Posted by John T on March 27, 2013 at 06:42:25 from (66.87.0.204):
In Reply to: WT? Anyone seen this? posted by JF in CT on March 27, 2013 at 05:47:04:
As you found, theres the normal resistance between the Hot and Neutral (A GrounDED Conductor) that's the continuous path that produces resistance heat butttttttttttt there shouldn't be a current path from EITHER conductor to the case/frame cuz that means there's a shorting current conducting path and if its as low as around 5 milliamps the GFCI does its job and trips, that's NOT a bad GFCI that's a GOOD GFCI doing its job to save a life or prevent a fire.
Now, ifffffff the heater is equipped with the third wire safety Ground (A GroundING Conductor) which is then effectively wired to the engines case/frame and the coolant in which the heater is immersed somehow (short or leak etc) were to allow 5 milliamps of return current to flow OTHER THEN VIA THE NEUTRAL that again trips the good working GFCI....
SOOOOOOOO as you have discovered any leaks or shorts in a defective heating unit is gonna trip the GFCI grrrrrrrrrrrrr Ive been there n done that, hard to find a good quality long lasting unit.
I as a retired electrical engineer just cant in good faith and conscience recommend cutting off third wire GroundING circuits even in cases where such may or may not (depends on circumstances) allow a device to work, but its your tractor your life and your choice so keep safe best wishes God Bless and good luck.......
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