Lars,
to check the leak resistance of mains circuits you need a special
"megger"meter.This is usually in the range of Mohms, so usually a normal
multimeter shows infinite resistance (sometimes modern digital ones are
capable of measuring this resistance).It's very dangerous to use something
that gives you (even) a slight shock.If you find it's too much money to have
it professionaly repaired (maybe a worn out cable that touches the frame?)
then better trash it, than put your life in danger.
--
Tzortzakakis Dimitrios
major in electrical engineering, freelance electrician
FH von Iraklion-Kreta, freiberuflicher Elektriker
dimtzort AT otenet DOT gr
Ο "Lars" έγραψε στο μήνυμα
...
My electrical theory is fair but not great. Can someone please
advise me.
I have an old Anglepoise lamp with painted metal arms and painted
metal lampshade (Anglepoise model 90). It has a two-core mains
lead. I am in the UK so this is all at 230-240 volts.
Today I touched the outside of the lampshade and got a sort of vey
mild tingle feeling which felt "odd". When I used a mains tester
screwdriver on the exposed metal (at the joint of the lampshade
and support arm) then it glowed as if the metal of the Anglepoise
lamp was live.
I unplugged the lamp and tested the resistence between the live
pin on the mains plug and some exposed metal on the lamp. I got
no resistence reading at all (i.e. it must have been a very high
resistence). I then tested the neutral pin in the same way and
got the same high resistence result.
So the lamp seems ok. But something seems to be wrong!
QUESTION: Is my lamp safe to use and could I get a shock from it
in its present condition?
QUESTION: If my lamp is unsafe then is there a repair I can do?
Thank you for any info.
Lars
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PS: Picture of Anglepoise model 90:
http://www.anglepoise.com/timeline/model_90.jpg