NEC Quiz: Article 220, Part Two

Code Quiz: Article 220, Part 2

Based on the 2005 NEC

Questions and answers written by Mark Lamendola, who has worked as a master electrician, electrical inspector, and design engineer. Mark is an IEEE Senior Member, and the Code article author for Codebookcity.com. He is a former editor of an electrical magazine were he edited Code articles.

1.      How many methods are there for calculating the loads for an existing structure?

2.      Under what conditions, if any, can the total load exceed the rating of the branch circuit?

3.      What Article applies to circuits that contain only motor-operated loads?

4.      What Article applies to circuits that contain only refrigeration loads?

5.      On what number do you base the load calculations for fluorescent lighting loads?

6.      If the loads on all of the branches for a particular feeder add up to 800A, can you use less than 800A as the calculated load for the feeder?

7.      What exactly do the demand factors for general lighting apply to?

8.      For dwelling units, what is the VA you must use for each 2-wire small appliance branch circuit?

9.      When applying demand factors to electric ranges, what is different when those ranges are located in dwelling units?

10.  What are the prohibited capacity reductions for the feeder or service neutral?