LV cable sizing for short circuit condition (NEC)


Do we need to perform short circuit condition i.e let through energy condition while sizing the LV cables as per NEC (National Electrical Code)?

Best Answer

I assue you are in the US. Perhaps not.
I do not know the regulatory needs for NEC (National Electric Code) design, not having waded through the documentation below, but design sizing would not usually be associated with testing in any way.
Design is usually a matter of using tables or calculators or performing calculations and applying relevant requlatory codes.

After installation you "will need to" [tm] test the installation, but that is another issue.

Liable to be very useful Complicated attempt to simplify confusing NEC requirements

Cable sizing table {NEC extract}

Here is a useful online NEC cable sizing calculator

Another NEC cable sizing calculator

Sizing tables here - solar emphasis.

Advice and sales pitch for their software here
Why they, and others, think you may want expert assistance:

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Basic NEC design rules here

Simplified guidelines for Joe average


Very nice Belden cable catalog

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