- Location
- Placerville, CA, USA
- Occupation
- Retired PV System Designer
If you qualify to use the tray itself as the EGC you may not have that problem.
300.3(B)
- Thread starter m sleem
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- Location
- Illinois
- Occupation
- retired electrician
It is my opinion that you can only do that where you are installing single conductors in the cable tray. If you are installing a multi-conductor cable, you need an EGC in each cable.
- Location
- Placerville, CA, USA
- Occupation
- Retired PV System Designer
OK. And (somewhat strained example) if you pulled NM through a metallic raceway you would require the EGC to be part of the NM, I assume?
- Location
- Illinois
- Occupation
- retired electrician
I guess I need to retract my statement based on 300.3(B)(3). That would clearly apply to the NM and may apply to the cable in the cable tray based on that cable having a nonmagnetic jacket.
- Location
- Placerville, CA, USA
- Occupation
- Retired PV System Designer
I think that, at least looking at the physics, the magnetic versus non-magnetic jacket is s critical point. Good catch.
Would that mean i cannot use the 4 cores (3ph+n) multi-conductor cable either in parallel or single connection?!!!!!!!!!!
hmy:
IMO you can run single or parallel 4/C (without EGC) and separate single EGC in cable tray. In fact, if the cable tray qualifies as an EGC, you don't have to run any with the conductors, no matter what te wiring method is. If the cable tray does not qualify as an EGC... you can run a separate single wire-type EGC to cover all the conductors in the tray.Would that mean i cannot use the 4 cores (3ph+n) multi-conductor cable either in parallel or single connection?!!!!!!!!!!
And I emphasize that is only concerning the cable tray. Once the conductors or cables leave cable tray, you are require to meet the non-cable-tray EGC requirements as appropriate for the wiring method.
Where you drop out of the tray into conduit, the cable will be required to have an EGC within. The only way to not have to have an EGC in the multi-core cable is if you run tray all the way to the panel.
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I agree and that also agrees with post #7.
Ummm... it doesn't agree with post #7 unless you run single conductors in the drop conduit. Debatable whether stripping the jacket off the cable qualifies, but it does IMO if you use a cable gland or other cable [jacket] termination at the tray to conduit transition.
- Location
- Illinois
- Occupation
- retired electrician
What type of jacket does the multi-conductor cable have? If the cable has a magnetic jacket, then all of the circuit conductors and the EGC have to be within that jacket, and if the cables are in parallel the EGC will have to be larger than what would be in a standard multi-conductor cable.Would that mean i cannot use the 4 cores (3ph+n) multi-conductor cable either in parallel or single connection?!!!!!!!!!!
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Could you cite the reference from NEC or elsewhere?
- Location
- Illinois
- Occupation
- retired electrician
Read all of 300.3(B). The general rule is that all of the circuit conductors, including the EGC must be in the same cable. 300.3(B)(3) acts as an exception where the cable has a non-magnetic jacket.
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