I do that but, as lamps are unreliable and can blow at any secons, I turn the circuit on again just to check, then off. Several times I've used a mains radio in the same way where line of sight was an issue.
I find a "volt stick" much easier (check before and after that it is working via a socket or suitable mains lead)
A couple of weeks ago I tested a circuit was live, removed the "suggested" fuse, checked that the circuit was dead and then checked the tester was still working on another circuit. All OK
Bloody apprentice destroyed my hacksaw blade when he chopped through the live armoured cable:-)
It turned out that one of the leads on the tester was faulty and it had shown dead when it should not have done.
And a volt stick is no use on an armoured cable.
Neutral is generally earth or earthed so it /shouldn't/ be able to get particularly high.
I'll happily pull a fuse or trip the MCB but behave as if I'm dealing with a live live.
Scott
For a TT supply you are supposed to switch the neutral on the circuit you are working on.
Much depends on your view of the world and how much work you are doing and whether anyone else is liable to do something stupid. If I was alone then I'd just pull the fuse, but if others are about, Id bloody well switch of and tape a huge sign over the switch saying please do not throw this switch or similar!
Brian
Some do some don't, strangely some really old ones do disconnect the neutral. Not seen the current crop for obvious reasons. I guess its all fine unless there is a strange event.
Brian
I nearly put a caveat for TT, but settled on "generally" as I don't know the regs. I shall mentally file that piece of info (or just read the bloody regs one day, but there's only so many hours in the day ;-) )
Scott
Note the words "supposed to isolate":-)
Only the pen pushers care about it.
I think .. with those apprentices you'll be on a murder charge one day 'ere long;!..
Course we'll all come as character witnesses to say you were provoked beyond reasonable human endurance;!..
Do any of them ever graduate at all?...
ARW :
Best to test the tester on a known live circuit after testing the hopefully dead circuit.
The rule is "get someone else to do it". They are diesels and turning the ignition off doesn't stop it firing.
That's what I did.
"A couple of weeks ago I tested a circuit was live, removed the "suggested" fuse, checked that the circuit was dead and then checked the tester was still working on another circuit. All OK"
They do. And it is nice to see them graduate.
En el artículo , snipped-for-privacy@gmail.com escribió:
I would. It has to be double pole.
En el artículo , Ivan Dobsky escribió:
Most installations are T-N-C-S, so neutral and earth are the same at the supplier main fuse. To energise the house neutral, you would also have to have an earthing fault. Can't see that being likely.
Me too. Small chance that my test device will fail at the exact moment I pull the fuse.
Andy
Oops, so you did. Intermittent faults are a bugger.
Ever seen a house with a T-N-C-S supply that was wired with the L and N meter tails reversed into the consumer unit?
I have. It was probably in that state for many months, possibly even a few years. Everything in the house 'worked' but there were lots of weird effects with neon indicators on sockets that came on when the switch was turned off. Not sure if you'd class it as an earthing fault though :)
There's still lot to be said for a neon screwdriver - used sensibly and knowledgeably.
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