I know this section has been beat to death, but I have a very minor question on interpretation of "Main Power Feeder."

Many homes here are installed with services on one side of the home and the lighting and applaince panelboard on the other. (split-service/extended service)

On many occasions, the contractor installes a meter/main assembly. Many times, this main section also incorporates a panelboard section usually with 6 or so spaces. From this point, the feeder is connected to feed through lugs.

On many occasions, the outside panelboard is used to serve A/C loads, and perhaps pool equipment.

Can the feeder to the inside panelboard still be considered the "main power feeder"?

I am going to say it is a feeder, but not the "main" feeder.


What say Mike?

I change my answer. After rereading the section I think it would be OK, see "...For application of this section..."

Mike say Yes its a main power feeder

I also agree with Mike and Nick, as it explains it quite well in 310.15 (b)(6)

I agree it is OK if they size feeder to the general lighting sub panel at the size of the main breaker using 310.15(B)(6) since that is all that is required from there to the meter. When this gets questionable is when they have a larger main and split off a sub with another breaker and still want to use 310.15(B)(6) based on the size of the smaller breaker.

Yes you are correct...the problem is when they use this table to size the feeder to the detached garage panel or to the pool sub-panel.