cu change

[paul b b]

hello chaps,

when doing a cu change do you take every socket/switch off the wall or just about 20%

what would you do if you see earth wires twisted but sheathed? or missing brown off a switch live? or a missing grommet?

thanks

paul

 

[Andy™]

basic tests on the circuit: i.e IR, Zs at furthest point (& a few others just incase that wasnt the furthest point. and thats it. its not a PIR.

 

[paul b b]

thanks andy, so you dont unscrew sockets/switches at all unless you need to to test.

thanks

 

[Andy™]

dont unscrew any sockets. thats what the plug adapter lead is for. may have to unscrew/remove the odd light to get access though

 

[paul b b]

thanks very much andy

 

[a1spark]

[quote name='Andy

 

[Andy™]

I think I can add to that.........Ze. PEFC. PSCC. Polarity at selected points...RCD test... Suitability of Main & Supp Bonding... Suitability of Tails...., and general visual .with comments where necessary.

a1spark

they are all tests of the CU youve installed. im refering to the tests on the circuits to be reconnected. but i did miss the polarity test

 

[paul b b]

is there a logic to a cu change? what do you do first? test all then rip out or just rip out and test later?

 

[Andy™]

quick visual. if all looks good, notify customer there may be problems, change CU, test & reconnect. and fault find if any problems

 

[Cirrus]

I always test before changing the C/U as in my early days ended up unable to 'commission' 3 circuits on a c/u change I did due to dangerous readings on ins res.

 

[initforthemoney]

I always take off a few sockets and switches, especially if the install looks like its been messed with.

Ive seen many times, cpc's being used as a line conductor.

 

[AAAMUSEMENTS]

what would you do if you see ...... a missing grommet?

Inform Wallace IMMEDIATELY.

:coat

 

[nutsy]

I think I can add to that.........Ze. PEFC. PSCC. Polarity at selected points...RCD test... Suitability of Main & Supp Bonding... Suitability of Tails...., and general visual .with comments where necessary.

a1spark

if you think that the property needs a re-wire whats the best way of noting that on the cert. ie needs re-wire or installation unsatisfactory? cheers

 

[VoltzElectrical]

ALWAYS test first. You need to know that there are no earth faults that are going to trip out your newly installed rcd/bo's and cause you a major (unquoted for) ball ache. Either that or have a clause in your quote, allowing for these problems.

 

[PC Electrics]

if you think that the property needs a re-wire whats the best way of noting that on the cert. ie needs re-wire or installation unsatisfactory? cheers

If any circuit is unsatisfactory, then surely you wouldn't be connecting it to the new CU. If the whole installation is unsatisfactory, surely you'd refuse to fit a new CU and recommend a rewire.

[assuming that remedial works would be so costly that a rewire is warranted]