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 Stranded Cables
  • 50 No’s of 2.5 Stranded Cables
  • 20 No’s of 4 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


  • As per Table Cable Factor for 1.5 Stranded Cable=8.1
  • As per Table Cable Factor for 2.5 Stranded Cable=11.4
  • As per Table Cable Factor for 2.5 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

About Jignesh.Parmar (B.E,Mtech,MIE,FIE,CEng)
Jignesh Parmar has completed M.Tech (Power System Control), B.E(Electrical). He is member of Institution of Engineers (MIE) and CEng,India. Membership No:M-1473586.He has more than 16 years experience in Transmission -Distribution-Electrical Energy theft detection-Electrical Maintenance-Electrical Projects (Planning-Designing-Technical Review-coordination -Execution). He is Presently associate with one of the leading business group as a Deputy Manager at Ahmedabad,India. He has published numbers of Technical Articles in “Electrical Mirror”, “Electrical India”, “Lighting India”,”Smart Energy”, “Industrial Electrix”(Australian Power Publications) Magazines. He is Freelancer Programmer of Advance Excel and design useful Excel base Electrical Programs as per IS, NEC, IEC,IEEE codes. 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.

10 Responses to Calculate Cable Trunking Size

  1. Bibhudutta Mohanty says:

    Nixe and use full sir thanx

  2. gayathri says:

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

  3. Gayathri says:

    22.9 factor is for wire…in our calculation we used wires but factor for 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:


  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.


  8. chitrakumar says:

    Dear Sir,

    pls tell , how calculate wire factor for cat6 cable?

  9. Mohammed Rafi says:

    Dear Sir,

    Can you able to tell the IEEE standard number used here

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