Temporary Wiring -- Art. 305 Choose the best answer: 1. If you must provide a 60A, 120/240V temporary feeder for work on the 15th floor of a high-rise building under construction...
Topics discussed in our "Code Forum" column involve complicated issues requiring extensive analysis. However, not every Code question warrants such in-depth treatment. Here are...
General wiring rules -- Art. 300 Choose the best answer: 1. Which of the following methods provides acceptable mechanical protection against abrasion of Type NM cable when you...
Yes, it’s true. Sec. 240-3(d) (the former Table 310-16 obelisk note) doesn’t apply to pure motor circuit conductors sized in accordance with Sec. 430-22(a). The drawing you see...
Topics discussed in our “Code Forum” column involve complicated issues requiring extensive analysis. However, not every Code question warrants such in-depth treatment. Here are...
Topics discussed in our “Code Forum” column involve complicated issues requiring extensive analysis. However, not every Code question warrants such in-depth treatment. Here are...
Sizing wye-delta conductors to a hermetic refrigerant compressor don't follow the same rules as regular motor conductors in similar use — an error in the NEC. We received an interesting...
Choose the best answer: 1. Suppose you install a 13.8kV, 480Y/277V transformer and secondary panel with a main disconnect on the top floor of a 5-story office building. Assume...