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.
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.
At the recent Power Quality World Conference, I chaired a session on “Specifying and Purchasing PQ Equipment.” Afterward, I met one of the presenters from an electric utility who said he planned to bring his lawyer with him to the session the next day.
A couple of months ago we dealt with lightning and the fast transients that can be coupled onto the electrical distribution system of the utility or within a facility, and the use of TVSS (transient voltage surge suppressors) to minimize the potential damage from such.
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
In 2001, PFPC Inc., a leading provider of processing, technology and business solutions to the global investment industry and a member of the PNC Financial Services Group Inc., decided to expand its operations by adding a four-story, 116,000-square-foot worldwide headquarters building to its existi
One of the most power-quality aware industries is the financial market, as it is one of the most dependent on the uninterruptible operation of computer and communications technology equipment for their business to generate “positive money.” It is not surprising that many of the members of the 7x24
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).
Though lightning season may be over by now, it is worth reviewing the impact storms can have on the operation of a facility. Some may have experienced significant damage to equipment from the high frequency transient energy of lightning strikes.
The Telecommunications Industry Association (TIA) is an industry organization with paying members from the communications/telecom industry. They develop minimal performance standards for cabling and related hardware and installation standards for the users/designers.
210.70(A)(2) Lighting Outlets Required Branch circuit requirements are covered in Article 210 of the National Electrical Code. Part III of Article 210 covers required receptacle outlets and lighting outlets.