Article 338 of the National Electrical Code (NEC) covers the use, installation and construction specifications of service-entrance (SE) cable. Electricians commonly use these cables for service conductors and for feeders and branch circuits in residential and small commercial installations.
An electrician asked me a very interesting question concerning the sizing of a junction or pull box and the difference between the two. They are basically the same. Electricians use junction and pull boxes as access points for pulling and feeding conductors through raceway systems.
In the decades since the U.S. Consumer Product Safety Commission determined that electrical fires are disproportionately frequent in homes more than 40 years old, a generation of houses has aged into the danger zone.
The National Electrical Code (NEC) contains an introduction, nine chapters and eight annexes. Article 90 is the introduction to the NEC. This article contains specifications that are essential to all chapters and sections in the Code.
A seemingly simple change in the 2008 National Electrical Code (NEC)— prompting revisions or deletions of text for municipal, county or state NEC adoption processes relating to the installation of exposed nonmetallic-sheathed (NM) cable in a dwelling unit crawl space—has upset some people in the ele
A client requested that I inspect a generator installation that was determined to be the cause of a fire. The client’s concern was whether the installation identified as an optional standby system complied with the National Electrical Code (NEC).
Public officials in several states have embraced new safety standards, voting to adopt the 2008 National Electrical Code (NEC) with minimal or no amendments, and America’s heartland has taken the lead on acceptance.
How many equipment grounding conductors (paths) are required to be installed for a branch circuit supplying patient care areas when the governing body of the healthcare facility specifies isolated grounding (IG) receptacles for specific medical equipment?
The National Fire Alarm Code does not require anyone to install a fire alarm system. That statement sometimes surprises contractors who have been told by a fire official to install a fire alarm system in accordance with NFPA 72.
Recently, an inspector and contractor called me concerning a 277/480-volt feeder circuit that was designed to comply with the 2008 National Electrical Code (NEC) and supplied a building from the service equipment located in a substation switchboard room.