It does make more sense than two neutrals.It use to be common practice to put the grounded/neutral and the EGC under the same screw. I don't recall if it was allowed but was certainly done.
To be technically correct, the rule is only one conductor under the screw on the neutral bar, not just two neutrals. It use to be common practice to put the grounded/neutral and the EGC under the same screw. I don't recall if it was allowed but was certainly done.
To be technically correct, the rule is only one conductor under the screw on the neutral bar, not just two neutrals. It use to be common practice to put the grounded/neutral and the EGC under the same screw. I don't recall if it was allowed but was certainly done.
Did not read code, but pretty certain it is something to the effect that only one "grounded conductor" per terminal. Parallel conductors, where allowed, can land in a terminal that is designed for multiple conductors.
EGC's, if they can land there, can have how ever many the terminal is rated for.
IIRC many panels instructions only allowed one grounded conductor per terminal on typical neutral bus but did allow multiple grounding conductors. At some point (right or wrong - that is another topic) NEC decided this instruction wasn't being followed enough and decided to put it into code.
To be technically correct, the rule is only one conductor under the screw on the neutral bar, not just two neutrals. It use to be common practice to put the grounded/neutral and the EGC under the same screw. I don't recall if it was allowed but was certainly done.
kwired said:Did not read code, but pretty certain it is something to the effect that only one "grounded conductor" per terminal.
Each grounded conductor shall terminate within the panelboard in an individual terminal that is not also used for another conductor.
And that applies to the grounded (usually a neutral) conductor. If EGC's are permitted for any reason on the same bus, they do not have to be individual conductor per termination if the terminal accepts more than one conductor per its listing. I know Square D neutral bus bars are typically rated for 2 #14 or 2 #12. I think there are even some others out there that are listed to accept three 14 or 12 conductors - but still can only be one conductor per code if it is a "grounded circuit conductor"To be technically correct, it's both. Here is the code language:
(And then the exception for paralleled conductors.)Each grounded conductor shall terminate within the panelboard in an individual terminal that is not also used for another conductor.
Strictly speaking, it does not matter if the terminal is on a 'neutral bar', and it does not prohibit multiple EGCs from landing on another terminal on the same bar if allowed by the manufacturer.
That's pretty much right. The handbook clarifies that this is basically for troubleshooting safety.
If 2 neutrals are under the same screw, and someone needs to disconnect one neutral for troubleshooting, you don't want to make them also disconnect another neutral for a circuit that may still be hot. So that's why it only applies to grounded conductors, and why there is an exception for parallel conductors.