Residential Service Relocation

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eddie_kerri

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cincinnati, ohio
I need to relocate an interior 100 amp residential panel to an adjacent wall. The existing romex branch circuit cables are not long enough to extend to the new 200 amp panel I will be installing. I will be using the existing 100 amp loadcenter as a junction box and extending the necessary sized romex cables from the old panel to the new panel, making wire nut joints and splices in the 100 loadcenter . I have several options to do this: I can run conduit and wire accordingly or individual romex wires as needed. What I would like to do to save some money is run multiconductor tray cable from the new panel to the old. I work at a powerhouse and have access to tray cable. I have a nine conductor #12 cable tray cable. I want to use this to account for four 20 amp circuits . The tray cable is multi-colored, but I was just going to tape the neutral cables white on both ends indicating they are neutral conductors. Is cable tray cable permissible to use for this application? Do I have to use romex cable or run pipe and wire?
 
I just did a 100 to 150 resi panel with an existing 1950's or so 6' wire tray, first one I ever saw in 22 years. Took it right out. Hotwire a #6-3 jumper to the new panel then one by one go with romex and J boxes to the new panel and in the top. That way you can take your time without interrupting the power that much. I usually fit 2 romex circuits (14 or 12) in the new j boxes. Bore a few new holes in the joists. I would also advise against using the old panel as a J box, just looks much messier. My 2 cents. Inspectors have always allowed the temporary wiring (jumper) here. Then when the poco does the disco/reconnect you just pull the old jumper and panel and you're all new.
 
eddie_kerri said:
..I have a nine conductor #12 cable tray cable. I want to use this to account for four 20 amp circuits..
Click to expand...

The National Fire Code, NFPA-70, may show several violations here:

1) Re-identifying ungrounded conductors smaller than #6, from same AC Nominal Voltage System, is not permitted.

2) Bundling over 3 CCC's per cable/raceway reduces ampacity 30%. See Tbl 310.15(B)(3) #12 Awg drops to 14-Amps.

3) How are the cable bundled neutrals matched to the proper AFCI or GFCI circuit breakers?

4) Complying with 210.4(D) gets rather messy if any bundled conductors supply MWBC's.

5) Do listed connectors for those 9-conductor #12 cables even exist for fuse box KO's?

6) Is your tray cable listed or labeled for construction installations behind walls, 600vac, and can it handle 60°C minimum sustained temp?
 
ramsy said:
The National Fire Code, NFPA-70, may show several violations here:

1) Re-identifying ungrounded conductors smaller than #6, from same AC Nominal Voltage System, is not permitted.

2) Bundling over 3 CCC's per cable/raceway reduces ampacity 30%. See Tbl 310.15(B)(3) #12 Awg drops to 14-Amps.

3) How are the cable bundled neutrals matched to the proper AFCI or GFCI circuit breakers?

4) Complying with 210.4(D) gets rather messy if any bundled conductors supply MWBC's.

5) Do listed connectors for those 9-conductor #12 cables even exist for fuse box KO's?

6) Is your tray cable listed or labeled for construction installations behind walls, 600vac, and can it handle 60°C minimum sustained temp?
Click to expand...

Right on. Good call.
 
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