On 10/03/2012 08:05, ss wrote:
On 10/03/2012 01:47, Bill Wright wrote:
Frank Erskine wrote:
On Fri, 9 Mar 2012 23:58:49 -0000, "Road_Hog"
wrote:

Was in Morrisons today and they had these on the end of aisle display
(where they have bits of hardwear). Only 87p, not on special, just
marked up as 87p.Not bad if you need a mains tester.

Nasty dangerous things. Avoid.

Bill
As a non electrician I would have thought it could add another bit of
safety. Even to change a socket I have to put the mains ring off then
check the socket is not live then I panick and put the complete mains
off then usually get my wife to double check and at that I still try and
avoid touching a wire while changing it.
But with one of the neon testers then if it lights before switching off
then doesnt light after switching off surely adds another safety zone.

But would be interested in the whats `nasty & dangerous` part.

I suspect you will get a few bites on this ;-)

Now, where does one start...

The main problem is that they give both false positives and false
negatives. Hence if you rely on them you can end up thinking a
de-energised circuit is still live, or more worryingly, end up believing
a live circuit is safe.



--
Cheers,

John.

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