IR test method 2

[james king]

is this test exepatble and does it bypass tranny and bulbs ect? i have been told on here befor ye so i am just wondering

 

[Guest 004]

What are you supposed to be testing on your IR .................just a piece of cable, the IR test is not for accessories or luminaires.

I would run the cables, in your conduit or trunking, or whatever your erection method is, do your switch drops and then before I started to fit the luminaires I would do a full IR test on the cable i've installed, and that would mean activating the switches to include the drops. If your switch incorporated a neon, then I would just choc block out the cables and not fit the switch.

This would for me confirm that the cable I've installed is not damaged. Once I fitted all the accessories and luminaries I would do a L/N to E IR test on 250 volt DC just to confirm that i hadn't nipped a cable when fitting the fixtures.

What about if you get a cable trapped, when you put the fitting cover on?

 

[mayfair]

Malcom said after putting the fitting on he would do a L/N to E testt on 250 V to confirm if your a careless git or not

What about if you get a cable trapped, when you put the fitting cover on?

 

[Guest 004]

you should also do a P to N test with the switches off.

 

[malcolmsanford]

What about if you get a cable trapped, when you put the fitting cover on?

Not quite sure how you have done Hi-bay lighting but every installation I have done with them either by trunking, conduit, SWA have incorporated the termination of the fixed installation via a quick realise coupling as per regulation 559.6.1.1

So it would be a completed installation just not having the luminares fittied. So the chances of me trapping a cable would be picked up before the final hanging of the luminaires, but I would just give it a quick 250v L/N-E check as notihng can be more embaressing as a big bang.

 

[malcolmsanford]

you should also do a P to N test with the switches off.

Just noticed after answering this as if it were 2 way strappers ...............

 

[mayfair]

dont be boring Malc LOL

notihng can be more embaressing as a big bang.

 

[malcolmsanford]

dont be boring Malc LOL

Well that's my theory anyway ...................where is Stephen Hawking when you need him

 

[Guest 004]

Just noticed after answering this as if it were 2 way strappers ...............

disconnect the switch line , then test all relevant positions

 

[mayfair]

I put some led lighting in a pole dancing club a while back they had two way strappers, think thats what they were called the owners were russians

Just noticed after answering this as if it were 2 way strappers ...............

 

[telectrix]

strappers or slappers?

 

[SimpleSimon]

Test method 2 does come handy. Had a 5 day PIR last week on an outside supply. 20circuits of lights and sockets. Not all could be identified cause the place is so big and those that could, the switchgear had been filled with a resin compound so unable to bridge. Had to use method 2nd I would still be there on the first circuit.

Most of them failed anyway.

 

[malcolmsanford]

I know i'm going to be shouted out here, you ole idjit and all .......but is there a test method 2 for IR? I know there are 2 methods for continuity of conductors which is Method 1 +2 but I always thought there was just .........IR be it 500v Dc to all conductors, and then there is 250v DC to L/N to E, when did we start calling this method 2 .............have I missed something?

 

[Dunc]

Just a quick additional question then. If using method 2 for your IR test how would you record the results on the test certificate? Obviously you would have the same reading for the L-E box as the N-E but would you then leave the L-N box blank as you don't have a value and then make a comment in the agreed limitations box that method 2 was used? Just wandering as most of my work is domestic so don't tend to be left in situations where lamps can't be removed or equipment unplugged/disconnected.

 

[pushrod]

I know i'm going to be shouted out here, you ole idjit and all .......but is there a test method 2 for IR? I know there are 2 methods for continuity of conductors which is Method 1 +2 but I always thought there was just .........IR be it 500v Dc to all conductors, and then there is 250v DC to L/N to E, when did we start calling this method 2 .............have I missed something?

Method 2 - test 2 as it it is called in GN3 - is when live conductors are put in one croc and the cpc in the other, so that a dangerously high voltage is not put across sensitive equipment. ie both line and neutral are at 500V so no current flows across it.

You would just record your results in the live/earth column and record that test 2 only, was being done for insulation resistance in the "extent of installation covered by this report" section.

 

[malcolmsanford]

Thanks push I've not looked at the GN3 for ages but i'll need to do that