Practical inspection and testing on rig

[rockenroll]

I ve got it last friday I ve paid to OLCI 550 £, they did t show us nothing practical, 2 fellas took first time megger 1552 in their hands without nobody tell them how to use it ,2 h revision follow exam 3h on rigs Visual inspection, IR easy, for PIR no info available, survey and testing follow the completion of certificate.Tight time.We don t have the results yet

 

[Steve]

Thanks.

 

[Spark123]

C&G 2391? I did this practical exam a while back with another firm, found it all quite run of the mill stuff. If you are not sure on how to use a particular instrument I don't think there would be any problem in asking the examiner how to set it up i.e. how to null the leads etc. I don't think it would be fair to expect you to know how to do this on every existing make and model of instrument! We used separate instruments (combi RCD/EFLI and a cont/IR tester) for the I, T & C of the main board and a multifunction tester for the other test boards.
I found out there and then that I had passed the practical exam.
The written exam took a bit longer!!

 

[rockenroll]

Examiner start our class with a presentation of sequence for test,he gave one meter to everyone,I ve got mine,and after that ,I thought that he will show us the sequence of tests on the rig,but he start the test,no book provided as GN3,ON-SITE G,I ve got mine books so I shared with the boys .I know the sequence of test,how to do every test,how to use the meter but I feel that I did t have chance to show what I know because our class wasn t properly explaned in special for PIR on installations without diagrams,charts etc,where a degree of exploration work is required,for how much we ve paid .
We ve start 1st with PIR test in a rig already isolated and after dead testing I asked him about key to unlock the locker to do the live test for Ze,PFC,Zs,RCD, but he was sending me to do visual inspection,Insulation resistance...
I feel that they did t provide this course properly for 550£, taking in account that they will send to us homestudy material for writing assesment, something what I already have ...

 

[RF Lighting]

Thanks.

 

[rockenroll]

Very smart

 

[Spark123]

Examiner start our class with a presentation of sequence for test,he gave one meter to everyone,I ve got mine,and after that ,I thought that he will show us the sequence of tests on the rig,but he start the test,no book provided as GN3,ON-SITE G,I ve got mine books so I shared with the boys .

Is this the C&G2391?
I don't think they covered the sequence of tests on the rig for our course either, not that it mattered too much. I have my own copy of GN3, OSG, memorandum on the EAWR, BS7671, not sure if everyone else on the course did though.

I know the sequence of test,how to do every test,how to use the meter but I feel that I did t have chance to show what I know because our class wasn t properly explaned in special for PIR on installations without diagrams,charts etc,where a degree of exploration work is required,for how much we ve paid .

Can't remember now, but I don't think it took much exploration? As long as we carried out the relevant inspections and tests for the installation correctly and in the correct order, recording the results on the correct form within the given timescale then how can you go wrong? It is a pass/fail exam.

We ve start 1st with PIR test in a rig already isolated and after dead testing I asked him about key to unlock the locker to do the live test for Ze,PFC,Zs,RCD, but he was sending me to do visual inspection,Insulation resistance...

As in the sequence which you would do it for commissioning a new installation?
I know you do not need to follow the same procedure for a PIR, however, why would you prove dead, then energize only to have to isolate and prove dead again to carry out more of the inspection / tests? Had you not already done IR test before you wanted to energize? You should have already done the inspection before you did any of the testing (bar proving dead.)

I feel that they did t provide this course properly for 550£, taking in account that they will send to us homestudy material for writing assesment, something what I already have ...

Not sure which course you are doing? Do you mean revision papers / past papers for the 2391 written exam?

 

[rockenroll]

Thank you for your nice explanation mate. Supply was already isolated but he told us to prove dead, make survey because no info available for PIR, and after I ve done all dead test (continuity, IR), so after I ve asked the examiner to gave me the locker key to do the dead test,but he told me ,,It s ok go now on that rig for visual,and on that rig for IR,,
I ve completed the certificates and thats it

 

[rockenroll]

By the way how did u make continuity test,did u test for R1+R2 or just R2,
Circuit for ring final was - feed from 32 A Type C(1 phase) to 3 phase isolator(BS 3036 - 32 A),passing the phase thru fuse and going to ring final, the feed for subpanel was made on 2c10mm-swa, the earth was made thru swa shield

Thank you

 

[Spark123]

Normally I only do R1+R2. You'd only need to do R2 if you are using a maximum touch voltage. I think we were asked to do the R2 also on the test rig but imho was a bit pointless.
Might not be the most streight forwards way to wire a RFC, do you mean a 30A BS3036?
Don't know why a 3 phase isolator was used
It is acceptable to use the armour for a CPC.

 

[rockenroll]

Yes 30 A BS 3036, what do you thing about breaker type B 40 Amps to feed subpanel,and main isolator in subpanel was RCD 63 Amps,I think for RCD in subpanel was accepted armoured strand of swa as earth,normal in any installation a suplementary earthing conductor (at least 10 mm for 10 mm phase- neutral) should be installed - triki

Thanks mate[/img]

 

[Spark123]

Nothing wrong with an RCD with 63A rated contacts downstream of a 40A MCB, an RCD is not an overcurrent protective device. Only issues may be the RCD will kill the whole board, not best practice when it is feeding lights and sockets. The board will also be limited to 40A, as it is only a test rig I don't see this as a big issue.

It may be normal practice to use an additional core of the SWA for the CPC, however as long as the size of the armour is compliant with table 54G (taking into account the different metals) or the adiabatic equation then it is fine just to use the armour. You can still buy 2 core SWA off the shelf, one advantage of using a 3 core SWA using the 3rd core to double up the CPC is that it will automatically comply with table 54G.

 

[lazygit]

By the way how did u make continuity test,did u test for R1+R2 or just R2,

If you do R1+R2 and flick switches while your at it you then prove polarity at the same time
regards

 

[rockenroll]

I ve asked u about R1+R2, or R2 measure because in my two light circuits test rig I had the mettalic trunking as cpc, so I get just R2 value and record it, R1+R2 was t possible because of innacurate value due to mettalic trunking.
And sorry I think I miss some I had 2 isolators, both of them with BS 88 and not BS 3036.
In ring final, measured loop P, N, CPC (csa the same) was 0.07 ohm,with 5 socket outlets, I had different values almost the same for P-N and P-CPC, 0.75, 0.60, 0.62, 0.45, 9.2 0hm, I think the ring was faulty, or because of resistance what they have fitted, what should be completed in the PIR certificate.
I know that all sokets outlet should be verified in this case but I find a lot wires disconnected and fitted back, so I will loose my exam time to fix the rig for them
What do u think

Thanks for your feedback
I appreciate that mate...

 

[rockenroll]

P-P 00.7 ohm
N-N 0.07 ohm
CPC-CPC 0.07 ohm