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your right in that it stands for ground, and also right in that most of the equipment doesn't have a ground.
A little off topic but a gfci monitors current in and out on hot and neutral (simplistic terms, there is no in and out etc) if more goes out then comes back on neutral, usually do to a short to ground, then it trips. This explain why a gfci would trip upon the addition of a ground rod. but the problem existed before it. The more grounds the safer. |
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Just my speculation here and I could be totally wrong, but it's the only explanation that makes sense to me. I suspect that in the case of your powerhead there was some degree of deterioration of the insulation waiting to find a path to a lower potential (ground if you wish). Although you felt a shock, your body resistance was likely too high to cause enough current to flow to trip the device, i.e. it was not enough to harm you. By introducing the grounding probe (much less resistance to ground than your body), sufficient current was able to flow from the faulty powerhead to ground tripping the GFCI. It's great that you were able to isolate the faulty device by installing the ground probe before it became bad enough to trip the GFCI with your hand in the water.
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Mike 77g sumpless SW DIY 10 watt multi-chip LED build http://www.canreef.com/vbulletin/showthread.php?t=82206 Last edited by mike31154; 12-29-2010 at 06:27 AM. |