Fused EGC

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Re: Fused EGC

Originally posted by shortcircuit2:
Iwire...as for landing a EGC on the fused block of that disconnect, 250.8 would be one code section selection that make that disconnect non- compliant with the NEC...

shortcircuit2
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I do not see how 250.8 is relevant here. :)
 
Re: Fused EGC

I feel that putting a fuse on the EGC is an EXTREMELY bad idea. This could result in a potentially hazardous situation, involving the equipment and every person around it. To me this is an accident waiting to happen.
 
Re: Fused EGC

Peter,

Take a look at the last sentence:
If the terminal for the equipment grounding conductor is readily removable, the area adjacent to the terminal shall be similarly marked.
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Most disconnects use this type of identification.
 
Re: Fused EGC

By Dave: 250.124 (B) (B) Switches. No automatic cutout or switch shall be placed in the equipment grounding conductor of a premises wiring system unless the opening of the cutout or switch disconnects all sources of energy.

The "automatic cutout" is the fuse. If this were a breaker, it would be OK by this code reference.
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If it was a breaker it would still be disallowed look at this found in the definitions of 100:

Automatic . Self-acting, operating by its own mechanism when actuated by some impersonal influence, as, for example, a change in current , pressure, temperature, or mechanical configuration.
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Circuit Breaker . A device designed to open and close a circuit by nonautomatic means and to open the circuit automatically on a predetermined overcurrent without damage to itself when properly applied within its rating.
FPN: The automatic opening means can be integral, direct acting with the circuit breaker, or remote from the circuit breaker.
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Switching Device . A device designed to close, open, or both, one or more electric circuits.

Circuit Breaker . A switching device capable of making, carrying, and interrupting currents under normal circuit conditions, and also of making, carrying for a specified time, and interrupting currents under specified abnormal circuit conditions, such as those of short circuit.

Cutout . An assembly of a fuse support with either a fuseholder, fuse carrier, or disconnecting blade. The fuseholder or fuse carrier may include a conducting element (fuse link) or may act as the disconnecting blade by the inclusion of a nonfusible member.
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Both breaker and cutout are listed under "switching devices"

250.124(B) is the code I would use to not allow this installation, as well the definitions.

[ October 19, 2005, 12:03 AM: Message edited by: hurk27 ]
 
Re: Fused EGC

Originally posted by websparky:
Bob,
First:
250.124 (B) (B) Switches. No automatic cutout or switch shall be placed in the equipment grounding conductor of a premises wiring system unless the opening of the cutout or switch disconnects all sources of energy.

The "automatic cutout" is the fuse.
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I'm with Dave here :) .
 
Re: Fused EGC

I skipped thru most of this unusual subject, somebody else may have well brought this up, but here goes. What if some dunderhead comes along, finds one of the fuses blown on the hot leg and instead of replacing it with one from his truck, swaps it out with the center fuse?. Code or not, any good attorney lives his whole life wishing for stuff just like this to float down from heaven his way.
 
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