![]() ![]() (2) For a feeder rated 100 through 400 amperes, the feeder conductors supplying the entire load associated with a one-family dwelling, or the feeder conductors supplying the entire load associated with an individual dwelling unit in a two-family or multifamily dwelling, shall be permitted to have an ampacity not less than 83 percent of the feeder rating. (1) For a service rated 100 through 400 amperes, the service conductors supplying the entire load associated with a one-family dwelling, or the service conductors supplying the entire load associated with an individual dwelling unit in a two-family or multifamily dwelling, shall be permitted to have an ampacity not less than 83 percent of the service rating. For one-family dwellings and the individual dwelling units of two-family and multifamily dwellings, service and feeder conductors supplied by a single-phase, 120/240-volt system shall be permitted to be sized in accordance with 310.15(B)(7)(1) through (4).įor one-family dwellings and the individual dwelling units of two-family and multifamily dwellings, single-phase feeder conductors consisting of 2 ungrounded conductors and the neutral conductor from a 208Y/120 volt system shall be permitted to be sized in accordance with 310.15(B)(7)(1) through (3). Once there, click on their link to free access to the 2020 NEC ® edition of NFPA 70.ģ10.15(B)(7) Single-Phase Dwelling Services and Feeders. See the actual NEC ® text at NFPA.ORG for the complete code section. The new note under the table makes it clear that the table can only be used if adjustment or correction factors are not required.īelow is a preview of the NEC ®. In the 2020 NEC ®, the previous language in 310.15(B)(7) was restructured and relocated to new Section 310.12 and the old table has been brought back from Annex D. The table was brought back in 2017 but placed back in annex D for calculation D7. Take 83 amps and use the 75☌ column in Table 310.15(B)(16) to determine that the service requires 4 AWG copper, type THWN overhead service entrance conductors. ![]() This is the minimum required service conductor.
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