High Zs reading

[westward10]

Yes you can give some leeway but if your cpcs are 1.5/1.5 then your reading is way above what it should be.

 

[Jacko]

Yes you can give some leeway but if your cpcs are 1.5/1.5 then your reading is way above what it should be.

Should I be looking for Anything other than a loose connection ?

 

[Julie.]

I think I should look again for the loose connection on the CPC, I’m pretty sure the cable is 2.5-1.5.

does the result have to be within 1.67 or is it allowed to be slightly over? I was told 1.67 is what we would expect to see so when would you start to look into it?

Typically MFTs are +/- 0.05 ohm.

So if the calculated value was say 0.41 x 1.667 = 0.683 ohm. The it could be exactly this and measure anything between 0.633 and 0.733

In reality the values could be a bit wider to account for bad contacts etc.

Switching the socket on/off a few times, and plugging/unplugging can bring it down

So it's a matter of what you think is reasonable

 

[westward10]

Should I be looking for Anything other than a loose connection ?

Had two circuits like this couple of weeks ago and both were terminal screws on the green/yellow sleeving and not the conductor.

 

[Wilko]

Excellent. Would you write that result on the test form and mention the fuse spur somewhere? Thank you

If the fused spur was on Cct 4 say, then I put it under that as Cct 4A and put a short explanation in the note section.