Electical Contractor

Inspectors, manufacturers, contractors and electricians have debated the installation orientation of panelboards and circuit breakers for many years. Should a panelboard be installed only in a vertical position, or can it be installed horizontally?

According to the most recent data from the United States Fire Administration, home electrical problems are responsible for an estimated 67,800 fires every year, resulting in 485 deaths, 2,300 injuries and more than $868 million in residential property loss. The U.S.

The truth about transient voltage surge suppressors A series of fatal fires recently have put transient voltage surge suppressors (TVSS) to the forefront of news again. It wasn’t necessarily the normal application of such devices that created hazards.

Article 90—Introduction; Article 312—Cabinets, Cutout Boxes and Meter Socket Enclosures; Article 314—Outlet, Device, Pull and Junction Boxes; Conduit Bodies; Fittings; and Handhole Enclosures; Article 330—Metal Clad Cable: Type MC; Article 695—Fire Pumps; Article 700—Emergency Systems

ARC-FAULT CIRCUIT INTERRUPTERS (AFCIs) first made their appearance in the National Electrical Code (NEC) in 1999, with a mandatory effective date of Jan. 1, 2002. Research—conducted by Underwriters Laboratories Inc. (UL) for the U.S.

Chances are you have encountered a wiring mass—or mess—somewhere along the road when installing voice/data/video or information transport systems. Year after year of adding, changing and rewiring may have left the plenum with little room for additional wiring and cabling.

Selective coordination has been a requirement in the National Electrical Code (NEC) for many years but has been limited to a few required applications.

Arc-fault circuit-interrupter(AFCI) protection requirements were first submitted to the National Electrical Code (NEC) process for the 1996 NEC but were not accepted until the 1999 NEC.