PB 1.1-2007
Page 1
Section 1
SCOPE
This publication covers single panelboards or groups of panel units suitable for assembly in the form of
single panelboards, including buses, and with or without switches or automatic overload protective
devices (fuses or circuit breakers), or both. These units are used in the distribution of electricity at 600
volts and less with:
1600—ampere mains or less
1200—ampere branch circuits or less
Specifically excluded are live-front panelboards, panelboards employing cast enclosures for special
service conditions, and panelboards designed primarily for residential and light commercial service
equipment.
© Copyright 2007 by the National Electrical Manufacturers Association.
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