TWO EGC UNDER ONE SCREW

[wwhitney]

By definition you have created MWBC so yes.

That's not at all clear to me. The definition of branch circuit makes it clear where the boundary is on the ungrounded conductor(s), but is silent on the boundary for the grounded conductor. If you see the boundary as the neutral bar, then it would be an MWBC. But perhaps the boundary is the panelboard enclosure, in which case there is no MWBC.

As a practical matter, if the three grounded conductors were joined to a jumper to the neutral bar with a 4-port polaris style connector rather than with a wire nut, I see no reason to consider it an MWBC. Certainly if an additional terminal bar mounted to and insulated from the enclosure were installed for the 3 grounded conductors, with a jumper to the neutral bar, it would not be an MWBC.

Cheers, Wayne

 

[tom baker]

Two egc under one screw or lug ? what code article. ( 2011 code )

110.3(B)
This answer is intended for the ground bars with multiple set screws as you typically see in a panel

 

[Adamjamma]

This has nothing to do with switching. It's a case where three simple single-phase circuits are added to an existing three-phase panel, but there are not three neutral terminals available, so I joined the three neutrals to a single pigtail to land in one neutral terminal in the panel. Several neutrals are already doubled up.

Normally, a MWBC requires joined breaker handles, so opening a shared neutral won't create an unexpected energized-conductor situation. With the neutrals joined within the panel, it's unlikely that they would ever be separated, and if they were, it would be obvious what was done and which breakers are involved.

Ok... so not enough neutrals in breaker panel... which happens in older breaker panels... so.. you could do as you say, or you could use some Wagos to combine the neutrals and the grounds in separate wagos... and unless it is a major fault should be ok...
but would rather add more ground lugs and move grounds... personally.
however, agree that youmnay be right and since it is neutral it does not make an mwbc

 

[jaggedben]

110.3(B)
This answer is intended for the ground bars with multiple set screws as you typically see in a panel

:thumbsup:

 

[kwired]

110.3(B)
This answer is intended for the ground bars with multiple set screws as you typically see in a panel

+1. Some might even be allowed three conductors in one lug. Multiple conductors is usually limited to 14 and 12 AWG and all of the conductors used in one lug must be same size. See instructions per the manufacturer involved.