Consumer Unit Guide

Specification and InstallationRecommendations to the Wiring Regulations BS 7671

In an increasingly safety conscioussociety the safety critical elements ofa home’s electrical installation; theconsumer unit and its protectivedevices, are becoming moreimportant to the specifier.

After all it is often an electrically unqualifiedperson, the homeowner or tenant, who hasaccess for operation and is thereforepotentially most at risk from a non compliantproduct or installation.

In addition we are living in an increasinglyelectronic age where electricity consumptionis on the increase, so the consumer unit hasto function at more demanding levels thanever before and this trend for more power islikely to continue.

As a result the modern consumer unit typicallycontains many advanced circuit protectiondevices such as overcurrent and earth faultdevices. New levels of functionality in thedomestic installation are also being realisedthrough the addition of more control productssuch as time clocks, bell transformers andeven surge protection devices.

Clearly the role of the specifier andcontractor in selecting consumer units andtheir protective devices to comply with thechanging requirements of the wiringregulations is becoming increasingly difficult.

About this guideThis guide helps you consider the necessary criteria needed to select the most appropriate consumer unit for yourapplication, while taking the requirements of the wiring regulations into account.

You may well specify or install suchproducts regularly, and no doubt you willalready know much of the content, butequally there may be some areas that youfeel are worth revisiting – perhaps TTinstallations for instance.

changing times

Contents:Independent third party approval ..................................................................3About consumer units ......................................................................................4Supply earthing systems ..................................................................................5Selecting a consumer unit ..............................................................................7Division of circuits ..........................................................................................10Circuit protection devices ..............................................................................12SPSN consumer units ....................................................................................13Summary of the regulations ..........................................................................14

Most consumer unit manufacturers have noindependent verification that their productscomply fully with British and Europeanstandards.

So in the face of cheap imports and stiffprice competition, how can you beconfident that the consumer units you areselecting do not compromise on safety?

Remember product standards are there toprovide a defined level of performance andsafety, see regulation 511-01-01 above.

Hager is one of only two manufacturers whohave taken the safety orientated stance ofgetting full independant approval for theirconsumer units. As proof look for the ASTA diamond mark on the product.

independent approvalAbout ASTAAs the industry’s accredited independenttesting and certification organisation, ASTAtest and certify electrical products to British,European and International standards.There is, however, more than one level oftesting and certification, see below:

Type testingOne or more elements of the BritishStandard are tested for e.g. short circuittesting.

Complete compliance testingThe product is tested for full complianceagainst the product standard.

Full ASTA approvalThis is an ongoing guarantee from ASTA that the product meets and continues tomeet the specified British and International standards.

This is achieved by:

• complete compliance testing of allproduct variants to be marked

• verification of consistent manufacturingmethods to ISO 9001/9002

• verification of quality procedures

For the ongoing assurance that theDiamond Mark gives ASTA will then:

• complete an annual retest of a randomlyselected sample off the production line.

• ratify proposed changes in production ordesign and retest if appropriate.

• repeat full compliance testing after 7years.

511-01-01 Every item of equipment shallcomply with the relevant requirements ofthe applicable British Standards, orHarmonised Standard appropriate to theintended use of the equipment.

“Remember only the ASTA Diamond Mark gives you the ongoingconfidence to specify an independently endorsed safe product.”

A consumer unit should bedesigned, manufactured and tested to the European harmonizedstandard BS EN 60439-3 titled Low-voltage switchgear and control gear assemblies.

Part 3 details the particular requirements for assemblies intended to be installedwhere unskilled persons have access totheir use – Distribution boards.

Annex ZA to BS EN 60439-3 is where weget specific mention of what we typicallycall a consumer unit.

This annex states that the co-ordinatedassembly that is a consumer unit must passa stringent short circuit test, see right.

As it is designed to be a co-ordinatedassembly product testing will always becompleted using the manufacturer’s ownprotective devices within the consumer unit.

Don’t mix and matchFitting a consumer unit made by onemanufacturer with MCBs and RCCBs fromanother would make any certification nulland void and difficult to prove compliancewith the wiring regulations. Responsibilityfor compliance with the regulations wouldthen rest with the specifier and the installer.

A consumer unit made from loose, non co-ordinated components, generally assembledon site, would be called a Partially TypeTested Assembly (PTTA) and is not likely tobe subjected to the same rigorous testing.

As consumer units and the associatedprotective devices are familiar to us, theirselection tends to be based on historicparameters. However, the increasing use of more sophisticated boards in the form of split-load configurations, in all its guises, and the ever changing wiringregulations gives us reason to revisit the selection process.

what is a consumer unit?

Source of 16kA fault

0.6m oftwin cableHouse

servicecut-out

Consumer unit(metalclad if one

is available)100A fuse-link complyingwith type II of

BS 1361: 1971

16mm2 Cu cable

Deviceunder test

Annex ZA of BSEN439-3 ‘Customer Distribution Board: An integrated assembly, for thecontrol and distribution of electrical energy, principally in household or similar premises,incorporating manual means of double pole isolation on the incoming circuit(s), withpolarity observed thoughout. They are designed for the use exclusively with specificprotective devices on the outgoing circuits, and type-tested for use when energisedthrough the specified 100A fuse. NOTE: Generally known as a Consumer unit.’

The purpose of which is to safely control and distribute electricity in domestic (household)applications or in other places where unskilled persons have access to their use.

The earthing arrangement providedby the Public Electricity Supplier isone of the primary factors affectingconsumer unit selection. Here wereview the most common systemsused in the UK, before looking at theaffect they may have on productselection.

Before doing so it is worth remindingourselves of the basic formulae used toensure disconnection times are met forcircuits feeding both fixed and portableequipment.

From the equation Zs = Ze + (R1 + R2) wecan see that Ze has a big impact on thephase-earth fault loop impedance.

To achieve the required disconnection timessufficient current must flow through theprotective device.

Fault current = Open Circuit Voltage (240V)Earth Fault Loop Impedance

Therefore a low value of Ze will contribute toan overall low Zs value. This gives arelatively high fault current. This can then

be used to determine the disconnectiontime of the protection device.

TN-C-S (PME) – see figure 1This is probably the most common form ofsupplier earthing. It combines the neutraland earth fault path from the supplytransformer to the installation in oneconductor – called the Protective Earth andNeutral conductor, or PEN for short.

However, loss of the PEN conductor couldlead to 230V appearing on earthed metalwork in the installation under faultconditions. To minimise this risk, the PENconductor is staked to the ground at regularintervals, hence the term Protective MultipleEarth (PME). This means that if the PENconductor goes open circuit along itslength, there is still a fault current path backto the supply transformer via a short run ofground.

Generally the maximum external earth faultloop impedance of the TN-C-S system isquoted as 0.35Ω.

Figure 1

supply earthing systems

0056467

Meter

ServiceCut-out PME Earthing

Conductor

Main Earthing Terminal

Equipotential Bonding

Conductors

Safety Earth ConnectionDO NOT REMOVE

Neutral LinkConnection Block

GasWater

R1

R2

Z

N

PE

L1consumer’sterminals

source ofenergy

loadterminals

e

TN-S – see figure 2The supply transformer arrangement is thesame as in the TN-C-S system. However,the neutral and earth are separateconductors both to and in the installation.Public Electricity Suppliers (PES’s formerlythe REC’s) typically give the maximum Ze fora TN-S system as 0.8Ω.

Figure 2

TT – see figure 3Generally used in rural areas, the TT systemuses the ground as the earth fault returnpath rather than a dedicated conductor.The supply transformer neutral is yet againearthed, however in this system theinstallation’s exposed metal work isconnected to earth via an earthingelectrode.

Due to the soils varying mineral and watercontent and its affect on resistivity, the earthfault loop impedance for such systems varieswidely from a few Ohms to several hundredOhms. As such this arrangement normallyneeds special consideration when selectingdistribution and protection products.

Note: “The IEE OnSite Guide”,states thatanything over200Ω for RA ina TT system istoo unstable andnotrecommended.

The advantage of aTT system for thePES is cost saving asno earth conductor isrun to remote sites. Youshould note, however,that some PES’s have hadan on-going project to PME their overheadsupplies. As such PME is available insome remote areas.

As stated earlier the type of supplyearthing used has a big influence indetermining the configuration of consumerunit selected – see pages 7-9 for guidance.

Figure 3

supply earthing systems continued

0056467

Meter

ServiceCut-out

Earthing Conductor

Main Earthing Terminal

GasWater

Equipotential BondingConductors

Safety Earth ConnectionDO NOT REMOVE

Safety Earth ConnectionDO NOT REMOVE

0056467

Meter

ServiceCut-out

EarthElectrode

Earthing Conductor

Main Earthing Terminal

GasWater

Equipotential BondingConductors

Residual CurrentDevices

Safety Earth ConnectionDO NOT REMOVE

For installations with TN-C-S andTN-S earthing systems the Zs isgenerally of a low enough value thatthe required disconnection times of5s and 0.4s are achievable using anovercurrent protective device.

Consumer Units in TT installationA TT installation, however, can be a differentmatter therefore we will consider this first.With a typical external earth fault loopimpedance of 40Ω, a maximum earth faultcurrent of 240/40 = 6A will flow. This meansthat even a 6A MCB will not operate withinthe stated disconnection times. A commonsolution is to use an RCCB as an incomer.

So it is likely that, on a TT installation, youwill need an RCCB controlled consumerunit. But how do you decide whichsensitivity? Please remember that an RCCBas an incomer in this instance is being usedto achieve disconnection time, not to offerprotection against direct contact.

Reg. 413-02-20 gives the equation tocalculate maximum sensitivity.

This equation states that the sum of theresistance of the earth electrode and allprotective conductors connecting it toexposed conductive parts, multiplied by thecurrent causing effective operation of thedevice (sensitivity of RCD) is not allowed toexceed 50V. The requirement is intended tolimit the touch voltage to 50V or for higherfault currents to values within the touchvoltage curve. For normal installations 50Vis considered a safe touch voltage.

Reading regulation 471-16-01 (above) it is tempting to specify a 30mA incomingRCCB to offer blanket earth fault protectionto the installation, while also satisfying theneed for compliant disconnection times.Resist this temptation. Avoidance of danger and minimising inconvenience as inReg. 314-01-01 (see page 10), is not bestserved by an incoming earth fault devicesince a fault on any circuit will cause theloss of power to all circuits.

Three solutionsThis is why the On Site Guide (OSG) statesthat an RCCB incomer should not be lessthan 100mA. There are 3 main solutions tothe above dilemma each with its ownmerits. Two of these are shown in the OnSite Guide.

a) Switch disconnector incomer and RCBOson all circuits (figure 4).

Figure 4

selecting a consumer unit

413-02-20 The following condition shallbe fulfilled for each circuit:

RA Ia ≤ 50 V

Reg. 471-16-01 A socket-outlet ratedat 32 A or less which may reasonablybe expected to supply portableequipment for use outdoors shall beprovided with supplementary protectionto reduce the risk associated with directcontact by means of a residual currentdevice having the characteristicsspecified in Regulation 412-06-02(ii)

AD1108100N

8100N

8100N

AD110 AD110 AD110 AD110

1 ON

SB 299

1 ON

selecting a consumer unit continued

This is the best solution since under faultconditions only the affected RCBO will trip.However, for many applications this mayprove too expensive.

b) Split-load time delayed board. A 100mAtime delayed RCCB (selective-S type)feeds both a number of low risk circuits(lights etc) and also feeds a 30mA non-time delayed RCCB feeding the high riskcircuits. (Fig. 5 and 6)

Figure 5

This solution helps provide continuity ofsupply by ensuring that for the mostcommon faults i.e. those on the high riskcircuits, only the 30mA RCD trips. The timedelayed RCD does not trip with the 30 mAdevice ensuring compliance with reg 531-02-09 (see below).

Figure 6

Note: Faults on the 100mA protectedcircuits will cause loss of supply to thewhole board.

Twin RCCB Board c) Switch disconnector with parallel fed

30mA and 100mA RCCBs (Fig. 7)

Figure 7

This is perhaps the best cost effectivesolution, as irrespective of fault locationonly the affected RCCB will operate.

531-02-09 Where, for compliance withthe requirements of the Regulations forprotection against indirect contact orotherwise to prevent danger, two ormore residual current devices are inseries, and where discrimination in theiroperation is necessary to preventdanger, the characteristics of thedevices shall be such that the intendeddiscrimination is achieved.

hager hager hager

50299

30mARCCB

100mARCCB

OverallMain

Switch

40ms

100mA ’S’ type device

100mA type device

30mA type device

130ms 300ms 500ms

Earth fault 150mA

Downstream 30mA

Upstream 100mA

Tripping Time

hager hager

CN28 U

30mARCCB

100mATime Delayed

RCCB

In TT installations the construction of theenclosure is also important and shouldpreferably be of an all insulated or Class iiconstruction. If a metallic enclosure isnecessary then precautions in the form ofinsulated bushes and additional support forthe incoming tails is required. Thisminimises the chance of an earth faultoccurring on the supply side of the RCCB,which won’t be detected and cleared bythat device.

Consumer units in TN-C-S and TN-Sinstallations – see figure 8With these earthing systems offering lowexternal earth fault loop impedance, themajority of installations will not need anRCCB as an incomer. This helps minimiseinconvenience, a key objective of the WiringRegulations. Generally the use of split loadconsumer units is a good solution for TN-C-S and TN-S installations.

Figure 8

Refer to page 10 for details of which circuitshould be fed from the switch disconnectorand which from the RCCB.

An alternative to a standard split load wouldbe the same as Fig. 5 (split load timedelayed), with the 100mA device offeringexcellent general and fire protection (wellworth considering on properties withincreased fire risk such as thatchedproperties).

hager hager

30mARCCB

MainSwitch

SB299

It is impossible to give a hard and fast ruleto meet the regulations since eachinstallation and its use will be different. Inpractice the engineer’s experience andconsultation with the end user willdetermine the outcome.

The number of final circuits plus anallowance for future expansion willdetermine the number of outgoing wayschosen.

So, first let’s list down the typical circuitsthat might exist in a domestic property andindicate whether or not they should be RCDprotected on a split load board. While notexhaustive, the list does give us a soundbase to work from:-

division of circuits

Probable circuits RCD protection?Downstairs ring final circuit Yes

Upstairs ring final circuit Not required to regulations

Kitchen ring final circuit Dependant on consideration of accessible outlets

Utility ring final circuit Dependant on consideration of accessible outlets

Downstairs lighting circuit No

Upstairs lighting circuit No

Smoke detector circuit No

Immersion heater Not required to regulations

Cooker Not required to regulations

Fridge or fridge/freezer No - if dedicated circuit

Garage sub distribution circuit Yes

Shed sub distribution circuit Yes

Workshop sub distribution circuit Yes

Alarm circuits No (if unavoidable an RCD should be dedicated to this circuit and be no more sensitive than 100mA)

External lighting Dependant on whether Class I or II

Electric shower circuit Yes (manufacturer’s recommendations)

Ring final circuit for home office (depends on location within property)

314-01-01 Every installation shall bedivided into circuits as necessary to:

i) avoid danger and minimizeinconvenience in the event of a fault, and

ii) facilitate safe operation, inspection,testing and maintenance.

Obviously not all of these have to beseparate circuits. A burglar alarm can befed off the ring final circuits for sockets via afused connection unit with exterior lightingcommonly fed from an interior lightingcircuit, for example. Thought must, however,be given to the number and type of circuits.

In a typical installation there might be sevento eight separate circuits with provision forfour future additions.

TO RCD OR NOT TO RCD?

Exactly which circuits should be given earthfault protection and which shouldn’t is alwaysopen to debate. The table on page 10opposite summarises our recommendations.Here we deal with just the socket outletcircuits.

Reg. 471-16-01 (see page 7) requires anysocket outlet rated at 32A or less that canreasonably be expected to feed portableequipment outdoors is protected with an RCDthat has a sensitivity of not more than 30mA.

In a typical two-storey house this couldinclude all downstairs socket outlets,including accessible outlets in kitchens,

outbuildings and garages. Earth faultprotection for upstairs sockets is debatableand generally would not be needed.

Ground floor flats, on the other hand, shouldhave all their sockets protected, but thinkhard before providing RCD protection for flatson the first floor and above.

Avoiding nuisance trippingSelecting the current carrying capacity for anRCCB is simple enough based on circuitdesign current; but choosing the rightsensitivity is more difficult. Feedinginappropriate equipment can often causenuisance tripping.

Regulation 607-02-03 states that any RCDmust not have standing earth leakage of morethan 25% of its sensitivity placed on it. Thisregulation applies to one item of stationaryequipment, but it makes good sense to applyit to other circuits in order to avoid nuisancetripping. For a 30mA RCD this means anystanding earth leakage current (not earth fault)greater than 7.5mA is unacceptable.

With a typical house having personalcomputers, DVD players, TVs, Hi-Fis,microwaves, electric showers and fridgefreezers, (which can all have earth leakage)care must be taken to avoid this commonpitfall. Division of ring final circuits is a goodway of avoiding this problem, particularly ifthe property has a home office set up with a corresponding increase in electronicequipment.

607-02-03 Where more than one itemof stationary equipment having an earthleakage current exceeding 3.5 mA innormal service is to be supplied from aninstallation incorporating a residualcurrent device, it shall be verified thatthe total leakage current does notexceed 25% of the nominal trippingcurrent of the residual current device(see also Regulation 531-02-04)

So far we have looked at the mostappropriate consumer unit for aparticular installation.

Here we briefly consider the outgoingprotective devices. These could be BS1361fuse carriers, miniature circuit breakers(MCBs), or residual current circuit breakerswith integral overcurrent protection (RCBOs).

Whilst it is beyond the scope of this bookletto detail the full criteria for selecting a device,it is still worth making a few points.

Historically, B-curvebreakers are used indomestic environments.

For lighting circuits,however, it is wise toconsider a C curve MCBnot just for the inrush on Extra Low Voltagelighting but also to minimise the chance of theMCB tripping when a single lamp blows(increasingly common).

Compliance with the BS7671: 1992 withregard to cable protection and disconnectiontimes etc must still be obtained if using CCurve MCBs

The modern home has a huge amount ofexpensive electronic equipment. However littleconsideration is given to how increasinglyfrequent overvoltages can affect thisequipment. It is likely that the next rewrite ofthe regulations will address this issue.

Consider surge protectionA surge protection device (SPD) protectsequipment from such transient overvoltagesand is easily incorporated into standardconsumer unit configurations. This ensures thatthe whole installation is protected at source, i.e.at the consumer unit (see figure 9), as opposedto the common use of protective trailing leads,which only protect a couple of loads.

Typically these short time disturbances on thesupply will be generated either byatmospheric discharges (lightning) or morelikely by inductive equipment being switchedon and off. These overvoltages can beseveral thousands of volts and can causeanything from data loss in a PC to completedestruction of equipment.

Most domestic installations would only needa single SPD to provide a high level ofprotection from these transients and ensure

the integrity of theincreasing array ofdomestic appliances. Thisis particularly true with thegrowing predominance ofhome working (SmallOffice Home Office, orSOHO applications)

For advice about SPDselection telephoneour technical hotlineon 0870 607 6677.

circuit protective devices

Figure 9

Surge ProtectionDevice

These consumer units haveparticular benefits for localauthorities and housingassociations. Unlike conventionalconsumer units, where only thephase is switched on outgoingcircuits, SPSN MCBs allow both thephase and neutral to be switched(yet the MCB width is maintained inone module) figure 11. This offershigher levels of safety due to thedouble pole (total) isolation.

They have several distinct advantages1. They disconnect neutral to earth faults as

well as phase to earth faults. Typicallyneutral to earth faults have low levels offault current flowing and do not trip thecircuit overcurrent protective device i.e.the MCB or fuse. However it will trip themain RCD (if fitted), which detects andreacts to these small faults – leavingseveral circuits unnecessarily withoutelectricity.

By turning off all the SPSN MCBs thetenant or homeowner can usually switchthe main RCD back on. Then by turning

on the MCBs one at a time, until the RCDtrips, they can identify which circuit thefault is on and just leave that one off.

By talking the homeowner or tenantthrough the above procedure anemergency call out can often be turnedinto a planned call the next day, thussaving money and inconvenience for thetenant.

2. By identifying which circuit the faultoccurred on, it makes subsequent faultfinding easier.

3. Easier, quicker and neaterwiring simplifies circuitidentification.

Note: All of the aboveshould be viewed inconjunction with theearthing system selectioncriteria (see pages 5-6).

single pole and switched neutral(SPSN) consumer units

Figure 11

Figure 10

Phase and NeutralBusbar

regulations for installing a consumer unit

Cables adequatelyclipped (526-01-01)

Protective conductors (earthing and bonding)sized in accordance with chapter 54

Unit adequatelyfixed (412-03-03)

Enclosure sealedto IP2X ie blanksfitted (412-03-01)

Enclosure materialappropriate to theenvironment (522-06-01)

Appropriate labels provided(514-12-01 & 514-12-02)

Sufficient space to allowcables to bend intodevices (522-08-03)

Cable sheaths notstripped outside ofenclosure (526-03-03)and grommets usedwhere appropriate(522-08-01)

Cable entry sealedto IP4X (412-03-02)

Circuits must be sub-divided (314-01-02), separated (314-01-04),protected by appropriate devices (433-02-01) and identifiable toprotective device (514-08-01)

Diagrams must beprovided (514-09-01)

YC0512

General requirements Regulation

• Complies with the relevant requirements of the applicable 511-01-01British Standard or harmonised Standard

• Manufacturer’s instructions are followed, or the unit would have to be 713-05classified as Partially Type Tested Assembly (PTTA)

• The protective devices in the Consumer Unit are adequate for the 313-01-01prospective fault level (conditional rating?) 512-02-01 (ii)

• The rating of the main switch or circuit breaker is sufficient for the 512-02-01 (i)likely electrical load

• The tails between the Consumer Unit and the meter, or REC’s isolating 523-01-01switch, are adequately sized and protected against mechanical damage 522-06-01

522-08-01(433-02-01)

• Minimum bending radius for cables not exceeded 522-05-03

• Installation divided into circuits to avoid danger and minimise inconvenience in 314-01-01the event of a fault

• Supplementary protection of socket-outlets which may reasonably be expected 471-16-01to supply portable equipment for use outdoors (30mA RCD)

• Where an rcd is installed at the main switch position, and the installation is part of 531-04-01a TT system, the tails are adequately protected against the possibility of earth faultwhere they enter a metal-clad Consumer Unit

• The Consumer Unit is installed in a readily accessible position 513-01-01

• The earthing conductor is of adequate cross-sectional area 543-01-01

• The polarity of the connections to the main switch is correct 530-01-02713-09-01

• The phase and neutral conductors are taken into the Consumer unit 521-02-01through a common entry in a metal-clad Consumer Unit

• Final circuit cables adjacent to the Unit are adequately protected 522-06-01against the risk of mechanical damage in use 522-08-01

• Circuit cables entering the Consumer Unit are not at risk from abrasion, etc 522-08-01

• The Consumer Unit is adequately secured in position 130-01-01

• Conductor terminations are properly secure (tight) within their terminals 526-01-01

• The unsheathed cores of conductors are fully contained within the consumer unit 526-03-03

• 2-core ‘bell wire’ segregated from the cables of low voltage (240V) circuits. Bell wire 528-01-02should not be run in the same conduit, ducting, trunking or even holes drilledthough joists as cables of other circuits

• Where the sheath of twin and cpc cable has been removed the bare circuit protective 543-03-02conductor is sleeved in green/yellow insulating material

• Neutral and protective conductors are connected in the same sequence as the 314-01-04phase conductors

• Circuits are correctly and easily identified 514-08-01

• Terminations and joints of cables are enclosed in a suitable enclosure 422-01-04

526-03-0

• Unused holes (ways) on the Consumer Unit are blanked off 522-04-01

(412-03-01)

• Rating of the protective device is not greater than the current carrying capacity of 433-02-01the installed circuit conductor

• Live parts shall be inside enclosures or behind barriers providing at least the degree 412-03-01of protection IP2X or IPXXB

• The horizontal top surface of a barrier or an enclosure which is readily accessible 412-03-02shall provide a degree of protection of at least IP4X

• Correct Labels, Periodic inspection, RCD, Isolation, Equipment vulnerable to 514-12-01testing, Main switch 514-12-02

461-01-05514-11-01514-09-01514-09-01514-01-01(514-08-01)

• A legible diagram, chart or table or equivalent form of information shall be provided 514-09-01

• Earthing Requirements For The Installation Of Equipment Having High Earth Leakage 607-01Currents, individual items of equipment where the earth leakage current exceeds3.5mA/final circuits where the accumulated earth leakage is expected to exceed 10mA

• Electrical Connections, Durable electrical continuity, Adequate mechanical strength 526-01-01and connection, Suitable for the conductor csa and shape and the number of 526-01-01conductor strands, capable of accepting all conductors without modification of the 526-02-01conductors (no cutting out strands)

Hager LtdHortonwood 50TelfordShropshireTF1 7FT

NATIONAL SALES HOTLINE0870 240 2400

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E-MAILinfo@hager.co.uk

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