Electical Contractor

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

A major change has occurred in Article 680 in the 2005 National Electrical Code (NEC) that will affect all swimming pools not constructed using conventional steel rebar and concrete (gunite).

Article 250-Grounding and Bonding Article 312-Cabinets, Cutout Boxes, and Meter Socket Enclosures Article 314- Outlet, Device, Pull, and Junction Boxes; Conduit Bodies; Fittings; and Handhold Enclosures Article 350-Liquidtight Flexible Metal Conduit: Type LFMC Article 404-Switches Article 410-Lumina

In the 2002 and previous editions of the National Electrical Code, the metal frame of a building or structure was required to be used as a grounding electrode when the metal of the building or structure was effectively grounded.

Ground-fault circuit interrupter (GFCI) protection for personnel or a similar protection technique has been in the National Electrical Code (NEC) since 1962 with specific reference to GFCI and its definition found in the 1968 NEC.

Article 100 Definitions Article 210 Branch Circuits Article 240 Overcurrent Protection Article 250 Grounding Article 310 Conductors for General Wiring Article 422 Appliances Article 680 Swimming Pools, Fountains, and Similar Installations Derating Parallel Conductors Q: I installed a 400-ampere, 4-w

Article 210 Branch Circuits Article 240 Overcurrent Protection Article 250 Grounding Article 310 Conductors for General Wiring Article 430 Motors, Motor Circuits and Controllers Branch-circuit size for motor load Q: I have to install a 11/2 horsepower, single-phase, 120V motor with a nameplate full

Consider a typical 120/240V single-phase service with a separate cast meter socket and a rigid steel conduit nipple connecting the meter socket to the service equipment enclosure.

The basis of grounding and bonding starts at the connection of a bonding jumper or an equipment-grounding conductor to a box, an enclosure or other electrical equipment and ends at the point of connection to the service-grounded conductor in a grounded system or at the service-equipment enclosure fo