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!

 

[Baker1988]

Aslog as it makes a good connection and is done correctly probily not. That been said a friend of mine failed his install part of the am2 due to using 1mm fly leads on the metal back boxes so who knows.

 

[gazdkw82]

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.

So are you able to stop the install midway through and carry on the next day?

Sounds like your doing good time

 

[RyanF]

So are you able to stop the install midway through and carry on the next day?

Sounds like your doing good time

Yeah you get a total of 8 hours I believe so I cant do that over one day. So I try and get most of it done in one day then the other day is the remaining time along with the other timed units etc.

 

[Simonslimline]

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.

You have loads of time left. The s plan is very simple with the diagram, just wiring by numbers.

Good luck

 

[RyanF]

You have loads of time left. The s plan is very simple with the diagram, just wiring by numbers.

Good luck

Simon i need your help, how do you measurePEFC AND PSCC using a Megger MFT 1730 just im doing my inspection and testing soon. Like within the next 2 hours. Do you have any hints or tips for the testing, inspection and fault finding?

 

[RyanF]

Its also on the Schinieder Isobar 3 phase board same one you mentoined to me.

 

[gazdkw82]

How did it go today?

 

[Simonslimline]

Simon i need your help, how do you measurePEFC AND PSCC using a Megger MFT 1730 just im doing my inspection and testing soon. Like within the next 2 hours. Do you have any hints or tips for the testing, inspection and fault finding?

Flat out at work again today trying to finish a substation ready for yesterday, only just seen this mate.

How did it go?