Discuss Sub Main Zdb Test in the Electrical Testing & PAT Testing Forum area at ElectriciansForums.net

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Hi, this is my first post here.

I have a 3 phase board with a 40amp circuit breaker supplying a single phase board to a small office.
I understand that with the 3 phase board how to get the Ze thats not an issue. How do I test to get my Zs (Zdb) for the single phase board?

Do I link the L&E together in the 3 phase board and then test between L&E on the main breaker for the single phase board? This will give me a Zs then i add this to the R1 + R2
I want to get a reading for my Ze at DB for my sub main board on the EICR

Thanks
 
Use an earth fault loop impedance tester, you measure Zs at the single phase office board. No different to any other circuit.
 

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