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#1
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Does GFI makes equipment ground obsolete?
If an outlet is GFI, does equipment ground still serve any useful purpose?
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#2
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Does GFI makes equipment ground obsolete?
On 2006-07-17, peter wrote:
If an outlet is GFI, does equipment ground still serve any useful purpose? Yes. With an EGC, equipment that develops an internal ground fault (e.g. to the chassis) will trip the breaker. With a GFI only, the equipment chassis will remain hot until someone comes along and provides a path ground to trip the GFI. Also, redundancy usually improves safety. GFIs fail alot more often than the EGC. Cheers, Wayne |
#3
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Does GFI makes equipment ground obsolete?
Appreciate the multiple purposes of that wall receptacle ground. An
obvious and original purpose is to short out a circuit that would otherwise cause human electrocution. This is essential for appliances that have exposed conductive (metal) parts. GFCI (that has not been damaged by surges) also does same function. Interconnected electronics also need (should have) a common ground connection. Again, the equipment ground accomplishes that so that voltages between appliances do rise above 30 volts and so that AC leakage has a path to bleed off to. Two reasons provided. peter wrote: If an outlet is GFI, does equipment ground still serve any useful purpose? |
#4
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Does GFI makes equipment ground obsolete?
On Mon, 17 Jul 2006 15:47:06 GMT, Wayne Whitney
wrote: On 2006-07-17, peter wrote: If an outlet is GFI, does equipment ground still serve any useful purpose? Yes. With an EGC, equipment that develops an internal ground fault (e.g. to the chassis) will trip the breaker. With a GFI only, the equipment chassis will remain hot until someone comes along and provides a path ground to trip the GFI. Also, redundancy usually improves safety. GFIs fail alot more often than the EGC. Because GFI's have to do something, something mechanical I think, for them to work. The equipment ground is just a wire connected to the chassis. It's there all the time. Also, who can be sure that one will always use any electrical device from the same outlet all the time? (unless it's a furnace or water heater, or ok, ok.... These aren't GFI outlets anyhow, iiuc.) Cheers, Wayne |
#5
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Does GFI makes equipment ground obsolete?
On Mon, 17 Jul 2006 18:26:49 -0400, mm
wrote: On Mon, 17 Jul 2006 15:47:06 GMT, Wayne Whitney wrote: On 2006-07-17, peter wrote: If an outlet is GFI, does equipment ground still serve any useful purpose? Yes. With an EGC, equipment that develops an internal ground fault (e.g. to the chassis) will trip the breaker. With a GFI only, the equipment chassis will remain hot until someone comes along and provides a path ground to trip the GFI. Also, redundancy usually improves safety. GFIs fail alot more often than the EGC. Because GFI's have to do something, something mechanical I think, for them to work. I'd guess a latching relay that can be put in one position electrically (tripping), but requires mechanical action (reset button) to return to the other state. The equipment ground is just a wire connected to the chassis. It's there all the time. Also, who can be sure that one will always use any electrical device from the same outlet all the time? (unless it's a furnace or water heater, or ok, ok.... These aren't GFI outlets anyhow, iiuc.) Cheers, Wayne -- Mark Lloyd http://notstupid.laughingsquid.com "Democracy is two wolves and a lamb voting on what to have for lunch. Liberty is a well armed lamb contesting the vote." - Benjamin Franklin |
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