Knob-and-tube wiring was used in buildings as a source of electrical energy from the 1880s. From the late 1930s–1950s, nonmetallic sheathed cable (type NM cable) and armored cable (type AC cable) were installed without an...
In the years working with design engineers for PQ instrumentation, occasionally all of the engineers would gather around a project that had a significant failure and resulted in a smoke cloud wafting up to the lab ceiling. We...
Jim Dollard has an extensive background in codes and standards. If you have a query about the National Electrical Code (NEC), Jim will help you solve it. Send questions to codefaqs@gmail.com. Answers are based on the 2017 NEC...
Jim Dollard has an extensive background in codes and standards. If you have a query about the National Electrical Code (NEC), Jim will help you solve it. Send questions to codefaqs@gmail.com. Answers are based on the 2017 NEC...
Jim Dollard has an extensive background in codes and standards. If you have a query about the National Electrical Code (NEC), Jim will help you solve it. Send questions to codefaqs@gmail.com. Answers are based on the 2017 NEC...
Residential load centers and circuit breakers haven’t changed much over the years, and the UL standard for GFCI circuit breakers has been updated to improve safety. On Aug. 1, Leviton and Electrical Contractor magazine teamed...
On Mar. 7, 2018, at 2 p.m. EST, ELECTRICAL CONTRACTOR and Legrand partnered to present a free webinar, "Meeting Code With GFCI Receptacles." The video is now available for free below. There are several solutions available to...
A question was raised at a recent meeting that I attended. It started a search through both current and older versions of the National Electrical Code (NEC). The initial question involved a single-speed, 240-volt (V), single...
