Discuss PFC Three-phase supplies in the Periodic Inspection Reporting & Certification area at ElectriciansForums.net

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Sly

Can someone tell me how to correct measure Prospective fault current and external earth fault loop impedance (Ze) for a domestic property in Three-phase supplies!
I use Fluke 1653
Thanks in advance


:confused:
 
Hey.

Ze - same as you would for single phase, only do it 3 times and record the highest.

PFC - (3 lead instrument) measure betwenn L,N+E and multiply by 2, as the highest fault current is usually between phases.
 
Last edited by a moderator:
So basically, you put test leads on
L1 - N - E = ?? then X by 2
L2 - N - E = ?? then X by 2
L3 - N - E = ?? then X by 2

The highest reading out of these 3 test, you record...
Is that correct??:)
 
No the earthing conductor stays connected for pfc to include parallel earth paths when measuring pefc, yoo only disconnect for Ze, you can of course with most instruments take a pefc at the same time as Ze but it may not be a true highest reading
 

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