Single Ø dwelling services and feeders can be found in which NEC section?

• A. NEC Section 220.82(C)
• B. NEC Table 430.248
• C. NEC Section 310.12
• D. NEC Section 220.52

Answer: (C)

Sizing single-family dwelling services and feeders hinges on knowing the ampacity of the conductors you’re allowed to use, based on insulation and temperature rating. That information, and how to apply it to select the correct wire size, is found in the section that covers conductor ampacity for feeders and services. It provides the ampacity tables you use after completing load calculations to ensure the chosen conductors can carry the required current safely. That makes this section the right place to find the rules for services and feeders.

Other topics shown in the other options deal with different parts of the NEC—one relates to motor circuit calculations, another to particular dwelling load factors, and another to general lighting loads. They don’t provide the essential conductor-ampacity guidance you use to size services and feeders, which is why they aren’t the correct location.