Exceeding max adjusted Zs on a board change.

[westward10]

You are doing well to have that Ze and exceed the max Zs for a type B, 32A breaker in a domestic property.

 

[Dave OCD]

I'm missing something, am I wrong with my view on the Zs ?

 

[westward10]

I'm missing something, am I wrong with my view on the Zs ?

Depends if the spur, if it exists is fused at a FCU.

 

[Midwest]

Testing during a board change, a RFC on a 32A 60898, with rcd protection, you find that the max Zs is exceeded by 0.1 ohms using the no trip setting on your mf tester
QUOTE]

QUOTE]

What was the result for Zs as recorded by the MFT, as a matter of interest, or have I missed that?

 

[Midwest]

For some reason, my post won't display outside of the 'quote', so here it is again just in case it gets missed;

What was the result for Zs as recorded by the MFT, as a matter of interest, or have I missed that?

 

[polo1]

Ok guys, thanks for all the points, views, questions!!.
I'm working away for a couple of days and don't have the test sheet here. From memory, the Zs was taken at a spur serving an extractor fan and was around 1.28. I'm going to have to go back and double check the readings, as I'm starting to doubt myself
I'll post back as soon as I can

 

[Leesparkykent]

I would take a reading either side of the RCD and also either side of the circuit breaker for the circuit in question and see what additional resistance its adding.

 

[tigerpaul]

C (because no trip Zs tests are notoriously inaccurate anyway)