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.
The first edition of the National Electrical Code (NEC) was published in 1897 by the National Board of Fire Underwriters, which is now the American Insurance Association. Safety was the reason a group of 23 people met to develop a national set of rules for electrical construction and operation.
What is the relationship between NFPA 70 (the National Electrical Code), NFPA 70B (Maintenance for Electrical Equipment), and NFPA 70E (Safety Related Work Practices)? An Electrical Contractor reader asked if I would explain how NFPA 70, 70B and 70E were related in codes and standards application.
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.
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.
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.
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.
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