CL According to barry martin :
CL The problem is a bad contact in the circuit. If your house is older
CL it may be the springy flat piece of metal at the base of the light
CL fixture isn't making good contact. WITH THE POWER OFF to the light
CL fixture take a small screwdriver or something similar and pull the
CL springy contact out about an eighth of an inch. Replace the lightbulb.
CL (It is a good light bulb, right? They can be bad directly out of the
CL box.)
CL
CL As a reminder, "WITH THE POWER OFF" means turn off the corresponding
CL breaker or pull the corresponding fuse.
CL
CL Sticking a screwdriver into a lightsocket isn't the time to find
CL out that the electrician is switching the neutral, not the hot
CL wire. It happens.

Yes. The light switch alone will interrupt the circuit but may have
been accidentally wired to the neutral, even though it is a wire with
black insulation around it. While a light bulb may not work someone
working on the circuit standing on a metal ladder in stocking feet
might make a good conductor.

And yes, I have worked on circuits using just the wall switch to power
off the circuit. Previously have checked the circuit was wired
correctly. Also have put tape over the switch even when no one else
was home -- can absent-mindedly flip a switch on out of habit (gee
it's dark in here -- ZAP!!) Ever flip the light switch on during a
power failure?!

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¯ barry.martinþATþthesafebbs.zeppole.com ®

* Paradox \par'-u-doks\: two physicians
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