PB 1.1-2007
Page 21
Section 11
PERMISSIBLE LOADING OF PANELBOARDS
11.1 NATIONAL ELECTRICAL CODE
In compliance with the National Electrical Code, the normal continuous loads (3 hours or more) of
panelboard circuits should be not more than 80 percent of the rating of the overcurrent protective device,
unless the marking of the device indicates that it is suitable for continuous duty at 100 percent of its
rating.
11.2 HARMONICS IN ELECTRICAL SYSTEM
Some types of electrical equipment cause harmonics in the electrical system, which may result in
overheating. This condition should be considered when determining panelboard loading.
§
© Copyright 2007 by the National Electrical Manufacturers Association.
To Next Page
Loading...
