Ground lift

[Joe Louvar]

Exactly my reasoning, but I'm not absolutely sure the GFCI would trip in the case of hot mic or otherwise. Actually I can't think of a reason it would.
Joe-I'm an industrial engineer, not audio.

OP: Think about this - when everything is properly connected and grounded (like it should be), there aren't any problems - no noise, no hot mics, no ungrounded amps, etc - you can even play barefoot. Point being - just properly connect and ground everything like it should be (for-crying-out-loud), instead of trying to provide a solution when there isn't a problem.

Now if you're working at a venue where electrical outlets aren't up to code and or with messed up drug addicts running hot mic's, lifting safety grounds and etc - you need to refuse to play/work, and you really should report the venue to authorities (this is your best and safest solution).

 

[David Jayne]

It definitely won't trip in the case of a hot mic but lifting the safety ground on the amp would remove that path to ground so you wouldn't get a shock unless you were standing barefoot on a concrete and/or wet floor. With the amp's safety ground lifted the GFCI will only trip if there is a fault in your amp that energizes the chassis and you come into contact with a path to ground (assuming enough current flows through you to trip it).

Exactly what I'm thinking.

Now if you're working at a venue where electrical outlets aren't up to code and or with messed up drug addicts running hot mic's, lifting safety grounds and etc - you need to refuse to play/work, and you really should report the venue to authorities (this is your best and safest solution).

I agree with you, Joe. This is just a thought experiment.