This article, second in a series, addresses design letters and code letters and how they are used in motor-circuit design and installation. It highlights the different characteristics of letters and why it is sometimes desirable to choose one over the other.
Electrical construction has always been a dangerous profession, so finding ways to make the work less hazardous is certainly the goal of the National Electrical Code (NEC); Underwriters Laboratories; the Occupational Safety and Health Administration; NFPA 70E, the Standard for Electrical Safety in t
As the government strives to implement healthcare reform and is approaching many hurdles, the 2011 National Electrical Code (NEC) is well into the development process. Technical committees have acted upon all NEC change proposals and comments.
Last month’s Code in Focus concluded by covering optional feeder and service load calculation requirements for one-family dwellings in 220.82. This month, the discussion continues with optional feeder or service load calculations for existing dwelling units as specified in 220.83.
Recently, i witnessed an electrical inspector and a group of electricians discussing the effectiveness of the bonding and grounding path where raceway fittings are used to connect raceways to threaded hubs, threaded bosses or conduit bodies.
If you have a problem related to the National Electrical Code (NEC), are experiencing difficulty in understanding a Code requirement, or are wondering if or why such a requirement exists, ask Charlie, and he will let the Code decide. Questions can be sent to email@example.com.
Hawaii has adopted NFPA 1 as the state fire code for the first time, effective Jan. 1, 2010. The decision to adopt the National Fire Protection Association (NFPA) fire code rested with the State Fire Council, which is composed of the fire chiefs from the four county fire departments.
There have been extensive changes to the 2010 edition of NFPA 72, the National Fire Alarm and Signaling Code. One of the more significant changes was the addition of the circuits and pathways chapter, Chapter 12. Twenty years ago, all we had to describe fire alarm circuits was Class A and B.
If you have a National Electrical Code (NEC)-related problem, are experiencing difficulty in understanding an NEC requirement, or are wondering why or if such a requirement exists, ask Charlie, and he will let the Code decide. Send your questions to firstname.lastname@example.org.
The first edition of the National Electrical Code (NEC) was developed in 1897. Including the 2008 edition, there are 51 editions. A lot has changed, both in the electrical industry and in the Code book, since the first edition.
Expanding electrical systems for existing residential, commercial and industrial facilities can be an expensive and difficult endeavor, unless the electrician, electrical contractor or design engineer can apply an optional calculation rule in Part IV of Article 220.
Lately, I’ve received a number of inquiries from contractors concerning the installation of lightning protection systems. Those electrical contractors’ main concerns are how to begin to design and install such a protective system and who or what entity requires or regulates its installation.
A recent addition to the 2008 National Electrical Code (NEC) has prompted a possible change for the 2011 NEC and a number of questions from electricians, electrical contractors, electrical inspectors and electrical engineers.
If you have a Code-related problem or are experiencing difficulty in understanding a National Electrical Code (NEC) requirement and are wondering why or if such a requirement exists, ask Charlie. And we will let the Code decide.