Consulting-Specifying Engineer - October 2008 - (Page 28)

If the design includes a horizontal exit and the sprinkler contractor isn’t informed that additional hose valves are required, that could create a costly change order. Elevators One common example of coordinated fire protection aspects is elevator systems. Although they are not typically thought of VFD-Induced Bearing Currents Kill Motors! Protect Bearings, Prevent Motor Failure! BEARING PROTECTION RING Safely channels harmful currents away from bearings to ground Easy field or OEM installation — in just minutes Maintenance-free, contaminationproof, lasts for life of motor Standard sizes for any motor Split mounting kit simpliﬁes ﬁeld installation on NEMA or IEC motors including those with shaft shoulders, slingers, or other end bell protrusions To download a free technical paper on bearing protection technologies, visit our website: 1-866-738-1857 | sales @est-aegis.com www.est-aegis.com/cse2 Input #217 at csemag.com/quickResponse this way, elevators constitute highly sophisticated fire protection systems. This is often overlooked because the required protection is so ingrained into codes and standards that there are rarely issues serious enough to hold up building occupancy. The standard prescriptive fire protection aspects for elevators in major facilities include: • The 2-hour hoistway with 1.5-hour automatic sliding hoistway doors • A maximum of four cars per hoistway • Automatic opening hoistway vents • Smoke detector activated recall with primary and secondary levels • Generators to provide secondary power • Air conditioning systems serving the machine room to protect the sensitive electronics • Emergency responder and public use two-way communication systems • Emergency responder manual overrides • Status panels in the fire command center (FCC). If sprinklers are installed in the hoistway and/or elevator machine room, heat detector activated shunts are required to de-energize power to all elevators in the respective hoistway(s). At times, elevator lobbies are required to reduce the potential for smoke migration from floor to floor. This also can be accomplished by pressurizing the hoistway relative to the landings on each floor. Lately, there is a movement to provide additional protection for emergency responders by requiring fire-resistive elevator lobbies at each floor level. To protect the sensitive electronic equipment in the machine room from smoke, Clark County has historically considered an elevator machine room a separate smoke zone from the associated hoistway(s). Standard practice to reduce smoke migration through cable slots in the floor has been to pressurize the machine room relative to the hoistway. From the preceding description, it becomes quite clear that elevators constitute holistic fire protection systems. The reason this complexity typically isn’t a prob- 28 Consulting-Specifying Engineer • OCTOBER 2008 http://www.est-aegis.com http://www.est-aegis.com http://www.csemag.com/quickResponse

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Consulting-Specifying Engineer - October 2008 Contents Viewpoint Letters News M/E Roundtable Cities Under One Roof Eight Design Tips for Integration Is 'Green' Really New? Down the Drain Product of the Year Awards Codes & Standards Case Study New Products Equipment Lifecycles Advertiser Index Green Space

Consulting-Specifying Engineer - October 2008

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