Electical Contractor

Article 110 Requirements for Electrical Installations; Article 230 Services; Article 300 Wiring Methods; Article 310 Conductors for General Wiring; Article 314 Outlet, Device, Pull, and Junction Boxes; Conduit Bodies; Fittings; and Handhole Enclosures; Article 330 Metal-Clad Cable: Type MC; Article

Provisions in article 220 are few in number compared to the total number of provisions in the National Electrical Code (NEC) book. The number of pages containing requirements in Article 220 makes up approximately 1½ percent of the total number of pages in the NEC that contain requirements.

In section 250.52(A)(2) of the 2005 and the 2008 editions of the National Electrical Code (NEC), the metal frame of a building or structure is considered to be a grounding electrode if the metal frame is connected to earth by one of four different methods.

As stated in the introduction, the purpose of the National Electrical Code (NEC) is the practical safeguarding of people and property from hazards arising from the use of electricity [90.1(A)].

Article 110 Requirements for Electrical Installations; Article 210 Branch Circuits; Article 230 Services; Article 250 Grounding and Bonding; Article 310 Conductors for General Wiring; Article 338 Service Entrance Cable: Types SE and USE; Article 680 Swimming Pools, Fountains, and Similar Installatio

This article provides readers with another high-level review of significant revisions that have been accepted at this stage in the 2011 National Electrical Code (NEC) development process.

I conduct a number of National Electrical Code (NEC)-related seminars each month. Lately, people have been asking about the requirements for grounding and bonding systems together to provide an equipotential plane.

When inspecting a small office facility for a customer, I was surprised that he had a fuel cell system for his main power source that was backed up by an optional standby generator system. In other words, the complex did not depend on utility power.