Quick continuity question

[JakeC]

I'm studying the the Inspection and Test exam and just ran a continuity test between L + N on a downstairs lighting circuit and got the result 62.9 Ohms. Is this in the ball park as I'm not sure what figures to expect.

Thanks

 

[goldie]

Check the lead resistance of your leads on your test instrument, This is quite a high reading, make sure all terminations are tight but dont overtighten. I often get around 1 ohm on a lighting circuit at the furthest point. What readings u getting between l+e and n+E?

 

[JakeC]

0.25 ohms through the test leads. It's 69 between line and neutral.. I'll check neutral to earth tomorrow it's getting dark now

 

[thomasn]

Hi where did you take your measurement and why? It sounds as if you were measuring all the connected loads etc

 

[goldie]

Leads are ok then, Make sure you take the lamps out it you require l-n continuity aswell.

 

[ipf]

Lamp testing ?

 

[telectrix]

Hi where did you take your measurement and why? It sounds as if you were measuring all the connected loads etc

taht's what i thought. are the Land N shorted at CU for this rerading?

 

[trev]

I'm wondering what the point of the test was.

 

[JakeC]

Ah I've realised now what I've done wrong. I was measuring at the consumer unit D'oh. (first day practical)

Is this right..

Tempory link between L + N then measure at all switches and take highest reading? Then do the same for N + E?

Thanks

 

[JakeC]

I'm wondering what the point of the test was.

Just practice.. With safe isolation of course

 

[trev]

Are you sure you're not after (R1+R2) mate? I'm at a loss to understand why you're carrying this test out and what you hope to achieve by it

 

[Ponty Massive]

Normally you'd do a IR test between the L-N to check for insulation with all lamps removed.

R1 + R2 test between L-E

 

[trev]

If it's practice you're after why not do the full proper test procedure in it's correct order?

 

[JakeC]

That is what I am doing starting with continuity then moving onto IR think I've just got the 2 mixed up abit. I am after R1+R2 so L+E?. Sorry for the confusion getting ahead of myself.

 

[trev]

When you're done playing with your test kit get your head into GN3. The more familiar you are with it the easier the exam will be
Best of luck to you for it