NEMA Releases Revised Panelboard and Distribution Switchboard Standards

06/19/2006


The Low Voltage Distribution Equipment Panelboard and Distribution Board Product Group of the National Electrical Manufacturers Assn. (NEMA), recently published two revised standards covering panelboards and distribution switchboards: PB 1-2006, Panelboards and PB 2-2006, Deadfront Distribution Switchboards. These are the first revisions of the two standards since 2000 and 2001, respectively.

PB 1-2006 is a general standard for panelboards providing information on panelboard types, voltage ratings, short-circuit current ratings, construction requirements and test procedures.

PB 2-2006 covers floor-mounted deadfront switchboards rated 6,000 amps or less, 600 volts or less and consist of an enclosure, molded case circuit breakers, low-voltage power circuit breakers, fusible or non-fusible switches, instruments, metering equipment, monitoring equipment or control equipment, with associated interconnections and supporting structures. These units are used in the distribution of electricity for light, heat, and power.

"PB 1 and PB 2 provide a common understanding within the electrical community for the purchase, testing, application and use of panelboards and switchboards,” says Kevin J. Lippert, chairman of the NEMA LVDE 02 Panelboard and Distribution Board Product Group. “This is very helpful for manufacturers, specifiers and users of these products. Changes to these documents include updates of references to the latest edition of other referenced codes and standards. In addition, the enclosure type designations were modified to reflect the most recent terminology in NEMA 250.”

PB 1-2006 may be viewed or purchased at www.nema.org/stds/pb1.cfm . PB 2-2006 may be viewed or purchased at www.nema.org/stds/pb2.cfm .





Product of the Year
Consulting-Specifying Engineer's Product of the Year (POY) contest is the premier award for new products in the HVAC, fire, electrical, and...
40 Under Forty: Get Recognized
Consulting-Specifying Engineer magazine is dedicated to encouraging and recognizing the most talented young individuals...
MEP Giants Program
The MEP Giants program lists the top mechanical, electrical, plumbing, and fire protection engineering firms in the United States.
May 2018
40 Under 40 winners, fire and life safety, performance-based designs, and more
April 2018
VRFs, lighting controls, BIM coordination, and more
March 2018
Sizing water pipes, ASHRAE 90.1, recovering waste heat, and more
Data Centers: Impacts of Climate and Cooling Technology
This course focuses on climate analysis, appropriateness of cooling system selection, and combining cooling systems.
Safety First: Arc Flash 101
This course will help identify and reveal electrical hazards and identify the solutions to implementing and maintaining a safe work environment.
Critical Power: Hospital Electrical Systems
This course explains how maintaining power and communication systems through emergency power-generation systems is critical.
click me