Consulting-Specifying Engineer - September 2007 - (Page 61)

AERCO introduces new ways to win. Generators (Article 445) • 445.13: Ampacity of conductors. Conductors associated with generators that must carry ground fault current must be sized per 250.30(A), separately derived systems, instead of 250.24(c), grounding of services. • 445.19: Generators supplying multiple loads. This is a new subparagraph that permits a single feeder from the generator or paralleled generators to supply multiple loads to include emergency and standby loads, provided they terminate in a switchboard with individual disconnects for each of the loads. Healthcare facilities (Article 517) There are a number of clarifications specific to life safety in healthcare facilities in the new 2008 code: nection of loads listed under this subparagraph to the critical branch of the essential electrical system. Emergency systems (Article 700) A number of emergency and standby system requirements have been revised, including the following: • 700.9(D): Under circuit wiring for emergency systems, this text is revised to include fire protection requirements listed under 700.9(D)(1) and (D)(2) for feeders for essential electrical systems for hospitals and healthcare facilities. • 700.9(D)(3): Adds a new subparagraph stating that generator control wiring installed between transfer equipment and the emergency generator shall be kept entirely independent of all other wiring and shall meet 700.9(D)(1). This Winning at high-efficiency HVAC starts with one move: to AERCO. We’ve been the technology leader for decades with new products that keep widening the gap between us and the competition. Six condensing units deliver 300,000 to 1 million BTU/H with unmatched turndown, reliability, and whisperquiet operation. The 2008 NEC will be available for subsequent adoption at the state and local levels. Engineers should carefully review the code for applicability to their work and project types. • 517.26: The wording of this paragraph that was added in the 2005 edition has been revised to require only the life safety branch of the essential electrical system to meet the requirements of Article 700, Emergency Systems. This removes the requirement for the critical branch of a healthcare facility that serves patient care related circuits to comply with Article 700. • 517.32(E): Adds the requirement for battery-powered lighting units at essential transfer switch locations, as well as an indicator that this wording is the same as found in NFPA 99. • 517.32(c)(3): Adds new subparagraph to allow the mechanical equipment and controls required for effective life safety system operation to be connected to the life safety branch. This will allow the connection of smoke dampers and smoke control actuators initiated by the fire alarm system to the life safety branch. • 517.43(A) and (B): Revised text to delete the need for delaying the conaddresses the issue that the generator start circuit should have the same protection as the emergency system feeder wiring. Legally required standby systems (Article 701) • 701.7(c): Automatic transfer switches. The text has been revised to require automatic transfer switches rated 600 volts AC and below to be listed for legally required standby use. Optional standby systems (Article 702) • 702.5: Capacity and rating. This paragraph was expanded to create two applications, one for manual transfer and a second for automatic transfer. This is an effort to address installations where automatic transfer equipment is being installed with generators that have a capacity smaller than the total load. These systems must have adequate capacity for the supply of all equipment intended for operation at any one time. Our full line of steamto-water and waterto-water heaters now feature BAS-ready electronic controls for faster and more accurate performance. No one comes close to matching the 20:1 and 15:1 turndown of our newest 2 and 3 million BTU/H condensing boilers. Get the score at www.aerco.com/game2 Heat You Can Bank On Copyright 2006 AERCO International, Inc. Input #234 at csemag.com/quickResponse http://www.aerco.com/game2 http://www.aerco.com/game2 http://csemag.com/quickResponse

Table of Contents Feed for the Digital Edition of Consulting-Specifying Engineer - September 2007

Contents M/E Roundtable Cover Story: Airborne Superbugs Third-Party Liability Back to School Product Spotlight Codes & Standards Professional Practices How To New Products Jobs/Cliassifieds Specifier’s Notebook Pure Power Supplement New Technologies, Same Old Transmission Problems Wireless Battery Recharging Solar Concentration Renewables Tracking System A Mighty Wind The Importance of Load Bank Testing Quality Power for Security Systems

Consulting-Specifying Engineer - September 2007

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