A user's problem as below:
We bought an older pendant light for our flat, with a two prong plug. Rather than rewiring it in to the existing outlet, I just bought one of those $2 lamp socket outlet adapter. To be on the safe side, I checked it with my contact volt tester, which lit up when it came within a few inches of the unit (not even in contact).
I plugged the pendant in to a standard wall fixture and all was fine (no charge on the casing, the tester only lights up with contact on the cable). What's more, when I plugged our bedside lamp in to the ceiling adaptor the same problem happened - a good 2-3 inches out of the fluke lighted.
Can there be something about those outlet adapters which may be causing the pendant and lamp to be live? Or probably the ceiling lighting fixture is rated too high for the pendant and lamp?
Another possibility not yet mentioned is that their some kinds of light buttons may 99.9% interrupt current whilst still being let from a small residual amount. This is particularly true of electronic dimmers that do not work with a neutral connection (many need a tiny amount of power for their control circuitry) and for self-illuminated light switches. When using such a light switch, it would be normal for an open circuit to read "hot" all the time, but adding any sort of load should eliminate that effect. As an example, if you were to plug in a lamp then its power cord may read as "hot" when the two lamp and the wall switch are "off", but switching on the switch to the lamp itself should cause it to cease reading "hot" when the wall switch isn't on; turning on the wall switch should then cause it to read "hot" while also making the lamp glow.If things behave as described here, particularly if the wall switch is an electronic dimmer or a self-illuminated model, that would suggest that everything is fine.
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