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2008 News Releases

For further information, contact: Madeline Foss, 763–574–5942

New automatic transfer switches meet strict UL 1008 standards for service entry loads

MINNEAPOLIS — Customers who depend on standby power can turn to Cummins Power Generation Inc. for UL 1008 listed and labeled service entrance transfer switches, required for emergency applications by NEC (National Electrical Code) rules, the company said today.

Newly introduced OTEC–SE and PowerCommand® OTPC–SE Automatic Transfer Switches (ATS) from Cummins Power Generation are engineered specifically for service entrance applications, and have been UL tested according to the rigorous standards of UL 1008 for emergency, legally required and optional standby power systems as defined by the NEC. Automatic transfer switches play a critical role in on–site emergency standby power systems by transferring electrical loads from the utility service to an alternative power source — such as a standby generator — after the primary source has failed. When the utility voltage stabilizes, the transfer switch returns the load to primary power.

Meeting UL 1008 standards may soon be a requirement in the wireless telecommunications industry, where regulations spurred by Hurricane Katrina would require cell towers and remote telecom facilities to have emergency backup power.

Karl Westenfield, director, ATS business, noted that some competing transfer switches meet UL 1008 requirements on the switch mechanism only. “Our new service entrance switches are the first to be UL–tested, listed and labeled for meeting UL 1008 standards on the complete, enclosed switch assembly. And our new automatic transfer switches are dedicated to service entrance applications, unlike some competitors who only offer service entrance capability as an option on standard switches,” Westenfield said.

Both models offer voltage ranges from 40 to 600 amps and ratings up to 480 VAC at 50/60 Hz. The new switches are more compact than competitive offerings, and feature withstand and closing ratings that are 1.5 to 2 times higher than comparable switches.

The new switches are field–configurable for in–phase or programmed transition. The controllers feature push–button controls for testing, for programming delays and for setting the exercise clock. LED indicators provide at–a–glance system status information on the transfer switches and the generator set.

Depending on application requirements, the PowerCommand® for the OTPC–SE is available in two configurations offering a wide range of event controls, phase sensing and timing options. Flash memory retains settings even if the switch loses power. Digital and bar–graph meter displays are available as options.

The new transfer switch products will begin shipping in June.

Hurricane Katrina drives telecom regulations

When Hurricane Katrina ravaged the Gulf Coast in 2005, wind and flooding knocked out hundreds of cell towers and cell sites, silencing wireless communication when emergency crews and victims needed it most.

In an effort to keep phone and wireless networks online during natural disasters, the Federal Communications Commission (FCC) is now requiring telecom and wireless companies to provide at least eight hours of backup power at most cell sites and remote telecom facilities.

The new rules, now under appeal in federal court, cover most local exchange carriers (LECs) and mobile service providers, who must provide backup power systems for central offices, cell sites, and remote switches and terminals. According to industry statistics, there are more than 210,000 cellular sites and about 20,000 telecom central offices in the United States.

NEC revises ATS codes

As of 2008, the NEC began requiring that transfer switches for emergency or legally required applications be UL–listed for those specific purposes. To be UL–listed, transfer switches must be tested according to the strict criteria listed in UL 1008.

NEC defines emergency systems as “those systems… intended to automatically supply illumination, power, or both, to designated areas and equipment in the event of failure of the normal supply or in the event of accident to elements of a system intended to supply, distribute, and control power and illumination essential for safety to human life.”

Legally required standby systems, as defined by the NEC, “are intended to automatically supply power to selected loads (other than those classed as emergency systems) in the event of failure of the normal source.”

Cummins Power Generation, a subsidiary of Cummins Inc. (NYSE: CMI), is dedicated to providing advanced low–emissions power generation solutions around the world. With over 80 years’ experience, the company’s global distributor network delivers innovative, reliable and cost–effective solutions for any power need — commercial, industrial, recreational, emergency and residential. Products include alternators, generator–drive engines, and temporary or permanent pre–integrated power systems, combining generator sets and power control and transfer technologies. Services range from system design, project management, financing, and operation and maintenance contracts to development of turnkey power plants.

For more information, contact Madeline Foss, Cummins Power Generation, 1400 73rd Ave. NE, Minneapolis, MN 55432. Phone: 763–574–5942; fax 763–574–5298.

©2009 Cummins Power Generation Inc. All Rights Reserved.