hooch wrote:
I have two halogen bulbs on the same lighting circuit (240V - UK)
controlled by the same two switches, i.e, either switch will turn on
or turn off both lights. Recently one of the two bulbs died (open
circuit, as expected), causing the fuse / circuit breaker to trip.
Can anyone offer an explanation?

I have read that filament-type bulbs will sometimes arc when the filament
opens, and that the arc can draw a whole lot more current than one would
expect.

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