stickboy1375
Senior Member
- Location
- Litchfield, CT
Smart $ said:
Same thing that happens to the guy the pulls a MWBC to a panel with no grounded conductor...
:grin:
240 volt loadcenter wired 120
- Thread starter augie47
- Start date
- Status
Same thing that happens to the guy the pulls a MWBC to a panel with no grounded conductor...
:grin:hardworkingstiff
Senior Member
- Location
- Wilmington, NC
Ed Carr said:
It is a breaker that has a neutral wire coming out of it that is connected to the neutral bar and then you connect your circuit neutral to the breaker beside the ungrounded conductor. I use them to satisfy 514.11. You are correct, it is not a GFI.
A single pole takes up 2 spaces in the panel and a 2-pole takes up 3 spaces. The single-pole usually cost about 2-3 times as much as a standard 2-pole breaker.
The funny part, if true, is that I've heard in Canada, it is a code violation to do this.
Ed Carr
Senior Member
- Location
- way upstate NY
Thanks Lou-
UL Panelboard Marking Guide '07
page 5
Voltage Rating
6. The basic voltage markings must be visible without disturbing wiring and other interior parts. . A panelboard designed and intended for use only on a supply circuit involving two different potentials (for example, 120/240 volts, three-wire; or 208Y/120 volts, three-phase, four-wire) is so marked.
It would be my guess that the reason for the restriction and the use of the word "only" is because of concern with the MWBC situation. . There are electricians everywhere that would land the hots on side by side breakers and not give it another thought. . Doubled neutral currents is a huge concern.
You'll have to check the panel label to know for sure but I hope UL has handled this one properly and is preventing legal installations of a single hot to multiple bus bars. . I'm sure it will still continue to be done even if not legal. . But I hope their panel marking is keeping it out of legal installations.
David
page 5
Voltage Rating
6. The basic voltage markings must be visible without disturbing wiring and other interior parts. . A panelboard designed and intended for use only on a supply circuit involving two different potentials (for example, 120/240 volts, three-wire; or 208Y/120 volts, three-phase, four-wire) is so marked.
It would be my guess that the reason for the restriction and the use of the word "only" is because of concern with the MWBC situation. . There are electricians everywhere that would land the hots on side by side breakers and not give it another thought. . Doubled neutral currents is a huge concern.
You'll have to check the panel label to know for sure but I hope UL has handled this one properly and is preventing legal installations of a single hot to multiple bus bars. . I'm sure it will still continue to be done even if not legal. . But I hope their panel marking is keeping it out of legal installations.
David
- Location
- Windsor, CO NEC: 2023
- Occupation
- Hospital Master Electrician
Stupid question: If it were illegal to use a panelboard as such, how would we make use of 690.10(C)?
- Location
- Chapel Hill, NC
- Occupation
- Retired Electrical Contractor
georgestolz said:
Very nice find George, but wouldn't that imply it would not be legal in situations other than specified in art. 690.10(C).
- Location
- Windsor, CO NEC: 2023
- Occupation
- Hospital Master Electrician
No, it's an express permission to do so in that circumstance. It is not a prohibition from doing it in other circumstances. (90.5(B))Dennis Alwon said:Very nice find George, but wouldn't that imply it would not be legal in situations other than specified in art. 690.10(C).
- Status