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What makes mics hum-sensitive?

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Hi all,
I was wondering what makes a mic hum when I approach the swtiches, and pick up low level background hum that no other mics do.

I've been able to rule out ground loops, and I am using very well shielded cable. The body is screwed together very tighly, so there's no problem there.

Oh yeah, the mic also needs to be grounded to stop the hum getting very bad.