cable trays technical instructions · pdf filespace in the cable tray for possible additional...

C a b l e T r a y sC a b l e T r a y s

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Products Catalogue Objective and Structure

The company’s main objective is the supply of quality products, with respect to:

• practical design

• increased durability

• easy and quick installation

• reasonable cost

• minimum delivery time

At the same time, the correct design and selection of the cable tray system is critical for the optimumperformance of the system, both in technical and economical terms. For that reason, this catalogue isalso a guide to the best selection and use of cable support products. This way, each project’s specifi-cations will be fully met with a system of minimum purchase, installation and maintenance costs.

The first few pages provide some basic technical instructions for the correct selection of:

• corrosion resistance

• cable tray support type

• dimensions of supports and cable trays

• material thickness and distance between supports

By following the instructions and the detailed product description of each product, engineers can easilyselect the correct item for each application.

George KoundourakisGeneral Manager

GUARANTEE

METALLODOMI S.A. covers with limited guarantee of twe (2) years from the day of purchase for all theproducts manufactured Hot Dip Galvanized According to DIN EN ISO 1461.

TECHNICAL INSTRUCTIONS

Our products are classified according to their corrosion resistance level as follows:

1. Products made of pre-galvanized sheet metal.Method: The sheet metal is dipped in zinc bath at 450οC according to the EN ISO 10142 standard.The resulting zinc layer has an average thickness of 20μm. The next step is punching and bendingof the metal sheet.The surfaces resulting from cutting and punching are also protected against corrosion (up to 2mmof sheet thickness) due to the formation of zinc oxide.Use: Dry-air, indoor applications.

2. Products made of mild steel sheet and then hot-dip galvanized.Method: The mild steel sheet is punched and formed. The next step is hot-dip galvanizingaccording to the EN ISO 1461 standard. The resulting zinc thickness is about 60 μm. Use: Indoor applications with high moisture or outdoor applications.

3. Products made of stainless steel.Method: Stainless steel sheet is punched and formed. Use: Special applications, food or chemical industries and seaside installlations.

Additional types of corrosion resistance can also be applied and offered:

• Products made of raw steel sheet, electro-galvanized

• Products made of mild steel sheet, hot-dip galvanized and epoxy powder coated.

4. Life spanThe life span of a zinc-coated material cannot be accurately predicted. However, it can be roughlyestimated according to environmental conditions:

Corrosion Resistance Selection

Expected life metalExpected life metal (in years)

Environment: Pre-galvanized Hot-dip galvanized

CountrysideCountryside: 6 – 13 15 – 50

CoastalCoastal: 2 – 8 5 – 20

UrbanUrban: 4 – 20 10 – 35

IndustrialIndustrial: 1 – 6 3 – 13


Selection of dimensions:

The basic criterion for selecting the suitable cable support system is the type and cross-section of thecables. For example, large cross-section cables which are energy carriers release significant quantitiesof heat, therefore they need to be routed using cable ladders in order to enable the air flow around thecables.Telephone, network, signal cables or even low power cables can be routed through cable trays.

When the cross section and the number of cables to be routed are known, the suitable cable tray crosssection can be estimated.The suggested selection process is the following:

1. The sum of cable cross sections is calculated.

2. The result is multiplied by a factor of 1.3 to take into account the random placement of thecables into the cable tray.

3. The new result is multiplied again with a minimum factor of 1.3 to consider some extra free space in the cable tray for possible additional cables to be routed through the cable tray in the future.

4. The cable tray cross section (width x height) that will be selected must be equal to or greaterthan the result of the above mentioned calculations.

In order to facilitate calculations, the following table contains the dimensions of the most commonlyused cables. It must be noted however that the values in the table are approximate. The respectivetables of the cable manufacturer should be used for better results.

Selection of Cable Support System

Single-thread Power Cables

TECHNICAL INSTRUCTIONS Diameters and Cross Sections of commonly used Cables

Signal Cables

Type Diameter Cross section(mm) (cm2)

2 x 2 x 0,6 5 0,204 x 2 x 0,6 5,5 0,246 x 2 x 0,6 6,5 0,33

10 x 2 x 0,6 7,5 0,4420 x 2 x 0,6 9 0,6440 x 2 x 6,6 11 0,9560 x 2 x 0,6 13 1,33

100 x 2 x 0,6 17 2,27200 x 2 x 0,6 23 4,15

2 x 2 x 0,8 6 0,284 x 2 x 0,8 7 0,386 x 2 x 0,8 8,5 0,57

10 x 2 x 0,8 9,5 0,7120 x 2 x 0,8 13 1,3340 x 2 x 0,8 16,5 2,1460 x 2 x 0,8 20 3,14

100 x 2 x 0,8 25,5 5,11200 x 2 x 0,8 32 8,04


1 x 10 10.5 0,871 x 16 11,5 1,041 x 25 12,5 1,231 x 35 13,5 1,431 x 50 15,5 1,891 x 70 16,5 2,141 x 95 18,5 2,69

1 x 120 20,5 3,301 x 150 22,5 3,981 x 185 25 4,911 x 240 28 6,161 x 300 30 7,073 x 1,5 11,5 1,043 x 2,5 12,5 1,233 x 10 17,5 2,413 x 16 19,5 2,993 x 50 26 5,313 x 70 30 7,07

3 x 120 36 10,184 x 1,5 12,5 1,234 x 2,5 13,5 1,434 x 6 16,5 2,14

4 x 10 18,5 2,694 x 16 21,5 3,634 x 25 25,5 5,114 x 35 28 6,164 x 50 30 7,074 x 70 34 9,084 x 95 39 11,95

4 x 120 42 13,854 x 150 47 17,354 x 185 52 21,244 x 240 58 26,425 x 1,5 13,5 1,435 x 2,5 14,5 1,655 x 6 18,5 2,69

5 x 10 20,5 3,305 x 16 22,5 3,985 x 25 27,5 5,945 x 35 34 9,085 x 50 40 12,57

Multi-thread Power Cables


1 x 4 6,5 0,331 x 6 7 0,381 x 10 8 0,501 x 16 9,5 0,711 x 25 12,5 1,233 x 1,5 8,5 0,573 x 2,5 9,5 0,713 x 4 11 0,95

4 x 1,5 9 0,644 x 2,5 10,5 0,874 x 4 12,5 1,234 x 6 13,5 1,434 x 10 16,5 2,144 x 16 19 2,844 x 25 23,5 4,344 x 35 26 5,315 x 1,5 9,5 0,715 x 2,5 11 0,955 x 4 13,5 1,435 x 6 14,5 1,655 x 10 18 2,545 x 16 21,5 3,635 x 25 26 5,317 x 1,5 10,5 0,877 x 2,5 13 1,33

Cable Weight Tables TECHNICAL INSTRUCTIONS

Cable weight calculation:In order to proceed with the selection of cable supportsystem, the total cable weight per meter length must becalculated first.For this calculation, cable weights can be found in tablesprovided by cable manufacturers.Such a table is provided below.

Signal Cables

Type Weight(kg/m)

2 x 2 x 0,6 0,034 x 2 x 0,6 0,0356 x 2 x 0,6 0,0510 x 2 x 0,6 0,06520 x 2 x 0,6 0,1140 x 2 x 0,6 0,260 x 2 x 0,6 0,275

100 x 2 x 0,6 0,445200 x 2 x 0,6 0,87

2 x 2 x 0,8 0,044 x 2 x 0,8 0,0556 x 2 x 0,8 0,0810 x 2 x 0,8 0,115 20 x 2 x 0,8 0,20540 x 2 x 0,8 0,3860 x 2 x 0,8 0,54

100 x 2 x 0,8 0,875200 x 2 x 0,8 1,79

Multi-thread Power Cables

Type Weight(kg/m)

1 x 4 0,081 x 6 0,1051 x 10 0,1551 x 16 0,231 x 25 0,333 x 1,5 0,1353 x 2,5 0,193 x 4 0,265

4 x 1,5 0,164 x 2,5 0,234 x 4 0,334 x 6 0,464 x 10 0,694 x 25 1,644 x 35 2,095 x 1 0,19

5 x 2,5 0,275 x 4 0,415 x 6 0,545 x 10 0,855 x 16 1,355 x 25 1,997 x 1,5 0,2357 x 2,5 0,35

Single-thread Power Cables

Type Weight(kg/m)

1 x 10 0,181 x 16 0,241 x 25 0,351 x 35 0,461 x 50 0,61 x 70 0,81 x 95 1,11 x 120 1,351 x 150 1,651 x 300 3,23 x 1,5 0,193 x 2,5 0,243 x 10 0,583 x 16 0,813 x 50 1,83 x 70 2,43 x 120 44 x 1,5 0,224 x 2,5 0,294 x 6 0,44 x 16 1,054 x 25 1,64 x 35 1,754 x 50 2,34 x 70 3,14 x 95 4,24 x 120 5,24 x 150 6,44 x 185 8,054 x 240 115 x 1,5 0,275 x 2,5 0,355 x 6 0,615 x 10 0,885 x 16 1,255 x 25 1,955 x 50 3,5

COMMENTS

CABLE LADDERS

Cable ladders are the most common solution for supporting and routing of cables in an installation.For this reason, cable ladders are available in a variety of sizes and standards, in order to cover thewide range of applications.

Cable ladders and their accessories are classified in series Η35, Η60, Η85 and Η110 according to theirprofile height.

It must be noted that all products displayed as perforated in this catalogue, are available innon-perforated form as well.

Cable ladders are delivered in 3-meter long pieces. Other lengths between 2.5m and 6m are availableon request.

The corrosion resistance level available for each product is noted in the following tables with the re-spective letter:

P: Pre-galvanized metal sheetH: Hot-dip galvanized metal sheetS: Stainless steel metal sheet

In addition, all available products can be delivered epoxy powder coated to any desired color.

PRODUCT DESCRIPTION

STOCK LENGTH: 3000mm

PERFORATION: for ease in cable mounting and vetilation, holes 7x30mm in crossshape and hole centers50mm in x-axis and 25mm in y-axis are punched.

BENDED EDGE: on top of side rail for reinforcement and cable protection.

• Cable ladders can be manufactured from steel sheet pregalvanized acc. to EN ISO 10147 and also avail-able in stock hot-dip galvanized acc. to EN ISO 1461.

• On request cable ladders made of stainless steel sheets can be manufactured.

TYPE H110


SELECTION OF METAL SHEET THICKNESS & DISTANCE BETWEEN SUPPORTS

According to the total cable weight per meter that has been calculated, the metal sheet thickness and the distance be-tween supports can be selected. In this catalogue, a chart is provided for every cable tray type that gives the maximumallowed load per unit length for any combination of sheet metal thickness and distance between supports. By using thecharts, the selected cable support system will be both robust and cost effective.

Selection of support typeThe two basic criteria for selecting the support type are:• The mounting surface (floor, wall, or ceiling)• The load to be supportedOur products cover all combinations of mounting surface and load to be supported.

MATERIAL THICKNESS t=0,75mm

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