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Old 06-16-2011, 09:18 AM   #16
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Extention Cord Dropped into Pool


I'm just trying to learn: If the GFCI won't trip when you drop a hair dryer into the tub, then why have GFCI's ?

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Old 06-16-2011, 09:45 AM   #17
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Extention Cord Dropped into Pool


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I'm just trying to learn: If the GFCI won't trip when you drop a hair dryer into the tub, then why have GFCI's ?
Electricity is used by many but many don't understand it.
For current to flow there has to be a complete path. Birds can sit on a power line and not get shocked because there is no path for current to flow.
A fiberglass bathtub plumbed with plastic pipe is a very poor conductor and therefore doesn't provide a return path for current to follow.
A ground fault receptacle monitors the current in the two straight pins. If it is equal then there isn't a fault. If it is different then current must be flowing through some other path other than the hot and neutral.
By dropping a hair dryer into a bathtub plumbed in plastic there is no "third conductor" and all the current in hot pin can only return through the neutral pin and so there is no fault.
Plastic plumbing has removed many of the ground paths that used to be in a house.
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Old 06-16-2011, 09:47 AM   #18
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I'm just trying to learn: If the GFCI won't trip when you drop a hair dryer into the tub, then why have GFCI's ?
In order for the GFI to trip there must be a ground fault. Hence the name Ground Fault Interupter. The device monitors the current leaving and returning to the device. If it is same, then the sensing circuit does nothing, however, if there is less current returning then leaving then that means it is returning to the the source (grounded side of the service) through another means (ground fault). The sensing circuit senses the unbalance and trips the circuit. If a hair dryer is dropped into the tub and there is no path to ground (all plastic) , the GFI will think it is a nomal load and not open. Since water is not a perfect conductor (it offers some rsistance) the breaker will not trip either. That is why all all hand held bathroom type appliances (hair dryers, curling irons, flat irons) have immersion detection devices (the little box with the test/reset button) on it).
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Old 06-16-2011, 12:03 PM   #19
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Extention Cord Dropped into Pool


So can i sit in a plastic bathtub full of water with the hairdryer with me? What good is a GFCI in a bathroom?
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Old 06-16-2011, 12:19 PM   #20
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So can i sit in a plastic bathtub full of water with the hairdryer with me? What good is a GFCI in a bathroom?
Since the electrical code doesn't dictate the plumbing code, it is entirely possible to have copper pipes supplying the water. The NEC establishes a minimum for safety. Having a GFCI doesn't hurt anything either.
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Old 06-16-2011, 01:40 PM   #21
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So can i sit in a plastic bathtub full of water with the hairdryer with me? What good is a GFCI in a bathroom?
SO when you grab the hair dryer with one wet hand and the bathroom sink faucet with the other you don't get knocked on your a$$.
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Old 06-16-2011, 02:42 PM   #22
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Extention Cord Dropped into Pool


I see the situation, the NEC and Plumbing Code are completely seperate. There is no way to know if the plumbing will complete the electrical path (plastic pipe vs. metal pipes).
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Old 06-16-2011, 03:47 PM   #23
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Extention Cord Dropped into Pool


take down your electric meter reading ##### might of drained some amps/watts but not enough to trip like running 2 hvac systems till you pulled it out..bill next month will tell ...rubber pool liner insulated the 115V from a grounding drain trip.see any dead flies in the pool
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Old 06-16-2011, 11:03 PM   #24
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Extention Cord Dropped into Pool


most people dont know this but,
Fresh clean water is NOT a good conductor of electricity,
So how much current flows depends on how much impurities,
or salt was in the water.
Saltly water IS a good conductor.
So the water the lead fell into was probably low in impurities
and or salt.
So not much current was flowing.
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Old 06-17-2011, 06:11 AM   #25
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Extention Cord Dropped into Pool


good one low salt or dirt and the rubber liner no drain out
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Old 06-17-2011, 07:34 AM   #26
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Extention Cord Dropped into Pool


I did find the problem. The GFCI near the front door had tripped, once I re-set it the plugs around the pool started working again.
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Old 06-17-2011, 07:37 AM   #27
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I did find the problem. The GFCI near the front door had tripped, once I re-set it the plugs around the pool started working again.
That is one lucky dog
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Old 06-18-2011, 01:13 PM   #28
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Would the dog really have been killed had the GFCI not tripped?
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Old 06-18-2011, 07:28 PM   #29
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Extention Cord Dropped into Pool


ahh.. can't be that bad~?


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