Supply info for certs on industrial jobs

[ses]

hi

How can I find out ze and the supply fuses info at a factory installation for a certificate?
I cant turn all the factory off to disconnect and do a ze test and I cant remove the service head to see fuses.
The niceic have said that you should put not verified on the certificate or phone the supplier and ask them.
I have phoned Eon and they said they have no idea what the fuses are and can only say the Ze should be no higher than 0.8 for the tns supply.
I want to knowwhat others do in this situation ?
I have installed new circuits.
Answers please

 

[wallyanker]

Hi

If you do a Zs reading on your circuit, then deduct the R1 + R2 reading, this will give you a calculated Ze reading.

 

[ses]

Are you allowed to do that? I thought you couldnt calculate ze that way

 

[wallyanker]

I was allowed to do it in my Level 3 Practical exam, had to show two methods of obtaining ze, measurement and calculation.

 

[ses]

ok cheers mate ill ask my niceic chap nxt week when he comes

 

[Risteard]

I don't think that's a legitimate way of calculating Ze.

However you could ascertain Ze by Enquiry of the Distributor.

 

[Spudnik]

By measurement or enquiry is on the forms.

I think as long as your Zs's are well within limits then you should be ok.

You can always enter 0.8 on the cert and note it.

 

[ses]

Thanks guys

I did call eon but they didnt know just said it shouldnt be higher than 0.8 ohms

 

[Risteard]

Thanks guys

I did call eon but they didnt know just said it shouldnt be higher than 0.8 ohms

In that case I would record 0.8 Ohms as your Ze. (It's quite normal for them to quote the maximum, e.g. 0.8 Ohms for a TN-S system.)

 

[ses]

Ok thanks ill put that down.
As regards to the supply fuses do you put down N/V in the box?

 

[Sintra]

I would write LIM and mention it in the agreed limitations section.

 

[ses]

There is no agreed limitations on an eic certificate