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Cable Tray Sizing

A cable tray is a specialized tray designed to organize and manage electrical wires, preventing tangling and facilitating maintenance. The document outlines different types of cable trays, such as ladder, perforated, and solid bottom, and provides a method for selecting the appropriate size based on cable diameter and quantity. It includes formulas and examples for calculating the necessary dimensions for effective cable management.

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ayazakhan1992
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89 views6 pages

Cable Tray Sizing

A cable tray is a specialized tray designed to organize and manage electrical wires, preventing tangling and facilitating maintenance. The document outlines different types of cable trays, such as ladder, perforated, and solid bottom, and provides a method for selecting the appropriate size based on cable diameter and quantity. It includes formulas and examples for calculating the necessary dimensions for effective cable management.

Uploaded by

ayazakhan1992
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as PDF, TXT or read online on Scribd
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Eng Shan Abbas

Cable Trays?
A cable tray is like a Executive Suite for your cables
- it's a specially designed tray that keeps allthose
electrical wires neat, organized, and off the floor (so
they don't form a spaghetti monster behind your
walls!). Instead of letting cables tangle up like a bad
hair day, the cable tray gives them their own stylish
pathway, making maintenance and cooling a
breeze.

Type of Cable Trays


>> Ladder Cable Tray
>> Perforated Cable Tray
>> Solid Bottom Cable Tray
Cable tray Expressway
>> Wire Mesh Cable Tray
|[Wire Al [Wire B] ---[Wire C|
>» Channel Cable Tray |"Smooth rides,no traffiejams!"
Ladder Cable Tray
Wire Mesh Cable Tray
Solid Bottom Cable Tray
Perforated Cable Tray
Channel Cable Tray
Selection of Proper Size of Cable Tray
Steps To Find Out proper size
» Determine Cable Diameter
>> Number of Cables on the Tray
>> Size and Over all Diameter of
Each Cable

1 Determine Cable Diameter


Formulas
>> Area of Circle - A = IX r2
>» Diameter of Circle - D=2r

calculation
for example
we can take 3c x300sqmm cable for finding diameter
calculation Core

aArea is 300
we can take 3c x 300sqmm cable
>> Area of Cirale-A= Tt X r2 >» Diameter of Circle - D=2r
A= T[ X r2
D=2%9.77
r2- D=19,549mm
D=19.549k3
r00..
3.14
- 97 mm D=5864mm
Area of Circle -r=9.7lmm Diameter of Circle -D-5864mm

therefore diameter of this cable is 58.45 mm_

2 Number of Cables on the Tray


Multicore Cable SingleCore Cable
00000
Size and Over all Diameter of Each Cable
Multicore Cable SingleCore Cable
Space factor Space factor
+20% +20%

D D

D2 D D D D2 D2 2D 2D 2D D/2

D- Diameter of Cable D - Diameter of Cable


notes notes
D/2 -Tray end to cable end D/2 -Tray end to cable end
)-Cable diameter D -Cable diameter
-Cable end to end distancelcable diameter) 2D -Cable end to end distancelcable diameter)

Formula Formula
D/2+D+D+D+D/2 +20% D/2+D+2D +D+D/2 +20%

I From this formula you will get the


width of the tray
Width-

2 Height of the cable tray > diameter of


biggest size of cable tray
Heigha0
Example
Find cable tray size which will carry 4c x 300sqmm and 4c x 50sqmm
cable
1 Cable diameter
4c x 300Sqmm = 66mm 4cx 30Omm2

4c x 50Sqmm = 33mm 4cx 5Omm2

case 1: If we choose 300 mm x 50 mm 033)

cable tray 66
900
17

initial wiath

2 Initialcable tray size w= Formulag -Final wkdth

W=d/2+d+d+d+d/2+20% Multicore cable formula


W=33+66+66+33+17+20% given cable is 4c - Multicore
W=215+20%
Width(mm) Height(mm)
W=258mm w=300mm 50 50
100 50
200 50
3 Height of the cable tray 300
100
50
100
H=>diameter of biggest cable of size 200 100
300 100
diameter of 4cx3 00sqmm size 66mm 150 150
200 150
H=66mm H=100mm 300 150

standard sizes for cable tray


upto 300sqmm width
Therefore we need to use 300mm x 100sqmm cable tray
size
Engr S hah Abbas

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