AM2 exam is Monday Morning Need Help with PFC testing on 3 phase and rcbo testing on lightingcircuit

[RyanF]

Hi everyone,

Not going to lie I am crapping my self for my AM2 exam on Monday Morning at 8:00. So I just need a few questions answered:- tell me if I am right or wrong.

I will be using a megger tester by the way.

PEFC testing 3 phase ( 3 probe test) :-

Clamp croc clip on the neutral bar.

L1-N -E
L2-N-E
L3- N -E

People say do to simply:-

L1-E
L2-E
L3-E

Keep a mental note of the highest figure.

PSCC on 3 phase ( 3 probe tesy but, put the neutral test lead/probe into the earth test probe so its now a 2 lead test)

Test between:-

L1-N
L2-N
L3-N

Mental note of highest figure.

Out of both test the highest figure is doubled as a rule of thumb as the fault current could occur between two phases. This fig is recorded on the test sheet as IPF.

For testing a RCBO on lighting circuit people say disconnect the load and carry out IR seperate, but also still test the RCBO tripping times but how would you do that? As in the exam you are not aloud to expose any live conductors during the live tests.

Also, when doing IR test you have to disconnect certain equipment. But, when doing the ring main there is outdoor socket with a neon fused spur in. How do you disconnect the neon out of the socket. Can you simply out the connections to this socket in a wago connector and put the socket back on, as there will be no conductors connected to the outdoor sockrt. But, I am still testing the conductors?

Any help would be great!

HELP!

 

[RyanF]

I would personally just take all the line/live out of the fused spur and connected them in the back with a wago thats how i did it but i suppose the way you describe would be fine aswell.

When the board is live you are allowed to take the cover off it that does not necessarily expose live parts. So you will be able to test the rcbo at the board. Are you sure the rcbo is on the lighing circuit as if I remember rightly i put the rcbo on the socket circuit and as you know you can just test the rcbo from the socket closest to the board.

And yes thats wouldnprove polarity.

Thats great mate thanks alot!

So Im I right in thinking the ring main circuit would be connected as a ring obviously but simply run all the sockets in a ring as in run the supply in the fused spur. But take the load for the outside socket on the load side of the switched spur?

 

[Toneyz]

So let me get this right when doing the IR test on the sockets as it will be on a RCBO I am right in saying disconnect the load side from the fused spur and put the load side into the supply side of the spur. But put it back on the load side once the IR test is complete?

ONLY WHEN DOING L-N IR TEST AND YOU HAVE NEON. As the neon will give you a dead short.

I would personally just take all the line/live out of the fused spur and connected them in the back with a wago thats how i did it but i suppose the way you describe would be fine aswell.

AS ABOVE.

 

[Toneyz]

So by testing the RCBO how would do to that thought even though we cant remove the DB cover or any accessories as the installation will be “live”. They wont let you do it on your AM2 that way.

Do it at accessory

 

[Loki]

Hope it all goes well tomorrow

 

[ruston]

And from me too.

 

[RyanF]

Thanks everyone starts at 8 oclock tommorow Morning and find out my result on Wednesday Night at 8 pm! Gonna be scared to check my email for my results

 

[ruston]

Keep hydrated , no big meals before the exam, bit hard that time of morning though, but don't overload your stomach.
And if there is a written element RTBQ (read the bloody question) properly .

 

[RyanF]

Keep hydrated , no big meals before the exam, bit hard that time of morning though, but don't overload your stomach.
And if there is a written element RTBQ (read the bloody question) properly .

I always have a smsll breakfast before any big exam or test like poridge and bananas. Have you got any last minute quick tips for the exam?

 

[ruston]

Well you have just said it with the bananas, they are brain food.
Ross Braun on the F1 pit during the race always ate bananas when they had to think on their feet.

 

[Toneyz]

Do it at accessory

And when rcd/rcbo testing test the test button last.

 

[RyanF]

And when rcd/rcbo testing test the test button last.

Test it last as in after the Tripping Times etc. So carry it out during the functional testing?

 

[Toneyz]

Test it last as in after the Tripping Times etc. So carry it out during the functional testing?

No, do your tripping times then as part of rcd/rcbo testing sequence you test the operation of the test button last.

 

[Tes369]

Don't test it like this

 

[gazdkw82]

How did it go?

 

[RyanF]

How did it go?

To be honest not as bad as I thought. Ive got 3 hours left on my install to do the S plan and data points. All other cables/ circuits are terminated and connected. I still need to check the conductors and fixing etc against the spec.

Then on to inspection and testing / fault finding tomorow.

Would I loose marks if I use the wrong size crimps on the cpc for the swa banjo etc? Not really good with using crimps.