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Hi folks, could I have some advice please? I have 12 volts between the (presumably earthed?) metal cooker extractor hood and the earth of a wall socket. This rises to 20 volts when the fan and light are switched on. Yet when I connect a test lamp (no matter whether 3V or 12V or 240V) in parallel with the voltmeter, the voltage drops to zero, and the lamp remains completely unlit. I don't understand what's going on. Is this some sort of induced voltage on the cooker earth?
(a) Is this dangerous?
(b) What is causing it?
(c) How do I stop it?
Many thanks.
(a) Is this dangerous?
(b) What is causing it?
(c) How do I stop it?
Many thanks.