@ryanc could also be the return contact of some device. did you check which voltage it yields against different potentials? (prot., gnd. different ac power) use a voltmeter, and be sure to only touch it with a pliers.
@ryanc could also be the return contact of some device. did you check which voltage it yields against different potentials? (prot., gnd. different ac power) use a voltmeter, and be sure to only touch it with a pliers.
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