NCCER Load Calculations – Feeders And Services (26401-23) Practice Test

The rule about a 25-foot tap length comes from the taps section of the NEC, specifically the provision that defines the allowable length for a tap conductor from the last overcurrent protective device to the point of utilization. This 25-foot limit is what lets a short, direct connection be treated under tap rules rather than as a full feeder, simplifying sizing and protection as long as other requirements are met. That exact 25-foot tap rule is found in NEC 240.21(B)(2). If the run is longer than 25 feet, different tap conditions apply (covered under other parts of 240.21(B)), not the 25-foot rule. The other options address unrelated topics: 230.6 concerns service disconnect requirements, and Table 430.250 deals with motor overload protection, not the tap-length rule. So the correct place to find the 25-foot tap rule is NEC 240.21(B)(2).