PEFC & PSCC (or PFC) are the prospective fault currents under short circuit & earth fault conditions & should be tested at the cu, pscc = phase/neutral (double result for 3phase) & pefc = phase/neutral/earth.
You should also test at everyrelevent point of the installation, such as remote db's or basicaly where a protective device has to operate under fault conditions.
If you haven't got it, get a copy of Guidence Note 3 & you'll find all the info you need under section 2.7.15
Hope that helps
Quote:
Originally Posted by LScotty  I think you test it at the farest ie ceiling rose/socket point of the circuit. don't quote me on the that. i'll get you an accurate answer very soon |
You are on about Zs (earth fault loop impedance)
