fault testing at college

[Baker1988]

Hi every one just wanted to ask a few questions about testing for faults at college.

On Thursdays I was in the workshop and they brought a board out with a 1x ring final 2x 2way lighting and a radial socket circuits all wired to a consumer unit but it had been wired up with a few separate switches so they could switch one of the separate switches and it would make a fault on one of the circuits and we had to find the fault but my question is what is the sequence that I should use to find faults I thought start with a global ir test but if that shows no fault what would I do next would I have to go through each circuit seperatly and do a continuity and r1 r2 test?

 

[trev]

The college rigs tend to be fairly simple mate, it'll most likely be either an IR or polarity fault. It might be a high Zs but that's pretty unlikely really.

 

[Baker1988]

Yeah they are only simple there not even connected to a main earth or a live source so just a dead circuit so do you recon I should just go through the dead tests and that should show the fault

 

[trev]

Given the nature of them mate I'd go straight for IR

 

[Baker1988]

Yeah thats what I thought maby a global ir to start with then if there is something wrong go through the circuits individually

 

[trev]

Global IR and when you see the fault switch off the MCBs one by one and retest until the fault clears, fill in the answer paper and claim your pass

 

[Baker1988]

Yeah thats what I thought thanks just wanted to see if I was on the right track or if they should be something else I should be doing instead thank you

 

[trev]

No problem Baker, that's what we're here for