The International Electrotechnical Commission (IEC) documents use a totally different nomenclature to describe the electrical potential between phase conductors and earth than the National Electrical Code (NEC).
Adequacy of reducing washers questioned When removing concentric or eccentric knockouts from a sheet-metal enclosure, it sometimes happens that a larger size than desired comes out or the only available knockout is larger than needed.
Understand related systems and learn important cues Why do many contractors continue to avoid scheduling the fire alarm system installation inspection? Is it because they know the system might fail the acceptance test and, as such, would thereby delay occupancy?
Interpreting swimming pool code requirements The May 2005 Code Applications column, “Going For a Swim,” contained information on a major change in Article 680 for the 2005 National Electrical Code (NEC) concerning the construction requirements of fiberglass pools, vinyl-lined pools and concrete pool
Seismic requirements for electrical installations Concern about earthquakes and their impact on buildings and facility operation is no longer limited to those regions of the United States, such as the West Coast, where seismic activity is common.
ARC-FAULT CIRCUIT INTERRUPTERS (AFCIs) first made their appearance in the National Electrical Code (NEC) in 1999, with a mandatory effective date of Jan. 1, 2002. Research—conducted by Underwriters Laboratories Inc. (UL) for the U.S.
220.14 Other Loads—All Occupancies Load calculation requirements are in Article 220 of the National Electrical Code (NEC). This article provides requirements for calculating branch-circuit, feeder and service loads. Article 220 is divided into five parts.
It’s hard to believe that electrical contractors still carry the “installer of product” stigma—especially when an ELECTRICAL CONTRACTOR report indicates that design/build projects account for 46 percent of contractor revenue.
Imagine an electrical contractor meeting a homebuyer at the builder’s sales office. The contractor walks through the plans for the new house and asks the homeowner for a description of his lifestyle, the way he wants to use his home, what he expects it to be able to do.
Protection for Type MC cable Q:Why does the National Electrical Code (NEC) require physical protection for Type MC cable where installed less than 1.25 inches from the surface for runs that are parallel to metal framing members, but this clearance is not required where the cable is pulled through pr
The use of design/build as a project delivery system continues to grow in the United States. However, the adoption of design/build in the public sector has lagged the private sector since its rediscovery in the 1990s.