Permitted reductions can be found in which part of the NEC?

Permitted reductions can be found in which part of the NEC?

• A. Section 220.45
• B. Section 220.61(B)
• C. Table 430.248
• D. Section 310.12

Answer: (B)

Permitted reductions are the adjustments you can apply to the calculated load when sizing feeders and services, reflecting that not all electrical loads operate at full capacity at the same time. The NEC specifies where these reductions may be used in Section 220.61(B), which lays out the reductions you are allowed to apply to the calculated feeder/service load under various conditions. This makes it the right reference because it directly states the permitted reductions for sizing calculations. The other sections touch on different aspects—dwelling-unit demand factors (for how loads are factored in dwellings), motor full-load current data, and conductor/voltage calculations—not the specific allowances for reductions in feeder and service sizing.

Permitted reductions are the adjustments you can apply to the calculated load when sizing feeders and services, reflecting that not all electrical loads operate at full capacity at the same time. The NEC specifies where these reductions may be used in Section 220.61(B), which lays out the reductions you are allowed to apply to the calculated feeder/service load under various conditions. This makes it the right reference because it directly states the permitted reductions for sizing calculations. The other sections touch on different aspects—dwelling-unit demand factors (for how loads are factored in dwellings), motor full-load current data, and conductor/voltage calculations—not the specific allowances for reductions in feeder and service sizing.