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What is the purpose of Prospective Earth Fault Current measurement in a 3 phase DB

Apostolos 8 months ago

Good afternoon

On a 3 phase DB what is the purpose of measuring the PEFC?

I know we measure the prospective short circuit current between L1,L2,L3 and N and then double the highest reading.

This is the Prospective Fault Current which is being recorded.

Why should we waste time with prospective earth fault current?

Are there cases where PEFC is higher than PSSC?

Thanks

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Sparkingchip 8 months ago

But, that doesn’t hold true for distribution boards and fuse boxes with semi-enclosed fuses.

electrical.theiet.org/.../semi-enclosed-fuses.pdf

So it may be better to actually take a measurement and record the test result, rather than just writing down the DNO figures, to be realistic.
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Sparkingchip 8 months ago

But, that doesn’t hold true for distribution boards and fuse boxes with semi-enclosed fuses.

electrical.theiet.org/.../semi-enclosed-fuses.pdf

So it may be better to actually take a measurement and record the test result, rather than just writing down the DNO figures, to be realistic.
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