how to upgrade the earthing conductor?

[IQ Electrical]

thanks all, last question, how to distinguish between tn-s and tn-c-s?

Are you kidding me here?
You've done a PIR which requires 'an above average knowledge of BS7671' and you can't identify the earthing system?

 

[Mark_Burgess]

thanks all, last question, how to distinguish between tn-s and tn-c-s?

You could see the illustrated pictures in your on site guide or GN3 book.

 

[Sav]

Are you kidding me here?
You've done a PIR which requires 'an above average knowledge of BS7671' and you can't identify the earthing system?

Thats what I thought in my post, hence the " you have just done an inspection" quote !!
Sav

 

[Mark_Burgess]

I am waiting for the, I dont have an on site guide, or whats a GN3 book!!

 

[rocker]

When you say 'inspection', you mean having a look when pricing a job, not a periodic inspection, right?

 

[theugly]

calm down guys, let me explain before you get further, i certainly know the difference between the two systems, but when you are on site, it is difficult to tell the difference between them, i know you guys are very experienced, but from on site guide i dont think it is very obvious and enough to make everyone can identify them immediately, so why not be more patient and more constructive?

 

[IQ Electrical]

calm down guys, let me explain before you get further, i certainly know the difference between the two systems, but when you are on site, it is difficult to tell the difference between them, i know you guys are very experienced, but from on site guide i dont think it is very obvious and enough to make everyone can identify them immediately, so why not be more patient and more constructive?

I like to think I am helpful here but it's one thing asking about the interpretation of a certain regulation and another thing asking worryingly basic questions AFTER an inspection.

 

[rocker]

If you haven't seen many of them then yes it may be a bit tricky, but for somebody who is experienced enough to do a periodic inspection, you should be able to do it in your sleep.

The purpose of a PIR is to determine the safety of an installation.

If you can't identity the earthing system, how can you tell that the Ze is low enough? This is a major safety issue.

I'm sorry mate but if you are indeed doing a PIR you may find yourself on more sticky wickets in the future.

 

[Mark_Burgess]

You could always have a lengthy phone call with the supplier and ask them what the earthing arrangement is, they should be able to give you the information you require, after being passed around about.

Also, never remove the tape or sleeving off the incoming supply unless you want to be prosecuted for tampering with the suppliers equipment!

 

[ridemx27]

Like iq said pir require an above knowledge of Bs7671, i served about 6 years before completing a pir on my own and the amount of people iv seen coding no rcd protection etc as code 1 !!! point is its in in depth test which requires a lot of on-site knowledge and the regs extremley well, sounds like u may of been thrown in the deep end iv had the same with employers in the past.