NolaTigaBait
Senior Member
- Location
- New Orleans,LA
did the 2008 code no longer allow you to use this table for feeders that aren't the main source of power for a dwelling...Was this table allowed to be used before 2008 or was this always the case?
ChSection 310.15(B)(6) permits the main feeder to a dwelling unit to be sized according to the conductor sizes in Table 310.15(B)(6). ALSO LOOK AT 338.10.B4a6; For the 2008 Code, the panel clarified that this permission to use this table applies only to conductors carrying 100 percent of the dwelling unit's diversified load.did the 2008 code no longer allow you to use this table for feeders that aren't the main source of power for a dwelling...Was this table allowed to be used before 2008 or was this always the case?
ChSection 310.15(B)(6) permits the main feeder to a dwelling unit to be sized according to the conductor sizes in Table 310.15(B)(6). ALSO LOOK AT 338.10.B4a6; For the 2008 Code, the panel clarified that this permission to use this table applies only to conductors carrying 100 percent of the dwelling unit's diversified load.
Provided a single set of 3-wire, single-phase, service-entrance conductors in raceway or cable supplies a one-family, two-family, or multifamily dwelling, the reduced conductor size permitted by 310.15(B)(6) is applicable to the service-entrance conductors, service-lateral conductors, or feeder conductors that supply the main power feeder to a dwelling unit. The feeder conductors to a dwelling unit are not required to be larger than its service-entrance conductors.
Exhibits 310.8 and 310.9 illustrate the application of 310.15(B)(6). In Exhibit 310.8, the reduced conductor size permitted is applicable only to the service-entrance conductors run to each apartment from the meters. In Exhibit 310.9, the reduced conductor size permitted is also applicable to the feeder conductors run to each apartment from the service disconnecting means,eck out the Handbook, I think, No would be applicable here until you get to #6 conductors.
NO. Is that simpler?:smile:did the 2008 code no longer allow you to use this table for feeders that aren't the main source of power for a dwelling...Was this table allowed to be used before 2008 or was this always the case?
OK!!!!!!!!!!!!!!!!!!!!!!!!!!!!
ouch.... Seemed unnecessary.
Can you fuse it down to the proper size. If the load allows just change the breaker.
on one panel, i don't think it'll be a prob, but the other has 40 circuits....so, im not really sure what the demand is
if you are not sure what the demand is, then how can you know what you need? Isn't it the electricain's job to figure for the load(s) being served? Or maybe you should ask an engineer. Those guys are really smart!
I submitted a proposal to revert to the 2005 language, as I think this is the worst change in the 2008.
im kinda confused here....are you saying in 05 that #4 was good for 100 amps even if it wasnt supplying 100 of the load?....several others have said that this ISN'T new for '08, it was just clarified
As currently written, I could have a 200A service with 4/0 AL as long as everything comes off of that panel. So lets say I have 2 air conditioners in that subpanel. If I were to decide I wanted I wanted to put them out at me service disconnect, I would be putting less load on the feeder circuit, but now I have to make the wires bigger? Thats the stupidest thing I have ever heard in my life. Less load equals bigger wires???
that's exactly what i was thinking!....