Jumper on Main Breaker.
- Thread starter stidwell
- Start date
- Status
- Location
- Illinois
- Occupation
- retired electrician
Other than the two wires under the one lug, I don't see a code issue.
That + proper identification of your grounded and grounding supply conductors.
(Is the wire to the breaker a #1 ?? )
Where would I find this in the code?
So it is perfectly legal to supply phase A and phase B with one Conductor? does this fall under the tap rules? I thought this has to be done with a jumper from the panel manufacturer or a breaker specific for this type of installation.
I don't mean to question your knowledge, but i'm trying to learn for my own benefit...
- Location
- New Jersey
- Occupation
- Journeyman Electrician
110.14(A) for two conductors on one lug.
You would, IMO, have to conform to the breaker manufacturer specs. The number and size of conductors allowed would be a part of the listing.
Using a split bolt or other means to provide two separate conductors is a matter of discussion.
(Violation of 240.21(C) tap rules, etc ??? )
Using a split bolt or other means to provide two separate conductors is a matter of discussion.
(Violation of 240.21(C) tap rules, etc ??? )
- Location
- Wisconsin
- Occupation
- PE (Retired) - Power Systems
FWIW, Square D's FAQ site says their QO/HOM 120/240V panels are not suitable for 120V only applications.
kwired
Electron manager
- Location
- NE Nebraska
I see 15 breakers with conductors on them but only 12 neutral conductors on the neutral bus. With two wire supply there needs to be a neutral for every pole - no MWBC's are permitted - technically they are not possible.
Don't know if there is a tap rule violation or not since we do not know what is supplying the primary of the transformer.
Don't know if there is a tap rule violation or not since we do not know what is supplying the primary of the transformer.
kwired
Electron manager
- Location
- NE Nebraska
You beat me to it. I counted again and did come up with 13 grounded. Handle ties don't matter, There is no way to connect a MWBC to a single voltage source.
hurk27
Senior Member
- Location
- Portage, Indiana NEC: 2008
11 branch circuit neutrals and 15 branch circuits? I think we have more problems with this installation then just a doubled up wire on the main, you cant have multi-wire circuits with only one phase conductor.
hurk27
Senior Member
- Location
- Portage, Indiana NEC: 2008
Wow do I type slow, 3 post get ahead of me
hurk27
Senior Member
- Location
- Portage, Indiana NEC: 2008
Ok I conceed there are from what I can see after blowing up the image is 12 white #12s and what looks like one black #12? along with two larger black conductor at the bottom of the neutral bar??
kwired
Electron manager
- Location
- NE Nebraska
Wow do I type slow, 3 post get ahead of me
You missed 2 neutrals also. they are just barely visible behind two different ungrounded conductors.
The ungrounded conductors are on the two breakers with tape on them.
kwired
Electron manager
- Location
- NE Nebraska
I bet a lot of thought had to go into whether or not the red tape on the jumper on the main was needed.
hurk27
Senior Member
- Location
- Portage, Indiana NEC: 2008
Your correct, 12 whites and 2 grays, still missing one grounded as that is 14.
Had to change my contrast setting to see the gray ones better. and also enlarged to about 250%
hurk27
Senior Member
- Location
- Portage, Indiana NEC: 2008
Ok after taking one more look I found the 15th grounded conductor, it is hid behind the second black circuit conductor on the left, if you look very close you will see it turn in line with it, so it runs right behind it to the neutral bar.
Myth busted
Myth busted
after re-reading my and other posts i realized the obvious that we cant have MWBC. :ashamed::slaphead:
- Status