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

Apostolos

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

Parents

  • In the National Grid link I posted above 19.6 kA is given as the stated PSCC for a single phase supply,  new domestic consumer units should have a conditional rating of 16 kA when protected by the DNO fuse as Mike indicated and as explained by BEAMA in this article, although the stated PSCC is 19.6 kA the 16 kA conditionally rated consumer unit is okay. 

    www.google.com/url

Reply

  • In the National Grid link I posted above 19.6 kA is given as the stated PSCC for a single phase supply,  new domestic consumer units should have a conditional rating of 16 kA when protected by the DNO fuse as Mike indicated and as explained by BEAMA in this article, although the stated PSCC is 19.6 kA the 16 kA conditionally rated consumer unit is okay. 

    www.google.com/url

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