My experience of the AM2 taken at Birmingham

[Baker1988]

I want to ask about the Zs on the circuits on mine i had to do a zs on every circuit but one of the apprentices who has his in a couple of days is adamant that you only have to do the Zs at the sockets and can calculate the lighting and that. Was you allowed to calculate it as i wasn' and have told the appentice he wont be able to so just want clarification if this has changed.

 

[Adam Rudd]

I want to ask about the Zs on the circuits on mine i had to do a zs on every circuit but one of the apprentices who has his in a couple of days is adamant that you only have to do the Zs at the sockets and can calculate the lighting and that. Was you allowed to calculate it as i wasn' and have told the appentice he wont be able to so just want clarification if this has changed.

It has changed as I only had to measure my Zs on the sockets and did the RCD test at the same time. I calculated the rest for all the other circuits and the assessor was fine with that. Just tell your apprentice to make sure the assessor is clear that he is going to calculate the rest of the Zs results.

 

[Baker1988]

Thank you for the clarification. I will pass that along to him. Things change pretty quick i only did my am2 about 3 years ago. Thanks.

 

[jay sean]

I done my AM2 in the late 90s I had to go to Long Eaton to do as a part of my apprenticeship, we had to install and wire metal tube and a lighting CCT, and install MICC.

and then we had to fault find and safe isolation.

 

[LMT]

Very informative. I have my AM2 in January, so I’m just going through it all now. Regards to testing, how did you test insulation resistance? As this is one procedure I’m a little less confident on.

As for the lighting circuit, I’m glad you have said that as I’m pretty sure this the wiring diagram..

 

[Adam Rudd]

Yeah that’s the diagram you have to follow so just wire it like that and your be absolutely fine. Personally I did an IR test on each circuit individually, just made sure I left my earths connected. The assessor does help you abit and understands that your be nervous so literally just ask him and he should point you in the right direction.

 

[Adam Rudd]

Yeah that’s the diagram you have to follow so just wire it like that and your be absolutely fine. Personally I did an IR test on each circuit individually, just made sure I left my earths connected. The assessor does help you abit and understands that your be nervous so literally just ask him and he should point you in the right direction.

 

[LMT]

Yeah I'm not sure if I should test the whole board (global IR) or test each circuit individually. The 3 phase motor circuit you have to do the 10 point test seperately and test from the DB to DOL and then to motor, I understand that.
L1-E L2-E L3-E N-E
L1-N L2-N L3-N
L1-L2 L1-L3 L2-L3

For other circuits individually, just test L-E, L-N and N-E with the circuit breaker and main switch in the off position?

Another thing, just want to be 100% sure on this. Can you remember what you disconnected exactly when testing IR? What did you disconnect regarding the 3 phase motor circuit? I understand the lamp and fuses have to be disconnected under test but just want to be clear.

Thank you.

 

[Adam Rudd]

I’d practice doing both methods (global and individual) and do the one you feel most comfortable with as on the day you need to show that you’re confident. So I disconnected the carbon, luminaire, rcbo (neutral and earth fly leads) and ensured that the spur was off for the heating system. The carbon and luminaire they give you push in connectors so easy to just pull out for testing purposes. For the motor, I tested up to the DOL (top of contactor) and then from the bottom of the contactor to the motor. They don’t give you a motor just a blank box with points to test on so no worries there.

 

[Wilko]

And if there's a dimmer in the light circuit (?) I would bypass it.