Grounded conductor...

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1793

1793

Senior Member
Location
Louisville, Kentucky
Occupation
Inspector
Customer wants to remove the FPE panel, 125 amp, flush mount, from the basement to the outside, brick wall. There are about 10 - 120v circuits and 3 - 240v circuits.

I?m planning on gutting the FPE and convert to j-box. I may have to use the original conduit to get from the new panel to the old, 1-1/4? EMT. I?m concerned about the best way to get the grounded conductor from the new to old panel. I would like to avoid pulling in a separate neutral for each circuit de-rating issues and material.

Thoughts:
1) Pull a grounded conductor, the size of the Service (125 amp) to the Neutral bar of the old panel, with all bonding removed, from the FPE cabinet. Then connect all neutrals to the ?floating? neutral bar.

2) Pull a neutral for every two ungrounded, MWBC, then the neutral would not be a CCC and I could then, if necessary, use two different conduits to connect the new with the old. This might help with the de-rating issue.
 
I would like to run 1 conduit and I believe I'll have more that 9 CCC so my de-rating will be at the 50% and that is not acceptable.

If I make two runs then I need an neutral, grounded conductor, in each conduit.

I just got a call form the meter locator and he is telling me I have to move the Service to the other side of the house.
 
1793 said:
I would like to run 1 conduit and I believe I'll have more that 9 CCC so my de-rating will be at the 50% and that is not acceptable.

If I make two runs then I need an neutral, grounded conductor, in each conduit.

I just got a call form the meter locator and he is telling me I have to move the Service to the other side of the house.
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Why can't you run a #6 or #8 in each conduit and separate the circuits. Either way I don't like the install. With the 220's and all you will still have a large derating to deal with.
 
1793 said:
I would like to run 1 conduit and I believe I'll have more that 9 CCC so my de-rating will be at the 50% and that is not acceptable.

If I make two runs then I need an neutral, grounded conductor, in each conduit.

I just got a call form the meter locator and he is telling me I have to move the Service to the other side of the house.
Click to expand...
If the conduit between the panels is 24" and a less it is a nipple and no ampacity adjustment is needed.
 
tom baker said:
If the conduit between the panels is 24" and a less it is a nipple and no ampacity adjustment is needed.
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This might become my best option now that the meter is being relocated form its original place.

stickboy1375 said:
Would it not be easier and cheaper to just install a disconnect at the meter and run 4 wire ser to the existing location and just replace the panel?
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The panel is currently located in the Laundry room with the dryer directly under the panel and there has been a wall constructed that is actually covering part of the panel cover.

Still might have to look into this option as well.

Man, I love this work.;)
 
1793 said:
The panel is currently located in the Laundry room with the dryer directly under the panel and there has been a wall constructed that is actually covering part of the panel cover.


Man, I love this work.;)
Click to expand...
Well great, you can have it.:)
 
Jim W in Tampa said:
You now need AFCI as well
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Good point. I'll have to investigate but I don't think we have adopted 2008 in its entirety. I have done other panel changes and was not required to change any breakers, bedroom AFCI and the like.
 
Jim W in Tampa said:
Part of his circuits are the panel and breakers.I think he will be required to do it.
Click to expand...

Some areas do require using arc faults on aservice change, however I think that is not appropriate.
 
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