@Lister1987 I'm not really disagreeing, a couple of comments:
Even on an EICR doing IR tests as late as possible with everything back together is good practise, so if I've put an accessory screw through a conductor at a light switch or socket or caught something in a metal trunking cover it's picked up by the test. It's very embarrassing if a stupid mistake while carrying out T&I actually makes something worse!
Tracking down faults requires skills and thinking processes that are simply not taught as far as I can tell..
A real life EICR example from this year....IR testing an older CU with an RCD main switch.
Circuit 1, L+N bar to cpc bar is 80 Mohm (pass)
Circuit 2, L+N bar to cpc bar is 40 Mohms (pass)
Circuits 3-7, L+N bar to cpc bar is 0 Mohms.
Circuit 1
again, L+N bar to cpc bar
is now 0 ohms.
Circuit 2
again, L+N bar to cpc bar
is now 0 ohms.
Does anything you learn at college help you know what to do next? At this point no circuit can be turned on without tripping the RCD, and the tenant is getting cold. I'm sure a lot of the members on here would know exactly what to do next but would an average newly-qualified person who has just passed 2391-52?
Agreed.