The load is to be evenly proportioned among multi-outlet branch circuits within the panelboard (main service panel or loadcenter).The minimum number of branch circuits in a residence is to be determined from the total computed load and the size or rating of the circuits used.Permanent ground-fault circuit-interrupter (GFCI) protection is to be installed on all 125-V, single-phase, 15- and 20-A receptacles in bathrooms, garages, crawl spaces, and unfinished basements, and at utility sinks and outdoor locations.The ratings for branch circuits are 15, 20, 30, 40, and 50 A. NEC 2011, Article 210, “Branch Circuits,” in Chapter 2, “Wiring and Protection,” covers branch circuits except for those that supply only motor loads.
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