In November, I covered the layout of National Fire Protection Association (NFPA) 70, the National Electrical Code. Here, I discuss the layout and use of NFPA 70E and its relationship to NFPA 70.
Emergency lighting systems consist of circuits and equipment intended to provide power to required facilities when normal power is interrupted. Municipal, state, federal or any governing agencies having jurisdiction typically are the entities that classify an emergency system.
Based on a new requirement in Section 210.8(B)(5) of the 2008 National Electrical Code (NEC), all 125-volt, single-phase, 15- and 20-ampere receptacles installed within 6 feet or 1.8 meters of the outside edge of a sink in a commercial or industrial facility must be covered by ground-fault circuit i
This article is the third in the series of proposed changes for the 2011 National Electrical Code (NEC). The May and July issues of ELECTRICAL CONTRACTOR covered some of the proposed changes through Article 300.
In the last issue of ELECTRICAL CONTRACTOR, I discussed the National Electrical Code (NEC) requirements for cord-and-plug-connected air conditioners (AC units). In this issue, I thought it would be appropriate to talk about the installation of permanently (hard-wired) installed units.
The National Electrical Code (NEC) contains many provisions where calculations are involved. Understanding the purpose of these calculations, as well as how to perform them, is essential to individuals who are in the electrical industry.
Establishing an equipotential zone at the work site—thereby protecting linemen working aloft and linemen, groundmen and equipment operators working on the ground during transmission and distribution (T&D) construction and maintenance operations—usually requires the use of a temporary grounding
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.
The purpose of ground-fault protection on temporary wiring installations during construction, remodeling, maintenance, repair or demolition of buildings, structures or equipment is to ensure personnel protection.
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.
A group of apprentices asked if there is an easy way to locate equipment and wiring method requirements in the Na-tional Electrical Code (NEC). If indeed there is a procedure, they wanted me to demonstrate such by designing and installing a motor system with examples.
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.
Contractors often field calls from prospective customers regarding the installation of a fire alarm system. The customer has made the decision to protect his building and wants advice on how best to accomplish this goal.