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Wednesday, March 3, 2010

The NEC and Commercial Loads

The NEC and Commercial Loads
How to apply demand factors
The electrical load requirements for commercial installations result in a great deal of diversity in usage. In other words, while some types of equipment and electrical loads are in use for extended periods, others are only used occasionally or for short periods of time. In addition, there are often two different types of electrical loads on the same service or feeder that will not be brought into service simultaneously by their very nature, such as heating and air conditioning. For this reason, we apply demand factors when calculating service and feeder loads. Different sets of demand factors apply for different types of electrical loads — and even for different types of commercial buildings.
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