X 0

.75

2÷

10 X

0.5

0

2 ÷1

8 X

0.4

÷ 0.

6 m

m

single

wire

for i

nter

com

E22

1

2÷3

X 1

2÷

3 X

0.75

2÷

4 X

0.50

BM 9

911.

52÷

3 X

1.5

2÷

3 X

1.0

2÷

4 X

0.75

E23

1.5

2÷

3 X

1.5

2÷

3 X

1

2÷4

X 0.

7581

2,37

21.

5

1÷

3 X

2.5

1÷

2 X

1.5

1÷

3 X

1.0

2÷

4 X

0.75

B25

2.5

2÷

3 X

2.5

2÷

3 X

1.5

2÷

4 X

1.0

BM 9

922.

5

2÷3

X 2.

5

2÷3

X 1.

5

2÷4

X 1.

0E2

52.

5

2÷3

X 2.

5

2÷3

X 1.

5

2÷4

X 1.

081

2,37

42.

5

1÷

3 X

4

1÷2

X 2.

5

2÷3

X 1.

5

2÷4

X 1.

0

Z6-1

6

2÷

2 X

6

2÷3

X 4

2÷4

X 2

.5

2÷

6 X

1.5

2÷8

X 1

.0

2÷

10 X

0.7

5

2÷12

X 0

.50

(1

x 6)

+ (4

x 1.

5)

(1 x

6) +

(2 x

2.5)

B40

4

2÷3

X 4

2÷

3 X

2.5

2÷

4 X

1.5

BM 9

924

4

2÷3

X 4

2÷

3 X

2.5

2÷

4 X

1.5

E26

4

2÷3

X 4

2÷

3 X

2.5

2÷

4 X

1.5

812,

375

4

1÷

3 X

6

1÷2

X 4

2÷

3 X

2.5

3÷

4 X

1.5

B60

6

2÷3

X 6

2÷

3 X

4

2÷4

X 2.

5BM

993

6

2÷

3 X

6

2÷3

X 4

2÷

4 X

2.5

E27

6

2÷3

X 6

2÷

3 X

4

2÷4

X 2.

581

2,37

66

1÷

3 X

10

1÷2

X 6

1÷

2 X

4

2÷3

X 2.

5

3÷4

X 1.

5

Z10-

110

2÷

2 X

10

2÷

3 X

6

2÷

5 X

4

2÷

8 X

2.5

2÷12

X 1

.5

2÷

20 X

1.0

2÷25

X 0

.75

(1 x

6) +

(1 x

4) +

(2 x

2.5)

+ (3

x 1.

5)

B100

10

2÷3

X 6

2÷

3 X

4BM

994

10

2÷3

X 10

2÷

3 X

6

2÷4

X 4

E29

10

-

2÷3

X 6

2÷

3 X

481

2,37

810

1÷

3 X

16

1÷2

X 10

2÷3

X 6

3÷

4 X

4

Z16-

116

2÷

2 X

16

2÷

3 X

10

2÷

5 X

6

2÷

8 X

4

2÷

12 X

2.5

2÷18

X 1

.5

B160

16

2÷3

X 16

2÷

3 X

10

2÷3

X 6

BM 9

9516

2÷

3 X

16

2÷3

X 10

2÷

3 X

6E3

016

-

2÷

3 X

10

2÷3

X 6

812,

379

16

1÷

3 X

25

1÷2

X 16

2÷

3 X

10

3÷4

X 6

Z25-

125

2÷

2 X

25

2÷

3 X

16

2÷

4 X

10

2÷

8 X

6

2÷

11 X

4

4÷

16 X

2.5

B250

25

2÷3

X 25

2÷

3 X

16

2÷3

X 10

BM 9

960

25

2÷3

X 25

2÷

3 X

16

2÷4

X 10

E32

25

-

2÷3

X 16

2÷

3 X

10

Z35-

135

2÷

2 X

35

2÷

3 X

25

2÷

4 X

16

2÷

7 X

10

2÷

11 X

6

4÷

17 X

4

5÷

28 X

2.5

B350

35

2÷3

X 35

2÷

3 X

25

2÷3

X 16

BM 9

961

35

2÷3

X 35

2÷

3 X

25

2÷3

X 16

E35

35

-

2÷3

X 25

2÷

3 X

1681

0.43

5/TR

35

1÷

3 X

50

1÷2

X 35

1÷

3 X

25

2÷4

X 16

a Inf

orm

atio

n ta

ken

from

the

web

site

May

20

07

** In a

dditi

on, c

ombi

natio

ns o

f the

con

duct

ors

prov

ided

for

in t

he s

peci

fic fi

eld

can

also

be

conn

ecte

d

prov

ided

tha

t th

e re

sulti

ng o

vera

ll se

ctio

n do

es n

ot

exce

ed d

oubl

e th

e no

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al s

ectio

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orm

atio

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from

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ue2

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ditio

n

c Inf

orm

atio

n ta

ken

from

the

"Cat

alog

ue '9

9"

d Inf

orm

atio

n ta

ken

from

the

web

site

May

20

07

4

What is direct clamping?

conductor

uncompressed elementary

wiresscrews

bushing

The screw operates directly on the conductors causing signifi-

cant deformation, in addition, the abrasive action due to the rota-

tional movement during clamping seriously compromises the integ-

rity of the elementary wires.

The clamping screw does not compress 100% of the conductors contained in the contact bushing, as its diameter is great-er than that of the screw. This leads to an increase in the current density in the compressed conductor sec-tion of the screw and an inevitable overheating.

Sectional view of a direct clamping terminal

For direct clamping, the screw of the termi-nal directly presses the conductor against the bushing, usually made of brass.

The conductor receives two stresses from the screw simultaneously: compression between the screw head and the bushing stop wall, and rotation, due to the move-ment that the screw itself must make in order to advance.

In practice only one part of the elementary conductor wires, those directly under the screw, are pressed against the bushing and therefore contribute to the electrical con-nection; many of these, as a result of the rotation action caused by the screw, are de-formed to such an extent as to compromise their integrity.

In addition, some elementary wires, those that are outside the screw compression area, do not actively contribute to the elec-trical connection; the actual section that carries current is therefore less than the nominal section of the conductor. In this objectively critical situation, possible over-loads can lead to dangerous overheating and therefore to a sudden decay of the con-nection.

5

And indirect clamping?

screws

plate

conductor

bushing

Sectional view of an indirect clamping terminal

Indirect clamping is a system widely used on various devices, such as automatic switch-es, relays, equipment terminals, etc., to make an electrical connection between a conductor and a fixed element. The connec-tion is made by the pressure exerted by a moving element under the indirect action of a screw.

The conductor is practically compressed between two parallel surfaces, one fixed and the other mobile, until it reaches a static situation in which all the elementa-ry wires, perfectly integrated, contribute homogeneously in the transport of the cur-rent.

The result: the connection made in this way is exceptionally stable over time; the extremely low crossing resistance value is practically impervious to thermal changes generated by possible overloads; the very structure of the connector, similar to a closed cage, "breathes elastically", supporting thermal deformations without loosening the connec-tion.

Cembre has always adopted indirect clamp-ing in its Zetamini , ZETApiù and Zetablock terminals which, combined with a careful se-lection of materials and treatments, has al-lowed the creation of products that embody the best on the market in this sector.

6

How does a connection behave over time?

Cembre's goal in the design and manu-facture of its connectors is to come as close as possible to the optimum condi-tion for continuous, intact conductors. A correctly executed connection, when it is made, has characteristics practi-cally similar to the intact conductor, but over time it suffers from "ageing", to a greater or lesser extent, depending on the types of terminals used and their in-stallation.The most obvious effect of this aging is an increase in electrical resistance, which corresponds to an increase in temperature.This situation does not cause any prob-lems in a connection up to standard made to quality terminals that have been installed correctly.If, on the other hand, the connection has been made with poor quality ter-minals or without respecting their con-nection capacity, a critical condition is created that develops over time as it does not trigger any system protection intervention (fuses or magnetothermal switches). In practice, the connection progressive-ly heats up until it reaches the critical temperature of the materials insulat-ing the cable or terminal . Connections of different voltages or currents may come into contact with each other, giving rise to short circuits or ignition caused by particles of insu-lating material at high temperatures in contact with flammable or combustible material.This is what is often diagnosed by fire fighters as "Fire due to electrical short circuit".

The method commonly used to evaluate the behaviour of a connection over time is to subject it to an ageing test with thermal cycles.

The diagram and the graph opposite (Fig. 1 and Fig. 2) refer to a compar-ative test with thermal cycles between indirect clamping ZETA terminals and direct clamping terminals.

In our case, we used PVC insulated con-ductors of 6 mm² section , ZETAmini type Z6-1 indirect clamping terminals and direct clamping terminals with brass bushing and steel screw ; the maximum connection capacity for both types is 2x6 mm². In the circuit series a current of 35 A was made to circu-late, such as to generate a tempera-ture of 70 ° C on the reference conduc-tor . For each cycle, the power supply last-ed 30 minutes, followed by 30 minutes of forced cooling to room temperature; the temperatures of the two terminals and conductor were measured at reg-ular intervals. Overall, there were 150 cycles. The graph shows how the direct clamp-ing terminal undergoes a significant temperature increase already from the first cycles until it reached, after about 100 cycles, the critical temperature of softening of the conductor's PVC insula-tion, which is 80°C , and at the end of the test it had reached about 100°C.

7

120

110

100

90

80

70

600 50 100 150

T conductor[°C]

T indirect clamping ZETAterminal [°C]

T direct clamping terminal [°C]

No. of cycles

Tem

pera

ture

[°

C]

indirect clamping ZETA terminal

directclamping terminal

Diagram of the test circuit

Sect. Cond. = 6

I = 35 A ~

Thanks to their original construction characteristics, ZETA terminals enable connections to be made with a stable contact resistance over time.

The behaviour of the ZETA terminal blocks during the thermal cycles with respect to a direct clamping terminal and with a brass bushing, is shown in the graph below.

Two clamps, one with indirect clamping and the other with direct clamping, connected in series, were energised for 30 minutes and cooled for 30 minutes.

The heating/cooling cycle was repeated 150 times, measuring the temperature of the two terminals and of the conductor at regular intervals.

Figure 2

Figure 1

8

9 good reasons to choose ZETAmini and ZETApiù

4x2.5 mm² 6x1.5 mm²

1x4 mm²+

2x2.5 mm²

2x2.5 mm²+

3x1.5 mm²

4x2.5 mm² 6x1.5 mm²

1x4 mm²+

2x2.5 mm²2x2.5 mm²

+3x1.5 mm²

DIRECT CLAMPING TERMINALS

CEMBRE ZETA SERIES INDI-RECT CLAMPING TERMINALS

LIMITED CONNECTION CAPACITYThe number of conductors that can be con-nected is not limited as long as the total of

their section is suited to the nominal section of the terminal; the conductors can have different sections.

AMPLE CONNECTION CAPACITY

Example of terminal with nominal section 6 mm² (flexible)

Difficult insertion of con-ductors due to discon-tinuity between the internal diameter of the contact bushing and that of the insu-lating casing.

Insertion facilitated by the coni-cal entrance in the insulating casing.

The conductors must be twisted together before they are inserted into the contact bushing. This operation takes time and therefore makes it difficult to discon-nect the conductors to find a fault or in-correct connection.

It is not necessary to twist the conductors before they are inserted into the terminal. Any disconnection need-ed is extremely simple.(Time saving)

The screw operates directly on the conduc-tors causing significant deformation, in ad-dition, the abrasive action due to the rotational move-ment during clamp-ing seriously compro-mises the integrity of the elementary wires.

The screw does not operate directly on the conductors; they are compressed be-tween a steel cage and a contact rod.This results in a highly relia-ble connec-tion without compromising the integrity of the elementary wires.

Z6-1example:

NONO

YES NO

YES YES

YES YES

4

9

DIRECT CLAMPING TERMINALS

CEMBRE ZETA SERIES INDI-RECT CLAMPING TERMINALS

The hardened steel cage is a sturdy but elastic structure; during clamping it deforms elastically, accumulating energy thanks to which clamping remains constant during the thermal cycles to which the connection is subjected.

The brass clamping bushing is an extremely rig-id structure, which does not accumulate elastic energy during clamping.Expansions due to thermal cycles typical of normal operation are therefore not compen-sated in any way, thus trig-gering a overheating phenomenon that leads the connec-tion to rapidly deteriorate.

The clamping screw does not compress 100% of the conductors contained in the contact bushing as its diameter is greater than that of the screw. This leads to an increase in the current density in the compressed conductor section of the screw and an inevitable overheating.

The wires are com-pressed evenly and completely thanks to the steel cage and the contact plate. The current transport-ed is distributed naturally and evenly through all the conductors’ elementary wires; this contributes to maintaining stable contact over time.

The transverse dimension is extremely limited thanks to the rectangular shape of the clamping cage.

The transversal dimension of the cap terminals is greater due to the internal circu-lar brass bushing.

The screw of terminals com-monly available on the market can, due to vibrations during transport, loosen complete-ly, causing the terminal to dismantle.

Due to the special design of the ZETAmini and ZETApiù terminals, the screw will remain in place even if completely loose.

INTERCOMSDirect clamping termi-nals are not suitable for connecting small diameter rigid conduc-tors (Ø 0.4÷0.6 mm), as the clamping screw tends to spread them without compressing, or significantly deform them, mak-ing them fragile until they break.

INTERCOMSIndirect clamping terminals make a good connection even on small diameter rigid conductors (Ø 0,4÷0,6 mm) thanks to the steel cage that contains them and compresses them against the contact plate.

5

7

8

9

6

10

One-way indirect clamping terminals

Easy insertion

Captive screws

Anchor platefor

indirect clamping

Example of use of Z6-1, Z10-1and Z16-1 type terminals inside junction boxes

Example of use of Z25-1 and Z35-1type terminals inside junction boxes

Example of use of Z2.5-1 type terminals

inside a round junction box

series

ZETAmini ®

11


• Maximum operating: 85°C

• Self-extinguishing: V-0 (UL 94)

• Nominal voltage: 450V

• Material: polycarbonate body, terminal and screws in electrolytically galvanized steel, anchor plate in electrolytically plated steel

GENERAL FEATURES

Directive 2014/35/UE EN 60998-1: 2004 and EN 60998-2-1: 2004 Norms

"Italian Naval Register" Lloyd's Register of Shipping

1

1

1

Z2.5-1

Z6-1

Z10-1

7.6x20xh23.5

11.5x28xh29

2.5

6

10

1Z16-1 18x34xh3816

1Z25-1 20.8x42.5xh43.425

1Z35-1 25x45xh51.535

TYPE N ° WAYSINTERNAL

PACKAGINGN° pcs

EXTERNALPACKAGING

N° pcs

DIMENSIONSmm

NOMINALSECTION

15.6x32xh32.5

25 500

25 250

10 100

10 100

10 50

10 40

MARKINGS AND MARKS

2.5 mm2

450 VT 85 ° C

6 mm2

450 VT 85 ° C

25 mm2

450 VT 85 ° C

16 mm2

450 VT 85 ° C

10 mm2

450 VT 85 ° C

35 mm2

450 VT 85 ° C

series

ZETAmini ®

12


Z35-12 x 35 mm2 rigid or flexible




2 x 6 mm2 rigid or flexible

Z2.5-12 x 2.5 mm2 rigid or flexible

Maximum capacity: Terminal Type series

ZETAmini ®

Z6-1

13

Z2.5-1 2 x 2.5 R/F2÷3 x 1.5 R/F2÷5 x 1.0 R/F2÷6 x 0.75 R/F2÷10 x 0.5 R/F2÷18 x ∅ 0.4 ÷ 0.6 mmcommunication type wire

2.5

Nominal Section

Connection capacity*No. of Conductors per SectionType

Z6-1

2 x 6 R/F2÷3 x 4 R/F2÷4 x 2.5 R/F2÷6 x 1.5 R/F2÷6 x 1 R/F2÷10 x 0.75 R/F2÷12 x 0.5 R/F(1 x 6 F) + (4 x 1.5 F)(1 x 6 F) + (2 x 2.5 F)

6

Z10-1 2 x 10 R/F2÷3 x 6 R/F2÷5 x 4 R/F2÷8 x 2.5 R/F2÷12 x 1.5 R/F2÷20 x 1 R/F2÷25 x 0.75 R/F

10

Z16-1 2 x 16 R/F2÷3 x 10 R/F2÷5 x 6 R/F2÷8 x 4 R/F2÷12 x 2.5 R/F2÷18 x 1.5 R/F

16

Z25-1 2 x 25 R/F2÷3 x 16 R/F2÷4 x 10 R/F2÷8 x 6 R/F2÷11 x 4 R/F4÷16 x 2.5 R/F

25

Z35-1 2 x 35 R/F2÷3 x 25 R/F2÷4 x 16 R/F2÷7 x 10 R/F2÷11 x 6 R/F4÷17 x 4 R/F5÷28 x 2.5 R/F

35

(1 x 6 F) + (1 x 4 F) + (2 x 2.5 F) + (3 x 1.5 F)

Connection capacity of ZETAmini series one-way terminals

R = rigid conductor F = flexible conductor

*A mixture of conductor sizes may be connected to the terminal block provided that the sum of their sections is less than twice the nominal section.

14

Unipolar multi-way indirect clamping terminal blocks

Example of use of the Z6-5D type terminal blocks inside a junction box

Example of use of the Z16-5ND series terminal blocks inside a junction box

Example of use of the Z6-3 and Z6-5 type

terminals inside boxes for civil use

Captive screws

Easy insertion

Equipotential connection

plate

series

ZETApiù®

15

Unipolar multi-way indirect clamping terminal blocks

• Maximum operating temperature: 85°C


• Nominal voltage: 450V

• Material: polycarbonate body, terminal and screws in electrolytically galvanized steel, connection plate in electrolytically plated ETP copper.

GENERAL FEATURES

TYPE N° WAYS MARKINGS AND MARKSPACKAGINGN° pcs

DIMENSIONSmm

NOMINALSECTION

20

10

30

10

35x23xh27.5

35x40xh36.5

23x23xh27.5

23x40xh36.5

6 6 15

10

23x43xh28.5

23x53xh33

3 16 20

15

38x31.3xh38

38x50xh44

4 16 15

10

27x54xh37

27x58xh43

10 6 10

15

35x43xh28.5

35x53xh33

D = version with DIN rail mounting

8 (2+6) (2) 16 + (6) 6 15

10

35.5x50xh36.5

35.5x57xh42

5 6

3 6

5 16 10

4

61x31.5xh38

61x50xh44

16 mm2

450 VT 85 ° C

16 mm2

450 VT 85 ° C

6 mm2

450 VT 85 ° C

11 (1+10) (1) 35 + (10) 6 58x43xh42

58x53xh47

10

1035÷6 mm2

T 85 ° C

6 (2+4) (2) 35 + (4) 16 83x41xh43

83x49xh52

8

535÷16 mm2

450 VT 85 ° C

5

54 35

37x85xh42

37x85xh48

10 (2+8)Z50-10D (2) 50 + (8) 25 77.5x55xh49 6

26 (2+24)Z35-26D (2) 35 + (24) 10 151x52xh48 435÷10 mm2

T 85 ° C

6 mm2

450 VT 85 ° C

10

53 35

53x48.5xh42

53x50xh4835 mm2

450 VT 85 ° C

16÷6 mm2

450 VT 85 ° C

12 (2+10) (2) 16 + (10) 6 104.5x32.5xh36.5

104.5x50xh42

8

5

16÷6 mm2

450 VT 85 ° C

Z6-3Z6-3DZ6-5Z6-5DZ6-6Z6-6DZ6-10Z6-10DZ16-3Z16-3DZ16-4Z16-4DZ16-5NZ16-5NDZ16-8Z16-8DZ16-12Z16-12DZ35-3Z35-3DZ35-4Z35-4DZ35-6Z35-6DZ35T-11 Z35T-11D

35 mm2

450 VT 85 ° C

16 mm2

450 VT 85 ° C

EN 60998-1: 2004 andEN 60998-2-1: 2004 Norms

"Italian Naval Register" Lloyd's Register of Shipping

series

ZETApiù®

Directives 2014/35/UE

50÷25 mm2

T 85 ° C**

EN60947-1: 2007+A1: 2011: 2014and EN 60947-7-1: 2002 Norms

**

16

ZETApiù unipolar multi-way terminal blocksFurther Features


plate

Body

Easy insertion

Bushing

Captive screws


plate

The ZETApiù unipolar multi-way terminal blocks are characterised by a certain num-ber of inputs/outputs, of an equal or differ-ent calibre, electrically connected to each other by a plated copper plate. A ZETApiù terminal block therefore creates conduc-tors junctions and/or bypasses with the same voltage.

This particular construction has clear advantages compared to some tradition-al systems; for example, it is possible to perform the single disconnection of the conductors, required in particular fields of application by the CEI 64-8 and 64-8 / 710 standards.

Fault-inspection is very simple, as are continuity checks and resistance meas-urements on sections of the system.Installation times are also reduced com-pared to the use of modular terminals requiring jumpers or the use of perfo-rated rods needing to be connected by means of cable terminals.

In the diagrams opposite, the ele-ments that make up the ZETApiù terminal blocks are clearly visible: the electrolytically plated ETP copper equipotential connection plate, the elec-trolytically galvanized steel bushings and screws, the polycarbonate body with an appropriate shape so as to create captive screws and facilitate the insertion of con-ductors.

The ZETApiù terminal blocks are available in mobile version or with a rear connection for mounting on DIN rails.

They have an IP20 degree of protection, which makes them suitable for phase connections; some terminal blocks (Z35T-11, Z35-26D, Z50-10D) are instead specifically designed for the construction of earthing nodes.

17

ZETApiù unipolar multi-way terminal blocksCrossing resistance

MAXIMUM CURRENT: The ZETApiù terminal blocks can with-stand currents higher than the maximum stationary capacity of the cable with the largest section that can be connected to the terminal block itself. (table 2)The terminal blocks are able withstand the stresses caused by the acceptable currents in ordinary operation wiring

and by the short-circuit currents deter-mined according to the characteristics of the protection devices. The maximum short-circuit current that can be tolerat-ed by the terminal blocks (for a period of 1 second) without any functional damage is given in Table 3.

CURRENT Max (A)(stationary)

60

100

170

220

TABLE 2

Z6Z16Z35Z50

TERMINAL BLOCKseries

TABLE 3

Time(S)

1111

TERMINAL BLOCKseries

Z6Z16Z35Z50

Icc Max(A)

1000270060008500

The crossing resistance is the parame-ter that indicates whether, and in what proportion, the terminal block has a

higher resistance than a conductor of equal length and section.As regards the ZETApiù terminal blocks, the crossing resistance is practically equal to the cable resistance (see table 1). This result is obtained thanks to the clamping system and the characteris-tics of the equipotential plate in plated copper with a section equal to or great-er than the maximum section of the conductor that can be housed in the terminal block.

TERMINAL BLOCKType

CONNECTION(H07 VK cable)

TABLE 1

(1) RESISTANCE CABLE (mΩ)length 1 m

(2) RESISTANCE CABLE-TERMINAL BLOCK

(mΩ) total length 1 m

Z6-3Z6-3Z6-5Z6-5Z6-5Z16-3Z16-3Z16-5NZ16-5NZ16-5NZ16-12Z35-6Z35-6Z35-6

1.5 – 1.5

6 – 6

1.5 – 1.5

6 – 1.5

4 – 4

2.5 – 2.5

16 – 16

6 – 6

16 – 6

16 – 16

16 – 6

35 – 35

35 – 16

35 – 6

12.4262.924

12.4267.6754.4567.8411.1232.9242.0231.1232.0230.7770.9831.867

11.9252.976

12.1687.0124.4357.7911.1582.9402.0121.1411.9460.7670.9381.768

(1) Resistance of the H07 VK type cable used in the connection.

In the case of a junction without section variation, the resistance is relative to 1 m of cable. In the case of junction with a section variation, the resistance is relative to 0.5 m of cable with a larger section plus 0.5 m of cable with a smaller section (example: connection 16-6 using Z16-12, R cable = R 0.5 m cable section 16 mm² + R 0.5 m cable section 6 mm²).

(2) Cable-to-terminal connection resistance for a total length of 1 m

TerminalZ6-5

Terminal Z16-12

LTerminal

LTerminal

L cable L cable

18

Unipolar multi-way terminal

Z16- 5N • Z16- 5ND

Z6-3 • Z6-3D

Z6-5 • Z6-5D

Z16- 12 • Z16- 12D

Z16-3 • Z16-3D

Z6-10 • Z6-10D

Z6-6 • Z6-6D

Z16-8 • Z16-8D

Z16-4 • Z16-4D

Maximum capacity: Terminal block Type


2 x 16 mm2 10 x 6 mm2 flexible






2 x 16 mm2 6 x 6 mm2 rigid or flexible

4 x 16 mm2 Flexible

+

D = version with DIN rail mounting

+

series

ZETApiù®

19

blocks indirect clamping ways

*

*

* *

2 x 35 mm2 4 x 16 mm2 rigid or flexible Z35-6 • Z35-6D

Z35-26D2 x 35 mm2 24 x 10 mm2 rigid or flexible

3 x 35 mm2

rigid or flexible Z35- 3 • Z35- 3D

+

+

1 x 35 mm2 10 x 6 mm2 rigid or flexible Z35T-11 • Z35T-11D+

Z50-10D2 x 50 mm2 8 x 25 mm2 rigid or flexible

+

Maximum capacity: Terminal block Type

4 x 35 mm2

Flexible Z35-4 • Z35-4D

* For earthing circuitsD = version with DIN rail mounting

series

ZETApiù®

20

Connection capacity of the terminal blocks

Z16-5N Z16-5ND

1 x 16 R/F 1 x 10 R/F 1÷2 x 6 R/F 1÷3 x 4 R/F 1÷4 x 2.5 R/F 1÷8 x 1.5 R/F

16 5 x 16


1 x 6 R/F 1 x 4 R/F 1÷2 x 2.5 R/F 1÷2 x 1.5 R/F 1÷4 x 1 R/F

Z16-8 Z16-8D 16/6

2 x 16

6 x 6

Z16-12 Z16-12D 16/6

2 x 16

10 x 6

1 x 16 F 1 x 10 F 1÷2 x 6 F 1÷3 x 4 F 1÷4 x 2.5 F

1 x 6 F 1 x 4 F 1÷2 x 2.5 F 1÷2 x 1.5 F 1÷4 x 1 F

Z16-4 Z16-4D

1 x 16 F 1 x 10 F 1÷2 x 6 F 1÷3 x 4 F 1÷4 x 2.5 F 1÷8 x 1.5 F

16 4 x 16

Z6-3 Z6-3D


6

SectionNominal

3 x 6

N° waysper Nominal Section

Connection capacity of each wayNo. of Conductors per SectionType


Z6-5 Z6-5D 6 5 x 6

Z6-6 Z6-6D 6 6 x 6

Z6-10 Z6-10D 6 10 x 6

Z16-3 Z16-3D


16 3 x 16



21

ZETApiù series unipolar multi-way

Z35-3 Z35-3D

35 3 x 35

Nominal Section

N° waysper Nominal Section

Connection capacity of each wayNo. of Conductors per SectionType

Z35-T11*

Z35-T11D* 35/6

1 x 35

10 x 6

1 x 35 R/F 1 x 25 R/F 1 x 16 R/F 1 x 10 R/F


1 x 35 R/F 1 x 25 R/F 1÷2 x 16 R/F 1÷3 x 10 R/F 1÷6 x 6 F Z35-6

Z35-6D 1 x 16 R/F 1 x 10 R/F 1÷2 x 6 R/F 1÷3 x 4 R/F 1÷5 x 2.5 F

35/16

2 x 35

4 x 16

Z35-4 Z35-4D

35 4 x 35

1 x 35 R/F 1 x 25 R/F 1÷2 x 16 R/F 1÷3 x 10 R/F 1÷6 x 6 R/F

1 x 10 R/F 1 x 6 R/F 1÷2 x 4 R/F 1÷4 x 2.5 R/F

35/10

2 x 35

24 x 10

1 x 50 R/F 1 x 35 R/F 1÷2 x 25 R/F 1÷4 x 16 R/F

1 x 25 R/F 1÷2 x 16 R/F 1÷3 x 10 R/F 1÷6 x 6 R/F 1÷9 x 4 R/F

50/25

2 x 50

8 x 25

1 x 35 F 1 x 25 F 1÷2 x 16 F 1÷3 x 10 F 1÷6 x 6 F

1 x 35 R/F 1 x 25 R/F 1÷2 x 16 R/F 1÷3 x 10 R/F 1÷5 x 6 R/F

Z50- 10D*

Z35- 26D*

R = rigid conductor F = flexible conductor

* A mixture of conductor sizes may be connected to the terminal block provided that the sum of their sections is less than the nominal section.

* For earthing circuits

22

Quadrupole and bipolar indirect clamping power distribution blocks

Example of use of the Z50-DP12-160 type terminal blocks inside electrical distribution panels

100, 125 and 160 A power distribution blocks with 7, 14 and 12 ways respec-tively for each phase.The wide range of connectable sections (from 1 to 50 mm2) and the compact dimensions make the power distribution blocks ideal for wiring in control and dis-tribution panels.The two-sided input (with the only ex-ception of the Z35-DP14B-125 model) allows the conductors to be distributed in a homogeneous and orderly manner, making it easier to wire and carry out any subsequent work on all phases.Wiring is further facilitated by the coni-cal inlet holes and the loosened captive screws.Indirect clamping terminals guarantee excellent stability over time.

series

ZETA block®

23

Indirect clamping quadrupole and bipolar power distribution blocks

TYPE N° PHASES MARKINGS AND MARKSPACKAGING

N° pcsDIMENSIONS

mmNOMINALSECTION

4 25 / 6 Z25-DP7-100 70x84xh 45 2

WEIGHTg

290

4 35 / 16/ 6 Z35-DP14-125 137x83xh46 1700

2 35 / 16 / 6 Z35-DP14B-125 137x44xh46 2360

EN 60947-7-1: 2009 Norms

The 100 A and 125 A models come with pre-mounted DIN rail mounting brackets.

SUPPLIED:• 1 label with adhesive wording

TypePermissible short term

nominal current (Icw)

Expected peak current

(Ipk)

Nominalinsulation voltage

(Ui)

Impulse voltage(Uimp)

NominalCurrent

(In)Degree

of self-extinguishing

Z25-DP7-100 800 V 8 kV 100 A 3 kA 18 kA V-0 (UL 94)

Z35-DP14-125 800 V 8 kV 125 A 4.2 kA 18 kA V-0 (UL 94)

Z35-DP14B-125 800 V 8 kV 125 A 4.2 kA 18kA V-0 (UL 94)

Z50-DP12-160 800 V 8 kV 160 A 6 kA 18kA V-0 (UL 94)

51 mm 58.5 mm

61 mm 68.5 mm

MOUNTING ON DIN RAILS:

with spacer

49 mm

59 mm

Z25-DP7-100

49 mm

59 mm

Z35-DP14-125 Z35-DP14B-125

49 mm

59 mm

Z50-DP12-160

50÷25÷16 mm24 50 / 25 / 16 Z50-DP12-160 150x84xh48 1780

• 2 brackets for DIN rail mounting• 1 spacer 10 mm• 4 short screws (2 + 2 spare)• 4 long screws (2 + 2 spare) • 1 label with adhesive wording

ACCESSORIES SUPPLIED FOR MODEL Z50-DP12-160:

35÷16÷6 mm2

35÷16÷6 mm2

25÷6 mm2


• Nominal voltage: 800 V

• Material:

Body in shockproof, self-extinguishing polycar-bonate, terminals and captive screws in electrolyti-cally galvanised steel, connection plate in electrolyt-ically plated ETP copper.

GENERAL FEATURES

Directives 2014/35/UE

24

Connection capacity of the power distribution blocks

Z25-DP7-1002 x 25 mm2 5 x 6 mm2 flexible

+4

Z50-DP12-16042 x 50 mm2 4 x 25 mm2

6 x 16 mm2

flexible

Z35-DP14B-12522 x 35 mm2 2 x 16 mm2

10 x 6 mm2

flexible

Z35-DP14-12542 x 35 mm2 2 x 16 mm2

10 x 6 mm2

flexible

+

+

+

+

+

+

7 (2+5)

14 (2+2+10)

14 (2+2+10)

12 (2+4+6)

Z25-DP7-100

Z35-DP14B-125

Z50-DP12-160

Z35-DP14-125

N°Phases

N° waysper Phase

Maximum capacityper Phase

Power distribution block Type

series

ZETA block®

100 AQUADRUPOLE

125 AQUADRUPOLE

160 AQUADRUPOLE

125 ABIPOLAR

25

Connection capacity of the power distribution blocks

Nominal Section

of each phasemm2

N° waysper Nominal

Sectionof each phase

Connection capacity of each way

No. of Conductors per SectionType

1 x 25 F

1 x 16 F

1÷2 x 10 F

1 x 6 F

1 x 4 F

1÷2 x 2.5 F

1÷2 x 1.5 F

1÷4 x 1 F

Z25-DP7-100 25

6

2 x 25

5 x 6

1 x 35 F 1 x 25 F 1÷2 x 16 F 1÷3 x 10 F

1 x 16 F 1 x 10 F 1÷2 x 6 F 1÷3 x 4 F 1÷4 x 2.5 F

Z35-DP14-12535

16

6

2 x 35

2 x 16

1 x 6 F 1 x 4 F 1÷2 x 2.5 F 1÷2 x 1.5 F 1÷4 x 1 F

10 x 6

1 x 35 F 1 x 25 F 1÷2 x 16 F 1÷3 x 10 F

1 x 16 F 1 x 10 F 1÷2 x 6 F 1÷3 x 4 F 1÷4 x 2.5 F

Z35-DP14B-12535

16

6

2 x 35

2 x 16

1 x 6 F 1 x 4 F 1÷2 x 2.5 F 1÷2 x 1.5 F 1÷4 x 1 F

10 x 6

1 x 50 q F

1 x 35 q F

1÷2 x 25 q F

1 x 25 F

1 x 16 F

1÷2 x 10 F Z50-DP12-160

50

25

16

2 x 50

4 x 25

1 x 16 F

1 x 10 F

1÷2 x 6 F6 x 16

26

Main applications

UNINTERRUPTED

MAST

• For all connections inside junction boxes, recessed or external, as an alternative to the ZETAminimobile terminals.

• For the creation of equipotential nodes, or sub nodes, in bathrooms and shower rooms, as an alternative to modular ter-minals or copper rods to be connected by means of cable terminal.

In the civil-residential and tertiary sector• For the distribution of the phase and the

neutral, or of the three phases and neu-tral, inside the control units or distribution panels for modular appliances, avoiding jumpers between equipment terminals (e.g. automatic switches), only permitted by standard CEI 64- 8 526 under certain conditions.

• For connecting the protective conductors to the earthing mast of the individual res-idential units of buildings, condominiums or public and private offices, ensuring the individual disconnection of the user without interrupting the mast (CEI 64-8 520.1).

Example of use of Z6-3 and Z6-5 type terminal blocks Inside boxes

for civil use

Example of use of the Z16-12D type terminal blocks inside a junction box

to create equipotential nodes

Example of use of the Z50-10D type terminal blocks as an equipo-

tential earthing node

Example of use of the Z6-5D terminal blocks

inside junction boxes

Example of use of the Z16-5ND series terminal blocks inside a

junction box

Example of useof the Z35T-11 terminal blocks

without mast interruption as an equipotential earthing node

Example of useof the Z16-4D terminal blocks

inside junction boxes

series

ZETApiù®

27

Main applications

CONTROL UNITS

FOR DIN MODULE

DEVICES

Examples of use of Z16-8D and Z6-6D type terminal blocks inside control units for DIN module devices

• For all the applications already described for the civil-residential and tertiary sectors for connections in junction boxes, control units and distribution panels.

• For the creation of equipotential nodes and/or sub-nodes, in compliance with the provisions of the standard CEI 64-8 710, in all premises for medical use (inpatient rooms, diagnosis rooms, operating thea-tres, medical and dental offices, etc.).

In medical use premises

Example of use of Z35-6D and Z16-12D type terminal blocks as an equipotential

earthing node of the extraneous conducting parts in electrical systems

Example of use of the Z35-26D type as an equipotential earthing node

Example of use of the Z16-12D type as an equipotential earthing node of extraneous

conducting parts in electrical systems in premises used for medical purposes

Standard EN 64-8710:in residential installationsand in the tertiary sector in bath / shower rooms

(Standard CEI 64-8).

In the civil-residential and tertiary sector

series

ZETApiù®

28

Main applications

In control panelsseries

ZETApiù®USE OF ZETApiù SERIES TERMINALSON DIN RAILS IN CONTROL PANELS

The ZETApiù series terminals with DIN rail connection can be used in the creation of control panels.

Prefabricated distribution panels must comply with the requirements of Standards EN 61439-1 and EN 61439-2.

Example of use of the Z6-10D type terminal blocks inside industrial electrical panels

29

Main applications

In control panelsseries

ZETA block®

Examples of use of ZETAblock series power distribution blocks

type Z50-DP12-160 inside industrial electrical panels

Examples of use of ZETAblock series power

distribution blocks type Z35-DP14B-125

and Z25-DP7-100Inside industrial control panels

Examples of use of ZETAblock series power distribution blocks

type Z35-DP14-125 inside industrial electrical panels

30

Terminal block Z35T-11

UNINTERRUPTED

MAST

Installation of a Z35T-11 terminal blockfor the creation of an equipotential node derived from an

uninterrupted earthing mast

Earthing mast

Prepare the terminal block by separating the two parts that compose it.

Protective conductor

Junctionterminal

Terminal formast

Unsheath the earthing mast by 18 ÷ 20 mm.

Insert the terminal on the unsheathed mast and in-sert the junction terminal.

Re-assemble the terminal block by tightening the mast terminal.

Connect the protective conduc-tors by unsheathing them by 11 to 13 mm.The earthing node is completed.

4

5

6

7

8

9

J

31

Use of ZETApiù terminal blocks in the creation of equipotential systems and nodes

Additional EQS equipotential conductor

PE protective conductor

Artificial earth electrodeNatural earth electrode

Definition of the components of the secondary earth ac-cording to CEI 64-8

FIGURE 1

Hea

ting

Uni

tB

athr

oom

are

a

Earthing network

Main EQP equipotential conductor

Z6-5

Z50-10D

Z6-5

Z6-3

Main earth collector or node

Earth conductor

EARTH SYSTEMS

Regulatory references:STANDARD CEI 64-8GUIDELINE CEI 64-50 GUIDELINE CEI 64-12

An earth system consists mainly of the following components (Fig. 1):A - earthing networkB - earth conductorC - main earth collector or nodeD - PE protective conductorE - main EQP equipotential conductorF - additional EQS equipotential conductor

32

FIGURE 2

Natural earth electrode

Profile stake

Z50-10D


Earth conductorEarth conductor

These components are briefly described below:

A - earthing networkThe earthing network consists of:– natural earth electrode such as • foundation plinths or other metal structures underground– artificial earth electrodes such as • round wire, profiles, tubes • cords, ropes • plates.

These earth electrodes can be made of copper, cop-per-coated steel and galvanised ferrous materials.The earth electrodes must have transverse dimen-sions that ensure good durability, taking into account the nature of the soil and the material used for the earth electrode itself.

The following table shows the minimum dimensional values recommended by the CEI 64.8 Standard for artificial earth electrodes (table 4)

Plate

Cord

Round wire or solidconductor

Corded conductor

Pipe stake

Solid stake

Profile stake

Thickness (mm)

Thickness (mm)Section (mm2)

Section (mm2)

∅ each wire (mm)Cord section (mm2)

external ∅ (mm)Thickness (mm)

∅ (mm)

Thickness (mm)Transverse dimension (mm)

Type ofelectrode

Copper coated steelDimensions

For

layi

ng u

nder

grou

ndFo

r dr

ivin

g in

to

the

grou

nd

15(2) (3)

Copper

3

350

35

1.835303

15

550

TABLE 4

(1) Also in steel without protective coating, provided that the thickness is increased by 50% (minimum section 100 mm 2)(2) Coating for electrolytic deposition: 100 µm(3) Coating for extrusion: thickness 500 µm

Type and dimensions not considered in the Standard

3

3100

50

1.850402

20

550

B - Earth conductor

The earth conductor is used to connect the main earth-ing node to the earthing plate or two earth electrodes to each other. (fig 2)

(1) Hot-dip galvanised steel

(standard CEI 7-6)

33

Z35-6

Earth conductor

Earth conductor

PE protective conductors

The resistance of the earthing network can be meas-ured by disconnecting the protective conductor from the terminal.

FIGURE 3a

FIGURE 3b

Z35-6

PE protective conductors



main EQP equipotential conductor

Main EQP equipotential conductor

C - Main earth collector or node

In each system a terminal block must be set up to which the following must be connected:– the earth conductor– PE protective conductors– main EQP equipotential conductorsThis terminal block is called the main earth collector or node. (Figure 3a)

D - PE protective conductorThe PE protective conductor is used to connect the parts to be earthed, for protection against indirect contacts, to the main earth node.The section of the PE protective conductor must not be less than the value specified in Table 5.The section of each PE protective conductor that is not part of the supply line must not, in any case, be less than:– 2.5 mm2 if mechanical protection is provided– 4 mm2 if no mechanical protection is provided PE pro-

tective conductors may consist of:– multipolar cable cores– bare cables or unipolar cables forming part of the same

wiring as the live conductors – bare cables or unipolar cables not forming part of the

same wiring as the live conductors– metal casings, e.g. Cable sheaths, shields and armour– protective tubes and metal channels or other metallic

conductor casings– metal casings of factory built equipment when: • protection against mechanical, chemical and electro

chemical damage is ensured

Section of the system phase conductors S (mm2)

S 1616 <S 35

S > 35

Minimum section of the corresponding protective

conductor Sp (mm2)

Sp = S

16 Sp

TABLE 5

> S2

• a conductivity at least equal to that obtained for the relative protective duct is ensured

• it is possible to connect other protective conductors at the points provided for the junction

– extraneous conducting parts that satisfy the following conditions:

• electrical continuity is ensured and protection against mechanical, chemical and electrochemical damage is guaranteed;

• the conductivity is at least equal to that of the corre-sponding protective conductor;

• the elements cannot be removed and have been de-signed for use as protective conductors.

Two or more collectors may be used in the same system.Combined with the main earth conductor, an opening device for measuring earth resistance must be provided in an accessible position; this device must only be able to be opened with a tool.

Using a ZETApiù terminal, as the main earth node, it is possible to open the earth circuit at any time to carry out measurements. (fig 3b)

34

EQS PE / 2

EQS PE / 2

MASS MASS

EQS PE / 2

EQS PE EQS PE


FIGURE 6

Z16-5N

NO

YESZ6-5

R N PE

R N PE

PE

PE PE

FIGURE 4

FIGURE 5

The PE protective conductor may not be interrupted by interrupting devices.

The PE protective conductor may be connected to de-vices that can be opened by means of a tool.

The PE protective conductors must be suitably protected against chemical and mechanical damage and against electrodynamic interference only. The PE protective conductor connections must be acces-sible for inspection and testing of mixed or capped joints.The PE protective conductors must not be fitted with interruption devices (disconnecting switches, automatic switches, relays and contactors , etc.) (fig. 4), but devices that can be opened by means of a tool may be fitted in order to carry out tests.

The ZETApiù series terminals, which can be opened with a screwdriver, can be inserted on PE protective conductors. (fig 5)

E - main EQP equipotential conductorEquipotential conductors are used to connect electric or extraneous conducting parts to the electrical system. In particular, since the equipotential conductors are connected to the main earth node, all the conductors are connected to the earth potential.The main EQP equipotential conductors connect the extra-neous conducting parts in the building (e.g. metal pipelines) to the main earth node.The EQP conductors must have a non-ferrous section that is half that of the highest PE conductor section, with a minimum of 6 mm2. For copper conductors the maximum section is fixed at 25 mm2.

F - Additional EQS equipotential conductor They make local equipotential connections between earth connections or between extraneous conducting parts with the earth system.The EQS connection is provided for in standard CEI 64.8 as protection against indirect contacts in the event of automatic power supply interruption and is mandatory as an improvement for safety purposes as well as automatic interruption of the power supply in areas with the greatest electrical risk, such as swimming pools, rooms containing bathrooms or showers, or rooms used for medical pur-poses. (Standard CEI 64.8 701/710)The EQS conductors that connect two earth connections together must have a section not less than that of the smallest PE protective conductor connected to these earth connections.An EQS conductor connecting an earth connection to a extraneous conducting part must have a section of not less than half the section of the corresponding PE protective conductor (fig. 6).

35

1

3

4 5

6

7

910

11

220 V220 V

12

2

8FIGURE 7

Z35-26D - Z16-12(according to the number of conductors)

13

ADDITIONAL EQUIPOTENTIAL CONNEC-TIONS IN PREMISES USED FOR MEDICAL PURPOSES

The above applies with the exception of group 0 medical practices (rooms for medical use in which electro-med-ical equipment is not used or in which electro-medical equipment with no fitted parts is used) for which an I dn ≤ 30 mA switch is used.

In the case of two or more rooms belonging to the same group, equipotential connections must be provided between them.

The potential equalisation requirements do not apply to extraneous conducting parts or earth connections when they are at a height of > 2.5 m under all operating conditions.

The potential equalisation must be carried out in the manner described below.

In all premises used for medical purposes, where electrical equipment with fitted parts is used, or where there are extraneous conducting parts or earthing con-nections, which may come into contact with the patient,

1 Device permanently inserted on the general distribution system

2 Radiological equipment3 Operating lamp4 Operating table5 Electromedical equipment6 Device with double insulation, without equipotential terminal7 Device protected with PE protective conductor 8 General lighting9 Pipelines of the gas, water, heating system etc.J Insulation resistance monitoring deviceK Insulation transformer with metallic shielding between pri-

mary and secondary and central socket on the secondaryL Metal earthing network, if any, for conductive floorsM Equipotential collector (eg Z35-26D - Z16-12)

an equalisation of the potential created with electrical connections between the earth connections and/or extraneous conducting part accessible in a room or group of rooms must be carried out. (fig 7)(CEI 64-8 710)

36

EXTRANEOUS CONDUCTING

PART

Z16-12

Equipotential connections


FIGURE 9

Medical electrical equipment with its

own earth terminal

Medical electrical equipment powered by a plug socket

Extraneous conducting part

Rdb < 0.15 Ω

Rcb < 0.15 Ω

Rab < 0.15 Ω

a

dc

b

Z35-26D


All the extraneous conducting parts, such as metallic pipes and metal structures of any kind, gas intake columns, central heating systems, must be electrically connected to each other in the room by means of equipotential conductors, which are connected to an equipotential node in the room.

These equipotential conductors must be made of copper with a nominal section of ≥ 6 mm2 .

The resistance of these equipotential bonding conduc-tors, i.e. with direct current, taking into account the contact resistance of the connections, must not exceed 0.15 Ω. (fig. 9)

The equipotential node in the room must be connected to the PE protective conductor.

It is possible to connect extraneous conducting parts to the electrical system in line with each other, for ex-ample gas, water and heating equipment pipelines; the equipotential conductor must connect the connection point of these connections to the room’s equipotential node. (fig. 8)

The following provisions also apply.The following must be visibly connected to the equi-potential node in the room, with the possibility of individual disconnection and permanent accessibility:

– equipotential conductors– PE protective conductors connected directly to the

earth connections– the PE protective conductors connected to the earth

contacts of the plug sockets– any shielding against disrupting electrical fields, in

particular shielding that may be necessary for meas-uring or monitoring equipment installed in operating rooms and in surveillance or intensive care rooms

– the metal earthing network, if any, of semiconductor floors, recommended

for surveillance or intensive care rooms– the metal structures and, where possible, the reinforcing bars of the building– the equipotential terminals of medical electrical equipment. (fig. 9)

The individual conductors connected to the equipo-tential node in the room must be clearly identified by function and origin. .The protection contacts of the plug sockets situated close together can be connected to the same main dis-tributor with a section not less than the highest among the protection conductors connected to the equipoten-tial node in the room.Only one junction or node in the room is permitted between each plug socket and the room’s equipotential node.Electrical devices whose earth connections cannot be connected to the equipotential node in the room (e.g. telephones) must be placed at a minimum distance of 2.5 m from the area surrounding the patient, so that accidental direct or indirect contact by a person in the patient's room with these devices is not possible.

FIGURE 8

37

Z16-12

6 mm²2.5 mm²

2.5

mm

²

2.5

mm

²

6 m

m²

2.5 mm²

16

mm

²

Z16-3

EQS CONNECTION IN DENTAL PRACTICE

A dental practice where dental care is provided without general anaesthesia is a Group 1 practice (Standard 64-8 710).For this type of room, in addition to protection against indirect contacts with automatic power interruption (we

recommend the use of earthing circuit breakers with Idn = 10 mA), the potential equalisation between earth connections and extraneous conducting parts present in the room must be carried out. This type of system is shown below.

FIGURE 10

38

16 mm²

16 mm²

16 mm²

16 mm²

EQS 6

mm

²

Z50-10D

Z16-12

Z16-12

Z16-12

Z16-12

Z16-12

Z16-12

35 mm²35 mm²

16 mm²

16 mm²

EQS CONNECTION IN GROUP 1 AND 2 HOSPI-TAL WARDS (CEI 64-8 710)

In a hospital ward, there are normally hospital rooms, i.e. rooms or groups of rooms in which patients are accom-modated. In the inpatient rooms, normally group 1, an equipotential node must be installed to which the extra-

FIGURE 11

neous conducting parts or earthing connections located in, or which may enter in, the patient area must be con-nected. The installation of the equipotential node is all the more required if these rooms may become group 2 rooms, rooms for medical use in which the parts applied also affect the cardiac area.Only one intermediate node (sub-node) is allowed.

39

Z1

6-1

2

Z1

6-5

N

Z6

-5

Z6

-5

Z6

-5

Z6

-5

Z6

-5

Z6

-5

Z6

-5

Z6

-5

BED

ROOM

BED

ROOM

BATH

ROOM

BATH

ROOM

KIT

CH

EN

LIVIN

G R

OOM

OFF

ICE

BOIL

ER

GAR

AG

E

REI

NFO

RCEM

ENT

CON

NEC

TION

BED

ROOM

EQP

EQS

Earthing system of a 220V residential unit with an elec-tricity supply contract for 6KW + 10%.

EARTHING SYSTEM IN A RESIDENTIAL BUILDING

The diagram shows the entire earthing system with the exception of the additional equipotential connections in the bathroom, which are further detailed below (fig. 14).

FIGURE 12

40

Z35T-11

Z6-5

BED

ROOM

KIT

CH

ENLI

VIN

G R

OOM

LOB

BY

BATH

ROOM

EQS

BED

ROOM

PROTECTIVE CONDUCTOR FROM MAST LINE OR MAIN EARTH NODE OF CONDOMINIUM

Z35T-11

Z35T-11

Other utilities

FIGURE 13

EARTHING SYSTEM IN A RESIDENTIAL BUILDING

Earthing system of a 220 V residential unit with an electricity supply contract for 3 kW + 10%.

The diagrams show the entire earthing system with the exception of the additional equipotential connections in the bathroom, which are further detailed below (fig. 14).

41

~

FIGURE 14

Input

Z6-5

Z1

6-1

2

EQP LINE

HEATING PIPES WATER PIPES

PIPES ENTERING BATHROOMS

In the boiler room, all the extended extraneous conducting parts of a building (pipes) are accessible and it is there-fore easy to make the main equipotential connections. The main EQP equipotential conductors must have a section at least equal to half that of the PE protective conductor with the highest section.

EQP CONNECTION IN BOILER ROOM

EQS CONNECTION IN BATHROOM

All extraneous conducting parts in the room must be connected to the PE protective conductor. In particular, it is sufficient for metal pipes to be con-nected at their entrance into the room.

Equipotential conductors connecting two extraneous conducting parts, or connecting an extraneous conduct-ing part to the protective conductor, must have a section ≥ 2.5 mm2 if mechanical protection is provided and ≥ 4 mm2 if no mechanical protection is provided. (fig.14)

FIGURE 15

42

Z50-10D

Z16-5N

Z16-5NZ6-5

EQP

WAREHOUSE

CONNECTIONS WITH BUILDING REINFORCEMENTS

EARTH SYSTEMSIN INDUSTRIAL BUILDINGS

Below is a diagram of the earthing system of an industrial building directly managed by the distributor (TT system).The earthing network is made up of 5 mm thick galvanised steel profile stakes with a 50 mm transvers diameter, connected by a copper cable, laid underground, with a section of 50 mm2 and an elementary wire diameter of 1.8 mm.

The earthing network is connected to the main earth collector (terminal Z50-10D) with a 50 mm2 copper cable with yellow-green insulation.The PE protective conductors and the EQP main equipo-tential conductor for the entire building start from the main earth collector.

FIGURE 16

43

Z6-3

In = 10 A

6 mm 2

4 mm 24 mm 2

In0 > In1 + In2 + In3 + In4

Iz0 > In0

Iz1> In1 + In2 Iz2> In3 + In4

In1 In2 In3 In4

Z6-3Z6-3

Z6-3

2.5 mm 2

1.5 mm 2

Z6-5

LIGHT AND F.M. DISTRIBUTION SYSTEMSRegulatory references:STANDARD CEI 64-8GUIDELINE CEI 64-50

The ZETApiù series terminals can be used whenever it is necessary to make connections from power and light distribution lines.

If the junctions sections reduce from main line to sec-ondary line(s), the latter must in any case be protected against overloads and short circuits in accordance with the requirements of Standard CEI 64.8.

Overload protection can be omitted in the following cases:

a - wiring located downstream of variations in section, nature, method of installation or formation and ef-fectively protected against overloads by protective devices placed upstream. (fig 17)

b - conduits supplying consumer equipment that cannot generate overload currents provided that the con-duits are protected against short circuits.

Typical examples of devices that cannot be overloaded are:– lighting systems– heating appliances (water heaters, heaters, etc.)– motors with a current, locked rotor, less than the

conduit capacity. (fig 18)

c - Conduits supplying two or more junctions individually protected against overloads, provided that the sum of the nominal currents of the junction protection devices is less than the nominal current of the device protecting the conduit against overloads. (fig 19)

FIGURE 18

FIGURE 19

FIGURE 17

44

CON

NEC

TION

OF

THE

DIS

TRIB

UTO

R U

NIT

OPER

ATI

NG

M

ACH

INE

Z35-6 Z35-6

Z35-6 Z35-6

Z6-3 Z6-3

The following example shows a diagram of a power dis-tribution system in an industrial building. (fig 20)For the distribution, type Z35-6 terminals have been used, which allow the construction of a main line with a 35 mm2section (assuming a cable with PVC insulation, laid in a conduit and a fill factor of 0.8, the maximum capacity of the line is about 100 A) and four spur lines with a 16 mm2 section (maximum capacity of about 60A).

Machinery and industrial sockets with interlocking switches are considered to be equipped with an overload protection device capable of protecting the power supply line with a section of 16 mm2.In order to ensure overload protection of the main line the condition "c" of the previous page must be respected.The main line and secondary line short circuit protection must be provided at the start of the line by means of an automatic circuit breaker.

FIGURE 20

FM DISTRIBUTION SYSTEM FROM MAIN LINE IN COMMERCIAL OR TERTIARY BUILDINGS

45

Z6-3

Z6-5

Z6-5

CON

NEC

TION

OF

THE

DIS

TRIB

UTO

R U

NIT

LIGHTING SYSTEM IN INDUSTRIAL OR TERTIARY BUILDINGS

Below is a diagram of the lighting system of an industrial building. (fig 21)

The power supply lines of the fixtures may not be protected against overloads, the permanent load capacity of the

conduit must be greater than the working current of the fixture and it must be protected against short circuits by a device at the beginning of the line.

FIGURE 21

46

Input

DW

ELLI

NG

PAN

EL

25 A 16 A 10 A 10 A

Idn <30 mA

6 mm 2

25 A

32 A

4 m

m 2

1.5

mm

2

1.5

mm

2

2.5

mm

2

Lighting

User P

> 3.6

KVA

16

A sockets

10

A sockets

Z6-5

Z6-5

Id

ELECTRICAL SYSTEMIN RESIDENTIAL BUILDINGS

The electrical system originates from a measuring unit (meter) placed in a special container accessible to the public even in the absence of the user.Immediately downstream of the measuring unit, a disconnecting device must be provided to ensure pro-tection from the outgoing line against short circuits and overloads.If the power supply to garages, cellars or boiler rooms originates immediately downstream of the delivery point, this power supply line must be protected with its own device, which must also be suitable to ensure adequate protection against indirect contacts (differential magne-tothermic switch with Idn ≤ 30mA).Inside the building, in an easily accessible place, a panel must be provided containing the equipment for disconnect-ing and controlling the power supply lines of the electrical appliances in the entire dwelling.To ensure adequate protection against indirect contact, the main switch or all secondary switches must be equipped with a high-sensitivity differential device (Idn ≤ 30mA).An electrical system of a residential unit must have at least the following lines:– line with 1.5 mm2 section for lighting– line with 1.5 mm2 section for 10A socket outlets– line with 2.5 mm2 section for 16A socket outlets.If there are appliances or other electrical appliances with a unit power greater than 3.6KVA, special circuits must be provided for each of them with a section of at least 4 mm2.

Below is an example of a single wire diagram of the electrical system. (fig 22)

FIGURE 23IN-FLOOR SYSTEM

FIGURE 22

47

ELEC

TRIC

ITY D

ELIV

ERY P

OIN

T

BEDROOM

BATHROOM

OFFICE

KITCHEN

BEDROOM

LIVING ROOM

LOBBY

Z6-5

Z6-5

Z6-5Z6-5

Z6-3

FIGURE 24FM DISTRIBUTION SYSTEM IN CIVIL BUILDINGS

48

Z6-5

Z6-5

BATHROOM

ELEC

TRIC

ITY D

ELIV

ERY P

OIN

T

BEDROOM

BEDROOM

OFFICE

KITCHEN

LIVING ROOM

LIGHTING SYSTEM IN CIVIL BUILDINGS FIGURE 25

APPENDIX A:Definitions of the terms used(from Standard CEI 64-8)

Earth ConnectionA conductive part of an electrical component that can be touched and is not usually live, but may be live if there is a fault. A conductive part that can only be energized when in contact with an earth connection, is not to be considered an earth connection.

Extraneous conducting partConducting part that is not part of the electrical system capable of introducing a voltage.

Live partLive conductor or part of conductor in ordinary operation, including neutral conductor.

Indirect contactContact of persons with a live earth connection due to a fault.

Direct contactContact of persons with live parts

Earthing systemA set of earth electrodes, earth conductors, earth collectors (or nodes) and protection and equipotential bonding conductors, designed to provide protection and/or operating earthing.

Earth resistanceResistance between the main earth collector and the earth.

User systemIt consists of the power supply circuits of operating units and the plug socket, including the necessary control, disconnection, protection, etc. equipment.

Operating current (of a circuit)Current that may flow in a circuit during normal operation.

Capacity (stationary wiring)Maximum value of the current that may flow in sta-tionary wiring and under certain conditions, without its temperature exceeding a specified value.

OvercurrentAny current that exceeds the nominal value. For cables, the nominal value is the capacity.

Overload currentOvercurrent that occurs in a sound electrical circuit.

Short-circuit currentOvercurrent that occurs as a result of a negligible impedance fault between two points, between which there is normal operating voltage.

WiringA set consisting of one or more electrical conductors and the elements ensuring their insulation, support, fastening and any necessary protection.

SYMBOLS

underground line

overhead line

conduit or duct

wall wiring

wiring in recessed protective tube

wiring in cable run or gangway

wiring in protected bar

connection box

distribution panel

transformer

live energy meter

earthing

readily serviceable cable pit with earthing

earth connection frame

button

secure access button with glass cover

alarm

socket with contact for protective conductor

safety socket with contact for protective conductor

socket with interlocking switch and fuse

socket

fuse

path/step marker light diffuser

bathroom shower help call

time switch

socket antenna, frequency mod., TV socket

telephone, wired socket, telephone socket

intercom

video intercom

electric lock

single-pole switch

single-pole switch with indicator lamp

two-pole switch

single-pole deviator

single-pole deviator with indicator light

inverter

light intensity adjuster

automatic magnetothermic switch

differential automatic magnetothermic switch

room thermostat

light point

wall light point

incandescent lamp

self-contained emergency lighting unit

lighting fixture for fluorescent lamps

direction indicator lamp

w w w. c e m b r e . c o . u k

Any other country, please contact Cembre S.p.A. - Italy

Dunton ParkKingsbury Road, CurdworthSutton Coldfield - West Midlands B76 9EB UKTel.: 01675 470440Fax: 01675 470220 E-mail: [email protected]: www.cembre.co.uk

Design, manufacture and sales of elec-trical connectors and associated tools, cable accessories, marking systems, tool-ings and products for railway applica-tions. Tools for pressed joints for water, gas, steam, waste and HVAC and related accessories. In house repair, refurbish-ment and calibration of toolings.

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indirect clamping terminal blocks · 2019-09-02 · 1 connection capacity the "connection...

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