ROSSLYN, Va.—The National Electrical Manufacturers Association (NEMA) published NEMA GD 4-2020 COVID-19 Cleaning and Disinfecting Guidance for Electrical Equipment. Managing the SARS-CoV-2 (COVID-19) virus requires proper cleaning and disinfecting of equipment, so Members...
Wiring methods for Class I, Division 2 locations are addressed in Section 501.10(B) of the NEC. Here, in addition to those wiring methods that are permitted for Class I, Division 1 installations in Section 501.10(A), the NEC covers other wiring methods that are permitted for Class I, Division 2.
The benefit of group motor installations is that only one branch-circuit overcurrent protective device (fuse or listed inverse-time circuit breaker) is required to provide short-circuit protection for all motor controllers or overload protection devices in the group.
Zone-selective interlocking (ZSI) has been in practical use since the mid-1980s. This technology was created to speed up the tripping time for some faults within a zone of protection without sacrificing selective coordination and interjecting nuisance tripping into the system.
A supply-side interconnection is any connection to the service conductors on the supply-side of the service disconnecting means. The 2017 National Electrical Code (NEC) contains nine categories of equipment. A list of allowed supply-side interconnections is provided in NEC 230.82.
This article relates to National Electrical Code (NEC) 250.70, which states: “Methods of Grounding and Bonding Conductor Connection to Electrodes. The grounding or bonding conductor shall be connected to the…
The challenge is getting people out of flammable clothing and into appropriate PPE through code guidance that’s easier to understand and implement. It starts by putting ourselves in a contractor’s shoes.