NM Cables With Reduced EGC. - 11/28/09 09:54 PM
So as not to completely hijack an existing thread, I’m posting this as a new topic for discussion.
It’s not clear, at least to me, that for an existing installation 250.140, 250.140, Exception and the related articles actually reference or lead to Table 250.122 for equipment-grounding conductor sizing as for all new branch circuit installations.
What are your opinions on this?
Original thread from "Dryer Wiring Question" in the General Discussion Forum:
How would you handle an old style 10/3 NM with reduced equipment-grounding conductor when upgrading from three-wire to four-wire dryer receptacle?
Would you run a new 10/3 NM branch circuit with a full size equipment-grounding conductor or use the existing 10/3 NM, keeping in mind that the new 4-wire receptacle has terminals rated for #10 to #4 AWG wire.
I know I’ve connected the old 14/2 and 12/2 NM with reduced grounding conductors to the grounding terminals of 15A 3-wire duplex receptacles during replacement before, without really thinking about how the minimum size wire rating on the device terminals is #14 AWG.
I guess in actuality, a pigtail could be used to comply here.
It’s not clear, at least to me, that for an existing installation 250.140, 250.140, Exception and the related articles actually reference or lead to Table 250.122 for equipment-grounding conductor sizing as for all new branch circuit installations.
What are your opinions on this?
Original thread from "Dryer Wiring Question" in the General Discussion Forum:
How would you handle an old style 10/3 NM with reduced equipment-grounding conductor when upgrading from three-wire to four-wire dryer receptacle?
Would you run a new 10/3 NM branch circuit with a full size equipment-grounding conductor or use the existing 10/3 NM, keeping in mind that the new 4-wire receptacle has terminals rated for #10 to #4 AWG wire.
I know I’ve connected the old 14/2 and 12/2 NM with reduced grounding conductors to the grounding terminals of 15A 3-wire duplex receptacles during replacement before, without really thinking about how the minimum size wire rating on the device terminals is #14 AWG.
I guess in actuality, a pigtail could be used to comply here.