There’s a new 2011 Edition for NEMA PB 1, “Panelboards.” Just released in January 2012, the new standard is for single panelboards or groups of panel units suitable for assembly in the form of single panelboards.
It covers 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 for light, heat, and power at 600 volts and less with 1600 ampere mains and less or 1200 ampere branch circuits and less.
Excluded are live-front panelboards and panelboards employing cast enclosures for special service.
NEMA has also revised PB 2, “Deadfront Distribution Switchboards.” The new 2011 Edition covers floor-mounted deadfront switchboards rated 6,000 A or less, 600 V or less, that consist of an enclosure, molded-case circuit breakers, low voltage power circuit breakers, fusible or non-fusible switches, instruments, metering equipment, monitoring or control equipment, with associated interconnections and supporting structures.
ALL NEMA standards, including PB1-2011 and PB2-2011, can be purchased from Document Center Inc. in paper format. Use our website, www.document-center.com, or contact us by phone (650-591-7600), fax (650-591-7617) or email (info@document-center.com). We can assist you with all your standards requirements.