Stray Voltage?

[syncro]

Originally Posted by TheNewGuy

A ground probe in a tank with stray voltage induced through powerheads, heaters ect, will turn stray voltage into current. and if the current gets high enough will trip a GFCI

Can powerheads induce enough current to trip a GFCI (5mA)?

How does a heater induce current? Does it have something to do with the heating coil? I understand powerheads induce current by creating a moving magnetic field.