Wetroom Store - Network Wetroom Suppliers
This official sponsor may provide discounts for members

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

S

Sly

Welcome to ElectriciansForums.net - The American Electrical Advice Forum
Head straight to the main forums to chat by click here:  American Electrical Advice Forum

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:
 
Electrical2Go - Online Electrical Supplier
This official sponsor may provide discounts for members
G

Guest123

  • Thread Starter Thread Starter
  • #2
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:
S

Sly

  • Thread Starter Thread Starter
  • #3
Thanks a lot
 
Last edited by a moderator:
D

DanBrown

  • Thread Starter Thread Starter
  • #4
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??:)
 
G

Guest123

  • Thread Starter Thread Starter
  • #5
For a 3 wire instrument, correctamundo.:)

For a 2 wire, test L+N and L+E multiply whichever is highest by 2 and het presto.;)
 
B

BristolSpark

  • Thread Starter Thread Starter
  • #6
Do you not have to disconnect the earth first also.
 
T

trebor

  • Thread Starter Thread Starter
  • #7
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
 
Bulk Workwear - Clothing Suppliers for the Whole Forum Network
This official sponsor may provide discounts for members

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

Top Bottom