Posted by John T on November 18, 2012 at 07:52:53 from (216.249.82.117):
In Reply to: Re: Electrical question posted by Oliver Power on November 18, 2012 at 04:38:04:
Good Morning Oliver, I have a friendly and hopefully helpful comment on your statement: "Run a wire from frame of table saw to ground (cement floor, dirt, etc.). I use to do it all the time when working outside in elements."
While its true, that may indeed prevent you from feeling any shock THAT DOES NOT CURE THE HAZARDOUS PROBLEM if a hot wire is shorted the the metal case/frame. It stops the shock because theres a very low resistance and low voltage across the wire you ran to ground thats in paralell with your body.
WHAT REALLY NEEDS TO BE DONE TO STOP THE SHOCK AND MAYBE SAVE YOUR LIFE is run a third wire Equipment GroundING Conductor (usually bare or Green) from the device back to the Equipment Ground Buss in the Panel. That way the FAULT CURRENT caused buy a hot wire against the case/frame has a low resistance path back to the panel so the breaker can trip, de energize the circuit and save your life. The earth or concrete ect alone (i.e. no copper ground wire)is usually too high of a resistance to allow enough current to flow that trips say a 20 amp breaker so the case/frame remains HOT and you could still be killed since that only takes maybe 30 to 50 milliamps of current thru your old ticker ouchhhhhhhhhh.......
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