Which topic is assigned to NEC Section 240.21(C)?

Which topic is assigned to NEC Section 240.21(C)?

• A. Feeder taps
• B. Taps supplying a transformer (primary plus secondary, not over 25')
• C. Outside taps of unlimited length
• D. Transformer secondary conductors

Answer: (D)

The key idea here is recognizing how NEC 240.21 is organized by the type of conductor or tap. The subsection labeled 240.21(C) specifically addresses transformer secondary conductors. This means the topic covered by that section deals with the conductors on the transformer’s secondary side—those that carry current from the transformer to the downstream loads or panels and the rules that apply to them for protection and sizing. That’s why the correct choice is transformer secondary conductors: it matches the exact topic assigned to this code subsection. The other options describe different kinds of taps or conductors that fall under different parts of 240.21 (feeder taps, taps supplying a transformer, or outside taps).

The key idea here is recognizing how NEC 240.21 is organized by the type of conductor or tap. The subsection labeled 240.21(C) specifically addresses transformer secondary conductors. This means the topic covered by that section deals with the conductors on the transformer’s secondary side—those that carry current from the transformer to the downstream loads or panels and the rules that apply to them for protection and sizing.

That’s why the correct choice is transformer secondary conductors: it matches the exact topic assigned to this code subsection. The other options describe different kinds of taps or conductors that fall under different parts of 240.21 (feeder taps, taps supplying a transformer, or outside taps).