# Calculate Cable Trunking Size

Example: Calculate PVC Trunking size for following Power Cables running through Trunking .Consider 10% as Future expansion

• 30 No’s of 1.5 Sq.mm Stranded Cables
• 50 No’s of 2.5 Sq.mm Stranded Cables
• 20 No’s of 4 Sq.mm Stranded Cables
 Cable Factor for Trunking as per IEEE Type of Cable Size of Cable Factor Solid 1.5 7.1 Solid 2.5 10.2 Stranded 1.5 8.1 Stranded 2.5 11.4 Stranded 4 15.2 Stranded 6 22.9 Stranded 10 36.3 Stranded 16 50.3 Stranded 25 75.4 Stranded 35 95 Stranded 50 132.7 Stranded 70 176.7 Stranded 95 227 Stranded 120 284 Stranded 150 346
 Trunking Factor As per IEEE Trunking Size (mm) Factor 75 X 25 738 50 X 37.5 767 100 X 50 993 50 x 50 1037 75 X 37.5 1146 100 X 37.5 1542 75 X 50 1555 100 X 50 2091 75 X 75 2371 150 X 50 3161 100 X 75 3189 100 X 100 4252 150 X 75 4787 150 X 100 6414 150 X 150 9575

## Calculations:

• As per Table Cable Factor for 1.5 Sq.mm Stranded Cable=8.1
• As per Table Cable Factor for 2.5 Sq.mm Stranded Cable=11.4
• As per Table Cable Factor for 2.5 Sq.mm Stranded Cable=22.9
• Total Cable Factor= No of Cables X Cable Factor
• Total Cable Factor=(30X8.1)+(50X11.4)+(20X22.9)
• Total Cable Factor=1271
• Total Cable Factor After 10% Future Expansion=1271+127 =1398
• As per Table Suitable Size for PVC Trunking for Cable Factor 1398 is 100 X 37.5

### Suitable PVC Trunking is 100 X 37.5 mm

Jignesh Parmar has completed M.Tech (Power System Control), B.E(Electrical) from Gujarat University. He has more than 14 years experience in Power Transmission-Power Distribution-Electrical energy theft detection-Electrical Maintenance-Electrical Projects(Planning-Designing-coordination-Execution). He is Presently associate with one of the leading business group as a Deputy Manager at Ahmedabad,India. He is Freelancer Programmer of Advance Excel and design useful Excel Sheets of Electrical Engineering as per IS,NEC,IEC,IEEE codes. He is technical Author for "Electrical Mirror" and "Electrical India" Magazines. He is Technical Blogger and Familiar with English, Hindi, Gujarati, French languages. He wants to Share his experience & knowledge and help technical enthusiasts to find suitable solutions and updating themselves on various Engineering Topics.

### 7 Responses to Calculate Cable Trunking Size

1. Bibhudutta Mohanty says:

Nixe and use full sir thanx

2. gayathri says:

22.9 factor is for 6Sq.mm….we dont have 6Sq.mm in our calculation.20No’s is for 4Sq.mm so factor will be 15.2..please let me know the calculation again

3. Gayathri says:

22.9 factor is for 6Sq.mm wire…in our calculation we used 4Sq.mm wires but factor for 4Sq.mm is 15.2 ..plaese clarify

4. Monik Sapariya says:

Respected Sir,

good afternoon,

sir i want to know that how much distance is required between wall and industrial indoor panel ? is distance depend on voltage ? if yes, any standard formula or any Indian standard available for the same?

i am waiting for your green and golden replay.

Thanks & have a safe day, Monik Sapariya (M) +919662336159

5. fazal says:

correction factor means ?how to find it?

6. mostafa ali says:

I CAN CONSIDER IN MY CALCULATION THE SAME FACTOR FOR BOTH MULTI& SINGLE CORE CABLES

7. Balamurugan says:

Dear Mr.Jignesh.Parmar

May i know that i saw ur mcb/elcb size calculation there first branch load calculation how became 0.73A .i was try that but i have 0.71A . could u explain that.

Thanks
by
Bala