Electrical design for HVAC systems

摘要

For many engineers, contractors, and | facility personnel, Article 430 of the National Electrical Code (NEC), Motors, Motor Circuits, and Controllers, is a real mystery. The rules governing the sizing of conductors and overcurrent protective devices (OPD) for pump and fan motors simply do not seem to agree with other articles of the NEC. Due to the wide range of available motor types and applications, this article will address single-speed, nonreversing, single- and three-phase induction motors in fractional and integral horsepower sizes.