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NEC ARTICLE 250: Grounding & Bonding
Download the carefully crafted NEC Article 250: Ground and Bonding definitions and tables chart. Download includes Grounding Electrode Conductor for Alternating Current systems, Grounded Conductor, Main Bonding Jumper, System Bonding Jumper, and Supply-Side Bonding Jumper.
ADJUSTABLE SPEED DRIVES AND MOTOR PROTECTION
Abstract – One of the application considerations that must be evaluated when utilizing an adjustable speed drive (ASD) is motor protection. This is not as simple as it may seem. There are many potential motor protection relay (MPR) options in the market; however, these MPRs have typically been designed to provide protection to motors operating on standard sine wave utility power at nominal frequencies assuming some form of direct or reduced online starting. As a result, there are a number of considerations that engineers must take when applying these relays to ASD applications, since the variation in frequency can render certain relayfeatures ineffective.
DESIGNING AND SPECIFYING MCCS TO REDUCE HAZARDS AND RISKS, USING IEEE 1683
Abstract – IEEE 1683 “IEEE Guide for Motor Control Centers Rated up to and including 600 V AC or 1000 V DC with Recommendations Intended to Help Reduce Electrical Hazards” was released in 2014. The goal of IEEE 1683 is to provide guidance on power system design, motor control center configurations, and feature selections that can help reduce the hazards and risks associated with working in, on, and around low-voltage motor control centers. This paper will discuss some of the recommendations provided in IEEE 1683. It will then explore a user experience with IEEE 1683 and will provide examples of the considerations involved in making design and feature selection decisions.