Sizing Conductors, Part (ⅩⅩⅩⅣ)

摘要

Article 240, in the national electrical code (NEC), provides general requirements for overcurrent protection and overcurrent protective devices. Also covered in Article 240 are overcurrent protection requirements for supervised industrial installations operating at voltages of not more than 1,000 volts (V), nominal. Section 240.4(E) contains a list of sections where requirements for tap conductors are located. The most referenced section in 240.4(E) is probably 240.21. In accordance with 240.2, overcurrent protection shall be provided in each ungrounded circuit conductor and shall be located at the point where the conductors receive their supply except as specified in 240.21(A) through (H). While branch circuits, services, busways, motors, generators and batteries. While this section mentions branch circuits, most of the rules are for feeder taps and transformer secondary conductors.