Recently I wired 8 gas fired hot air furnaces on 4 multiwire branch circuits.Later I saw that 422.12 required central heating equip. to be on individual branch circuits.Each multiwire branch circuit consists of 2 20 amp breakers with handle tie . 12-3 mc to j-box then 12-2 mc to ssy with 15 amp fuse to each furnace.Why would this present a problem ?
422.12 violation?
- Thread starter tommyrice
- Start date
- Status
jumper
Senior Member
- Location
- 3 Hr 2 Min from Winged Horses
I think you may be okay
210.4 Multiwire Branch Circuits.
(A) General. Branch circuits recognized by this article
shall be permitted as multiwire circuits. A multiwire circuit
shall be permitted to be considered as multiple circuits.
- Location
- Chapel Hill, NC
- Occupation
- Retired Electrical Contractor
4 MWBC is the same as 8 individual circuits, assuming 2 hots & 1 neutral. 422.12 is not calling for individual neutrals. Your install is fine.
- Location
- New Jersey
- Occupation
- Journeyman Electrician
Sounds fine, except the handle tie kind of stinks. If you need to shut off just one circuit you'll end up knocking out two boilers.
jxofaltrds
Inspector Mike®
- Location
- Mike P. Columbus Ohio
- Occupation
- ESI, PI, RBO
Not if he complied with 422.32.
- Status