UK Testing

[L1Jay1]

On a continuity test on existing lighting circuit, do all bulbs have to be removed, what if there is to many or some can’t be reached.
Trainee Electrician

 

[telectrix]

you don't remove for a continuity test. but without removing all loads, you can't do a L-N IR test.

 

[L1Jay1]

you don't remove for a continuity test. but without removing all loads, you can't do a L-N IR test.

Are you saying u don’t have to remove bulbs when testing for earth continuity.

 

[telectrix]

no you don't need to remove. you are measuring either R2 or R1+R2. as the bulbs are connected L-N, their resistance will have no effect on your readings.

 

[L1Jay1]

no you don't need to remove. you are measuring either R2 or R1+R2. as the bulbs are connected L-N, their resistance will have no effect on your readings.

no you don't need to remove. you are measuring either R2 or R1+R2. as the bulbs are connected L-N, their resistance will have no effect on your readings.

its just that in college, they said lamps should be remved for R1 R2 test

 

[telectrix]

its just that in college, they said lamps should be remved for R1 R2 test

ask them why.

 

[Midwest]

its just that in college, they said lamps should be remved for R1 R2 test

Perhaps they are teaching you how to conduct the series of tests for an installation, not just continuity. In that case, all loads would need to be removed first.

 

[L1Jay1]

Perhaps they are teaching you how to conduct the series of tests for an installation, not just continuity. In that case, all loads would need to be removed first.

Yeah you’re right, the tests done in college are for a new installation, looks like with a existing lighting circuit, the lamps don’t need removing .

 

[gazdkw82]

During initial verification, r1+r2 or r2 needs to be confirmed at the furthest point. The only way to measure r1+r2 or r2 is physically removing the lamp/cover and gain access to the conductors.

If you are performing r1+r2 this is a good time to confirm polarity too using the light switch.

 

[Risteard]

During initial verification, r1+r2 or r2 needs to be confirmed at the furthest point. The only way to measure r1+r2 or r2 is physically removing the lamp/cover and gain access to the conductors.

If you are performing r1+r2 this is a good time to confirm polarity too using the light switch.

Actually, during initial verification cpc continuity must be verified at all points.

 

[Midwest]

I do like the way some people like to correct other people in terms. Peace on Earth on Goodwill to all Men etc.

 

[ipf]

I do like the way some people like to correct other people in terms. Peace on Earth on Goodwill to all Men etc.

Just to correct you...…..AND goodwill....etc

 

[Midwest]

Just to correct you...…..AND goodwill....etc

Up yours, just edited it

 

[L1Jay1]

I do like the way some people like to correct other people in terms. Peace on Earth on Goodwill to all Men etc.

Actually, during initial verification cpc continuity must be verified at all points.

on lR test do the rcds switched to off .

 

[ipf]

on lR test do the rcds switched to off .

Have you got an RCD warning label to read?
If not, look it up in the regs. or on line, even.

 

[L1Jay1]

Have you got an RCD warning label to read?
If not, look it up in the regs. or on line, even.

I was asking if the RCDs are switched to the off position during insulation resistance test, as I know they are sensitive equipment.
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you don't remove for a continuity test. but without removing all loads, you can't do a L-N IR test.

On IR test can u just switch RCDs off or do u actually have to dis them.

 

[L1Jay1]

I was asking if the RCDs are switched to the off position during insulation resistance test, as I know they are sensitive equipment.
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On IR test can u just switch RCDs off or do u actually have to dis them.

Disconnect them it was meant to say
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I was asking if the RCDs are switched to the off position during insulation resistance test, as I know they are sensitive equipment.
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On IR test can u just switch RCDs off or do u actually have to dis them.

Sorry disconnect them , my post was meant to say.

 

[gazdkw82]

I believe you are correct. I thought it was Zs that had to be proved at every point but yes, I believe it is continuity of cpc at every point.

A Zs wouldn't confirm a cpc is present or that it is a acceptable condition or terminated sufficiently

 

[davesparks]

I believe you are correct. I thought it was Zs that had to be proved at every point but yes, I believe it is continuity of cpc at every point.

A Zs wouldn't confirm a cpc is present or that it is a acceptable condition or terminated sufficiently

You can't carry out Zs until the installation is energised, and you can't safely energise an installation without proving the correct connection of the protective conductor at every point.
This is why the continuity of the protective conductor is tested first.

 

[gazdkw82]

Actually, during initial verification cpc continuity must be verified at all points.

You can't carry out Zs until the installation is energised, and you can't safely energise an installation without proving the correct connection of the protective conductor at every point.
This is why the continuity of the protective conductor is tested first.

Yes exactly. Hence why I realised my mistaken thoughts

 

[telectrix]

During initial verification, r1+r2 or r2 needs to be confirmed at the furthest point. The only way to measure r1+r2 or r2 is physically removing the lamp/cover and gain access to the conductors.

If you are performing r1+r2 this is a good time to confirm polarity too using the light switch.

and if we are correcting posts, it's R1 and R2. not r1 and r2.

 

[gazdkw82]

and if we are correcting posts, it's R1 and R2. not r1 and r2.

Absolutely spot on. Lazy on my part ?