Posted by George Marsh on November 06, 2014 at 15:23:22 from (192.182.49.176):
For decades I've wondered why a GFCI will trip if you touch ground to neutral. Both ground and neutral are bonded together to the same point in the load center. GFCI trips when it detects a difference in current between power and neutral. Then today while talking to myself, because no one was around and I wanted to listen to someone talk, Self had an AHA moment. Even though there isn't anything plugged into the GFCI, the GFCI is using power. So, there is current in the neutral and power wire. Shorting the ground to neutral allows some of the neutral current to find it's way back on the ground wire.
To confirm all this I put a short 3 wire cord on a GFCI. Then plugged it into a device that measures watts. Sure enough, 2.6 watts. Not sure of the accuracy of my meter, so you may try the experiment and find something different.
Better not tell tree huggers that GFCIs are using that much power. A billion GFCI's will consume 2.6 billions watts. Is it possible that all this wasted power is causing GOBAL WARMING? George
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Today's Featured Article - Tuning-Up Your Tractor: Plugs & Compression Testing - by Curtis Von Fange. The engine seems to run rough. In the exhaust you can hear an occasion 'poofing' sound like somethings not firing on all cylinders. Under loaded conditions the tractor seems to lack power and it belches black smoke out of the exhaust. For some reason it just doesn't want to start up without cranking and cranking the starter. All these conditions can be signals that your unit is in need of a tune up. Ok, so what is involved in a tune up? You say, swap plugs and file the points....now tha
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