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Andrew Gabriel
 
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Default Safely discharging a capacitor

In article .com,
"paulfoel" writes:
Going to attempt to change the capacitor on my tumble dryer... Its a 8
micro-Farad one.

I think its dead anyway but I'm assuming I can check with a multimeter?
What sort of voltage/current is one of these likely to have?

Assuming it is still ' live' how do I discharge it to make it safe?


Most likely it is discharged through the motor windings unless
the switching is such that it gets disconnected, although
relying on the motor windings being intact is not smart when
the thing is known not to be working properly. Secondly, it
probably has a bleed resistor built in, although those can
fail too. I would probably just short it out with a screwdriver,
although that can in theory damage the capacitor. Leave it for
at least 5 minutes since last powered up, and then short out,
and you'll be fine. Making up a proper resistive discharger for
this one occasion just isn't worth it.

--
Andrew Gabriel