My question concerns the issue of EGC sizing per Art. 250.122(F) when running parallel multi-conductor armored cables. The EGC in a stock cable will likely be undersized when paralleling for current carrying capacity (as opposed to paralleling for voltage drop considerations). Is there any alternative to special ordering cable with an up-sized EGC?
EGC Size in Parallel Multi-Conductor Cables
- Thread starter bozo
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- Massachusetts
Re: EGC Size in Parallel Multi-Conductor Cables
250.122(F)(2)
Yes use a GFP breaker as the overcurrent protective device.
250.122(F)(2)
- Location
- Massachusetts
Re: EGC Size in Parallel Multi-Conductor Cables
If this is a single phase feeder I would say simply order 4 wire cable and re-identify the blue to green or bare.
If it is a 3 phase 4 wire feeder I doubt anyplace will stock what you need.
You will have to compare the cost of custom cables, GFP protection or running conduit.
[ April 29, 2005, 05:12 PM: Message edited by: iwire ]
If this is a single phase feeder I would say simply order 4 wire cable and re-identify the blue to green or bare.
If it is a 3 phase 4 wire feeder I doubt anyplace will stock what you need.
You will have to compare the cost of custom cables, GFP protection or running conduit.
[ April 29, 2005, 05:12 PM: Message edited by: iwire ]
Re: EGC Size in Parallel Multi-Conductor Cables
Circuit in question is 480V 3phase motor branch circuit. Running MC cable in tray. Wouldn't have thought of using 4 conductor and using spare circuit conductor for EGC. Duh. Sounds like the best solution. Appreciate the help. Thanks.
Circuit in question is 480V 3phase motor branch circuit. Running MC cable in tray. Wouldn't have thought of using 4 conductor and using spare circuit conductor for EGC. Duh. Sounds like the best solution. Appreciate the help. Thanks.
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