PB 1.1-2007
Page iv
© Copyright 2007 by the National Electrical Manufacturers Association.
Foreword
This publication is a guide of practical information containing instructions for the proper installation,
operation, and maintenance of panelboards rated 600 volts or less.
These instructions do not purport to cover all details or variations in equipment, nor to provide for every
possible contingency regarding installation, operation, or maintenance.
It is recommended that work described in this set of instructions be performed only by qualified personnel
familiar with the construction and operation of panelboards and that such work be performed only after
reading this complete set of instructions. For specific information not covered by these instructions, you
are urged to contact the manufacturer of the panelboard directly.
In the preparation of this Standards Publication input of users and other interested parties has been
sought and evaluated. Inquiries, comments, and proposed or recommended revisions should be
submitted to the concerned NEMA product section by contacting the following: These recommendations
will be reviewed periodically and updated as necessary.
Vice President, Technical Services
National Electrical Manufacturers Association
1300 North 17th Street, Suite 1752
Rosslyn, Virginia 22209
Publication No. PB 1.1- 2007 revises and supersedes PB 1.1-2002.
This Standards Publication was developed by the Panelboard and Distribution Board Product Group of the
LVDE Section. Product Group approval of the standard does not necessarily imply that all Product Group
members voted for its approval or participated in its development. At the time it was approved, the Product
Group was composed of the following members:
Eaton Electrical Inc.—Pittsburgh, PA
GE—Plainville, CT
Hubbell, Inc.—Orange, CT
Milbank Manufacturing Company—Kansas City, MO
Penn Panel & Box Company—Collingdale, PA
Reliance Controls Corporation—Racine, WI
Siemens Industry, Inc.—Norcross, GA
Square D Company—Palatine, IL
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