cpc continuity test

[ezekiel]

is there a specific trailing lead to test main bonding etc or can you just use a length of wire? if so does its resis need to be removed? or is there a better way, and what sort of reading is accepted

 

[ban-all-sheds]

AFAIK most people make up their own. It should be as flexible as possible - if you can get proper test lead cable that's ideal.

And yes of course it's resistance needs to be taken into account, but most testers have a function to null out the lead resistance.

 

[ezekiel]

had a look about but cant find one - any ideas who supplies them?
and is it a case of attaching it to croc clip on tester lead if you just use wire

 

[Veglen]

Sounds like you are referring to either a megger extension lead or a wander lead. Try googling 50metre Wander lead it may be what you are looking for.

V

 

[holmslaw]

..

 

[ezekiel]

Next time your in a wholesaler ask him what is the cheapest roll of single core stranded cable and then buy it.

sounds like a plan just found a kewtech wander lead and still recovering from the price

 

[GaryMo]

sounds like a plan just found a kewtech wander lead and still recovering from the price

I bought one with company credit card though haven't used it yet.
Looks nice though

 

[RF Lighting]

Wire a plug and trailing socket with just an earth wire, and then attatch it to this:

 

[Click-Sure]

I've got the Kewtech R2 50m wander lead and I find it about as invaluable as my loft light, don't use that often but invaluable when I need it.

Its got a higher resistance than i would expect tho.

 

[Taylortwocities]

It doesnt matter what the wander lead resistance is if you null your test meter before doing the continuity test.

 

[Click-Sure]

Yep, the megger remembers it too, its never been a problem, just higher than expected, thats all.

 

[ezekiel]

finally got round to buying a meter so starting to practice with testing - first stop continuity testing, hence the original question, any further info on this test appreciated

 

[Spark123]

What sort of further info?
Like you need to isolate the main incoming supply and disconnect the MEB from the pipework before measuring the resistance of the MEB? Should be no greater than 0.05ohms. MEBs must be reconnected before supply is energized.

 

[ezekiel]

had a go at first cont. test at home ran into few probs can use some input :

Main bond = o.13 ohms
lights upstairs (link cpc+line) 0.75 ohms polarity ok (is this also r1+r2)
lights downstairs 0.43 ohms polarity ok (as above)

ring main had trouble with:
line/line 0.54 ohms
neut/neut 0.62 ohms
cpc/cpc 0.98 ohms (why more thought it would be less?)

tested at all sockets and getting >2000ohms (no idea why)

 

[davelx]

.
lights upstairs (link cpc+line) 0.75 ohms polarity ok (is this also r1+r2)
.
cpc/cpc 0.98 ohms (why more thought it would be less?)

strictly, it's R1+R2, not r1+r2, which are used for ring final conductor values.

Why? Think about what resistance is for a moment, and what factors affect the resistance of a cable. It'll come to you.

Also - that discrepancy between r1 and rn is quite high (15%) - you just might have a less than perfect N connection on the back of one of the sockets