Neutral earth fault

[Guest 004]

@ MDJ Indeed! and thank you

@IQ (not here yet) WHERE ARE YOU!!!!

 

[Guitarist]

Agreed apart from the few minutes remark.

That said I would rather test every socket upon energising

Ok, a few minutes is optimistic. I have just finished a complete rewire on a property, and to cross-connect as I said in my earlier post and test at every point, noting every reading, took less than 20 minutes.
What I'm getting at is that there is no excuse to miss out parts of essential testing on a new install.

 

[Guest 004]

It is the mangers that do not appreciate how long it takes to test correctly. Especially when you have a long run of these tests to do. For example a 3 bed flat has over 60 socket (individual modules) on current project. That in itself will take longer than the whole of the remaining test. So that is 120 tests just for the sockets!

You will still need to test live at every socket, so IMO, doing it live will in effect will get a lot more results, and is a considerable time saver.

 

[snowhead]

Energising and then live testing would be O.k , but not good practice, if there is no-one else likely to be put at risk of using an incorrectly wired socket or appliance and there is no risk of fire etc.

So the flat / house would have to be empty and secure.

 

[Guest 004]

Energising and then live testing would be O.k if there is no-one else likely to be put at risk of using an incorrectly wired socket or appliance and there is no risk of fire etc.

If the 'said' socket was used after energising then the RCBO would trip (given that the load was >30Ma).
That said when I live test, there is a permit to work in place!

 

[derek preece]

Just to make clear, incase anyone reading this didn't know, a Martindale socket tester will not pick up a neutral/earth crossed connection which is why the correct dead tests are so important.

 

[Guest 004]

Just to make clear, incase anyone reading this didn't know, a Martindale socket tester will not pick up a neutral/earth crossed connection which is why the correct dead tests are so important.

No but doing a loop test will

 

[derek preece]

I always carry out the sequence of tests in the order I was taught at college, I do a Ze test before starting the design for a new installation, all the rest of my live testing is done after all the dead testing has been done. I only do new installations though so that is why I don't rely on Zs testing, I just use calculation.

 

[Guest 004]

I always carry out the sequence of tests in the order I was taught at college, I do a Ze test before starting the design for a new installation, all the rest of my live testing is done after all the dead testing has been done. I only do new installations though so that is why I don't rely on Zs testing, I just use calculation.

I was never 'taught' to do R1Rn
Indeed I am struggling to find any reference for this

Certainly not in NICEIC Inspection, Testing and Certification, not in BS7671
If it is BS7671, I would like to know where

 

[BigTom83]

You don't record r1 + rn, but you do do it. Look in on site guide, how to test a ring. Tells you step by step.

 

[Guest 004]

You don't record r1 + rn, but you do do it. Look in on site guide, how to test a ring. Tells you step by step.

cannot see R1Rn test

Please use correct R (not r) as it can and will confuse people

OK have seen it in OSG

 

[BigTom83]

If you have got red on site guide, bottom of page 81. Continuity of ring final circuits, step 2.

 

[Guest 004]

If you have got red on site guide, bottom of page 81. Continuity of ring final circuits, step 2.

Indeed Thank You, have edited previous post

 

[derek preece]

There is also, on pg 38 of GN3, an explanation of (r1+rn)/4

 

[Guitarist]

There is also, on pg 38 of GN3, an explanation of (r1+rn)/4

Absolutely. All that said, a thorough R1R2 will pick up cpc in the wrong terminal anyway.