Cable sizing from Switchboard to switchgear

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Tsukii

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Philippines
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Electrical Engineer
Hello, everyone! I would like to ask on things to consider in sizing cable that connects switchboard to switchgear. Any formula or sample will be much appreciated. Thank you so much.
 
That’s a short question with a long answer.
If you use the NEC we can help.
What is the size feeder breaker to switchgear?
Have you done a load Calc? (Art 220)
NEC ampacity tables are in Art 310
 
There are variations for motor or HVAC loads but the basic "formula" is to select a cable to carry the load and protect it at it's ampacity.
Thats a simplification as there are many variables involved..
 
tom baker said:
That’s a short question with a long answer.
If you use the NEC we can help.
What is the size feeder breaker to switchgear?
Have you done a load Calc? (Art 220)
NEC ampacity tables are in Art 310
Click to expand...
The switchboard is 12kV and the main feeder breaker is 12kV, 2000 A, 40 kA rms.
 
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