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

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About Jignesh.Parmar
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.

6 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

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