Ground-fault sensing and relaying equipment is intended for use in power distribution systems rated at 600V maximum and are considered to be equipment protection devices, not personal protection devices.
In many conversations with electrical inspectors on the subject of arc-fault circuit-interrupters (AFCIs), I find them variously questioning, doubtful, confused, bewildered and puzzled concerning the application of 210.12.
Cooking Equipment Calculations, Part III 220.19 Electric Ranges and Other Cooking Appliances Article 220 of the National Electrical Code contains specifications for calculating branch-circuit, feeder and service loads.
Many changes have occurred to the National Electrical Code (NEC) since the first NEC was published on Aug. 31, 1897. Even though the electrical industry was in its infancy, this “first” NEC was remarkably insightful and has withstood the test of time.
Specifications for calculating branch-circuit, feeder and service loads are in Article 220 of the National Electrical Code. This article is divided into four parts: I. General, II. Feeders and Services, III. Optional Calculations for Computing Feeder and Service Loads and IV.
Article 220 contains provisions for calculating branch-circuit, feeder and service loads. Following the requirements set forth in this article will provide the minimum size branch circuit, feeder or service.
There’s a problem that is either right in front of us or lurking around the corner. The problem involves data communications cabling above drop ceilings in commercial buildings—some of that old cable has been accumulating in ceiling spaces for years and years.
At one time or other, all contractors have been faced with a decision to either recalculate the size of an existing service or feeder or just guess at the amount of spare load and install new circuits while hoping for the best. Guessing will usually only get you in trouble.
Owners often contact contractors to install fire alarm systems in existing buildings. And, just as often, the Code does not require these installations. Rather, the building owner simply wants a fire alarm system installed for his or her own peace of mind.
Article 210 specifies provisions for all branch circuits except for branch circuits supplying only motor loads. Article 430 contains motor load requirements. Branch circuits with combination loads (motor and non-motor) must be installed in accordance with Articles 210 and 430.
This is the conclusion of a two-part article that began in the November issue. This part provides important information for listing and National Electrical Code requirements for installations of emergency, legally required standby and optional standby systems.
CODE CITATIONS Article 210 Branch Circuits Article 250 Grounding Article 408 Switchboards and Panelboards Article 430 Motors, Motor Circuits and Controllers Article 680 Swimming Pools, Fountains and Similar Installations Volume One of the 2003 edition of the Fire Resistance Directory published by Un
This is the first of two parts about installing emergency, legally required and/or optional standby systems. This first part will cover the basics of the three systems and the second part will cover requirements for transfer equipment.
210.70(A)(2) Lighting Outlets Required Lighting outlet and wall switch provisions for dwelling units, guest rooms (hotel, motel and similar occupancies) and certain areas in non-dwelling occupancies are covered in 210.70(A) through (C).
Many of today’s electrical contractors are constantly trying to expand their offerings. In an effort to increase their marketability, these contractors are seeking certifications to broaden their knowledge base.