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The latest from NEMA on panelboards and switchboards
The National Electrical Manufacturers Association has released the following standards:
* ANSI/NEMA PB 1.1-2013, General Instructions for Proper Handling, Installation, Operation, and Maintenance of Panelboards Rated 600 Volts or Less. Maximum unit ratings are 1,600 ampere mains, l ,200 ampere branch circuits, with or without switches, fuses, or circuit breakers.
* ANSI/NEMA PB 2.1-2013, General Instructions for Proper Handling, Installation, Operation, and Maintenance of Deadfront Distribution Switchboards Rated 600 Volts or Less. Floor-mounted units rated up to 6,000 amperes include low-voltage power breakers, switches, instruments, and metering, monitoring, or control equipment.
Both documents may be downloaded free of charge, or hard copies purchased for $40 each, from NEMA by going to www.nema.org and searching for the documents by name.
Comment sought on UL substation standard
The American National Standards Institute is soliciting public comment on the new BSR/UL 1062-20lx. Standard for Safety for Unit Substations. The document covers ratings up to 1,000 kVA single-phase, 3,000 kVA three-phase with maximum primary or secondary voltage...