AM2S Assesment , Insulation Resistance

Official3LK · Mar 24, 2022

Just done my exam, passed everything except Insulation Resistance...
I can't think how I could've failed because it isn't the hardest thing on the wrold, Tester was on 500V and I tested circuits separately.

Only way I could've failed was how I tested my Ring Final, I wago one leg of ring (L,N,E separately) and tested at other leg.
For FP, I had took fuse out at unswitched spur, but put it back in because Voltage shouldn't have any effect on Fuse and tested there.

Is it worth appealing?

[ElectriciansForums.net] AM2S Assesment , Insulation Resistance

loz2754 · Mar 24, 2022

For insulation resistance testing, the CPCs should be connected to the earth terminal.

Official3LK · Mar 24, 2022

loz2754 said:
For insulation resistance testing, the CPCs should be connected to the earth terminal.

oh ok thanks... so would you recommend doing combined IR then for ring final do the same but make sure rcbo is off?

loz2754 · Mar 24, 2022

If there are connected loads on the ring circuit, eg sockets with built in USB chargers, then yes, link line and neutral together and test to earth.
It may also be necessary to disconnect the line and neutral cables from the RCBO, as the RCBO may be damaged by the test, or may influence the test results.