OK it's Friday night and I really have got better things to do other
than to sort out a friends lighting problem!
This is the situation. New place, just moved in, toilet light not
working, so change bulb ....nothing. Check bulb, thats OK. Check power
with non-contact power tester, indicates power BUT all the time
regardless of switch position. Checked tester on other appliances etc
and all ok there.
So, power + good bulb = no light!
I suspect a switch problem of some sort, any ideas or suggestions?!
Will try a new pull switch in the morning, but would be interested to
hear your thoughts :-)
If the live is there (a volt stick would tend to confirm it), then the
neutral is missing. Another possibility is poor connections around the
A volt stick in the hands of a practised user can be used to check for
the lack of a neutral - When testing a two core flex, it will light up
when moved around the entire circumference if the neutral is missing.
If both live and neutral are there it will only light up on part of the
circumference. you can restrict the sensing range/angle of a stick by
screening the tip between your finger tips.
Your 'power tester' may indicate many different things!
As has been discussed, there may be L at the light fitting, but no good N.
Also, there may be a poor contact causing high resistance between the supply
and the light fitting. Under no-load conditions, 240v will be present at
the fitting. With the lamp installed creating load conditions, theis
voltage may drop right down.
There's no substitute for a good meter, and the knowledge to interpret the
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