pir to installation time?

[andekoch]

When I do a CU change on th einstallation cert I clearly state that it is only the CU that was changed blah blah.
Although before I take out the old board I do a full PIR to make sure there are no surprises when the board is changed. Of late I have been scheduling my PIR's a week befor ethe board change to allow me to plan for code 1 and 2 repairs before the new board is signed off.

I was wondering how long I can reasonable leave it between the PIR and the CU change before I retest everything in full at the CU change. All I do in the CU change at the moment is insul resistance between line and neutral connected together and earth and take the remaining R1 + R2 etc from the PIR (or repairs) I did the previous week.

Do you recon this is acceptable?

 

[bugsy]

The current methodology used changing your C.U. is perfectly o.k.

 

[uksel]

deleted my comment - didn't make any sense as i misread the original post

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still need to do RCD tests. other than that, seems good enough

 

[andekoch]

Yes I forgot to mention that I do the RCD (any anything new) tests as well.

I guess all I am not repeating are the R1+R2 (and these should not be different unless an accessory has failed since my last visit) and the L-N insul tests.

 

[uksel]

if the circuits are RCD protected mate, the R1+R2 loses a bit of relevance

just make a note in the comments and attatch regarding the test dates, hand over the EIC with the PIR and supporting schedules. I would say the lengths you are going to are reasonably practicable...

IMO a week is fine

 

[Guest123]

if the circuits are RCD protected mate, the R1+R2 loses a bit of relevance

Seriously???

 

[roukel01]

Its interesting to see a sparky that actually does a full PIR before a simple board change in a domestic property. I always find it takes too long and puts much too much on the final price of the board change. I personally go and take a quick look, whip the board cover off to see if any circuits have been doubled up etc, then simply say that any faults upon change will be repaired at time and material. This has worked for me in the past years without any problems, it saves time, keeps your prices down and your customers happy,. Maybe I've been lucky, but up to now, I've never found too many big problems when I come to testing out.

At the end of the day, providing the IR vaules are ok and the RCD's don't trip, then any other findings can be reported in your cert and you can always then discuss repair costs.

 

[uksel]

Seriously???

that's my understanding??

 

[Guest123]

In my opinion the R1+R2 test is one of the most important tests to carry out. It confirms continuity of both line and protective conductors and I feel MUST be done before any install is energised.

Are you sure you dont mean Zs??? as the values in BS 7671 can be negated for the 1667ohms value if a circuit is protected by a 30mA RCD???

 

[Johno]

i agree with roukel01

 

[Tester Steve]

In my opinion the R1+R2 test is one of the most important tests to carry out. It confirms continuity of both line and protective conductors and I feel MUST be done before any install is energised.

Couldn't agree more! How many times on here have people been caught out when changing a board? I ALWAYS do a pre-work survey and as a minimum check Ze, bonding, cpc's present, tail sizes and do an IR test. If the customer won't let me do the tests, I make it clear to them, and on the quote, that any work needed later is down to them! Most don't mind the leccy going off for a few minutes.

Steve.

 

[uksel]

R1+R2 isn't continuity of protective conductors - it;s the earth fault loop impedance of the consumers installation.

my point was that the Zs values don't really matter so much now with the use of RCD's

 

[Guest123]

R1+R2 isn't continuity of protective conductors - it;s the earth fault loop impedance of the consumers installation.

I'm sorry you'll have to run that by me again......

Ze = external earth fault loop impedance

Zs = earth fault loop of an internal circuit plus the Ze.

my point was that the Zs values don't really matter so much now with the use of RCD's

But thats not what you posted....you clearly said R1+R2

 

[roukel01]

R1+R2 isn't continuity of protective conductors - it;s the earth fault loop impedance of the consumers installation.

Oh dear

 

[uksel]

it's clearly obvious that what i was trying to say is that worrying about the measured values for compliance is a headache you can live without when using RCD's

not that earthing isn't important - jeez, get a qual for christ sake

he clearly says he takes the R1 + R2 values from the previous and puts them onto the EIC, implying the values ARE used for comparison to bs7671 for TRIPPING TIMES!!!