Electical Contractor

I had the privilege of being the guest speaker at a recent contractors meeting, and to my surprise, I was asked an unusual question by a well-known local contractor during the question-and-answer period.

Emergency circuits are installed in patient bed locations in general care and critical care areas in hospitals to ensure power is available to electrical equipment even where normal power is lost for some reason.

Many installations have exposed raceways and electrical equipment of all kinds on rooftops, walls and other direct sunlight applications, since this has been a common installation method for many years.

For many years, the audibility and intelligibility of fire alarm signals were ignored. Traditionally, a contractor or designer would put one audible/visible appliance above each manual fire alarm box (pull station) and maybe one or two more in the hallway.

Article 210 Branch Circuits; Article 220 Branch Circuit, Feeder, and Service Calculations; Article 240 Overcurrent Protection; Article 250 Grounding and Bonding; Article 330 Metal-Clad Cable: Type MC; Article 422 Appliances; Article 450 Transformer and Transformer Vaults (Including Secondary Ties)

Certain changes to the National electrical Code (NEC) take more than a single cycle to accomplish due to the complexity of the issues, changes that may involve more than one NFPA committee, changes that involve more than one NEC panel, changes where another NFPA committee and an NEC panel are involv

Article 338 of the National Electrical Code (NEC) covers the use, installation and construction specifications of service-entrance (SE) cable. Electricians commonly use these cables for service conductors and for feeders and branch circuits in residential and small commercial installations.

In the decades since the U.S. Consumer Product Safety Commission determined that electrical fires are disproportionately frequent in homes more than 40 years old, a generation of houses has aged into the danger zone.