Electrical Exam Term
Demand Factor
The ratio of the maximum demand on an electrical system to the total connected load, expressed as a percentage.
Detailed Explanation
Demand factors are used in load calculations because not all connected loads operate simultaneously. NEC Article 220 provides standard demand factors for different types of loads. For example, the first 10 kVA of general lighting and receptacle load is calculated at 100%, while the remainder is calculated at 35%. Applying demand factors results in more realistic and economical system sizing.
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Practice QuestionEasy
Which of the following best describes the concept of Demand Factor?
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