Cookie policy: This site uses cookies (small files stored on your computer) to simplify and improve your experience of this website. Cookies are small text files stored on the device you are using to access this website. For more information on how we use and manage cookies please take a look at our privacy and cookie policies. Some parts of the site may not work properly if you choose not to accept cookies.

sections

Cummins claims "unprecendented" safety rating for switches

  • Print
  • Share
  • Comment
  • Save

Minneapolis based Cummins Power Generation's transfer switches received unprecedented "withstand and closing" ratings from a U.S. product safety testing and certification company after being tested for their ability to surive sever levels of short circuit, the company said.

The open transition and closed transition switches demonstrated short-time ratings of 25 kA at 10 cycles for 125- to 260-amp switches, 30 kA at 30 cycles for 300 to 600 amps, and 50 kA at 30 cycles for 800-amp switches in tests designed by Underwriters Laboratories.

After testing, the switches operated at full load safely.

"They were undamaged," Cummins Director of Power System Development Gary Olson said. "They could take the short circuit, conditioned for 30 cycles... (and) still carry rated load."

The product was designed for use in data centers, banks, government office buildings, as well as in hospitals and emergency shelters. It is not however, appropriate for large data centers.

"This would probably suit more mid- to smaller-size data centers," Olson said.

The UL rating validates the product in the eyes of engineers as an "independent assurance" of its high performance level, according to a Cummins statement.

Specifying transfer switches' UL ratings also helps engineers with selective coordination, the process of selecting circuit breakers and transfer switches with a combination of timing and withstand parameters that allows for localization of an overcurrent condition by delaying or preventing current faults from tripping upstream protection devices.

"As he's designing protection for his system, (an engineer) wants to make sure that (in case of a fault), the only breaker that trips is the closest upstream to the fault," Olson explained.

With a transfer switch capable of withstanding fault current for up to 30 cycles, the engineer can adjust time delay on the overcurrent protection device to prevent upstream breakers from tripping unnecessarily.

The U.S. National Electrical Code can require selective coordination in electrical systems of data centers, banks, government offices, hospitals and emergency shelters.

Have your say

Please view our terms and conditions before submitting your comment.

required
required
required
required
required
  • Print
  • Share
  • Comment
  • Save

Webinars

  • Next Generation Data Centers – Are you ready for scale?

    Wed, 24 Aug 2016 16:00:00

    This presentation will provide a general overview of the data center trends and the ecosystem that comprises of “hyperscale DC”, “MTDC”, and “enterprise DC”.

  • White Space 47: There's a Pokéstop outside our office

    Fri, 22 Jul 2016 10:35:00

    This week on White Space, we talk everyhting: > Pokémon > Microsoft's Azure Stack launch > DatacenterDynamics Awards 2016 program > Digital Realty's move into Wind Power

  • White Space 46: We'll always have Paris

    Fri, 15 Jul 2016 10:35:00

    This week on White Space, we look at the safest data center locations in the world, as rated by real estate management firm Cushman & Wakefield. It will come as no surprise that Iceland comes out on top, while the US and the UK have barely made the top 10. French data center specialist Data4 is promoting Paris as a global technology hub, where it is planning to invest at least €100 million. Another French data center owned by Webaxys is repurposing old Nissan Leaf car batteries in partnership with Eaton. Brexit update: We’ve also heard industry body TechUK outline an optimistic vision of Britain outside the EU – as long as the country remains within the single market and subscribes to the principles of the General Data Protection Regulation.

  • Powering Big Data with Big Solar

    Tue, 12 Jul 2016 18:00:00

    The data center industry is experiencing explosive growth. The expansion of online users and increased transactions will result in the online population to reach 50% of the world’s projected population, moving from 2.3 billion in 2012 to an expected 3.6 billion people by 2017. This growth is requiring data centers to address the carbon impact of their business and to integrate more renewable resources into their projects. Join First Solar to learn: -Why major C&I companies are looking to utility-scale solar as a viable addition to their energy sourcing portfolios. -How cost-effective utility-scale solar options can support datacenters in securing renewable supply. -Case study of how a major data center player implemented solar into their portfolio

  • DC Professional - Meet John Laban

    Tue, 12 Jul 2016 15:25:00

    John has worked in the Telecommunications and Information Transport Systems (ITS) industry for over 35 years, beginning his career at the London Stock Exchange as a BT telecommunication technician. Believing there was a general lack of quality in the ITS industry, John was driven to "professionalize" the ITS industry – starting with a professional diploma programme for the Telecommunications Managers Association – which led to him becoming the first BICSI RCDD in the UK and soon after, a BICSI Master Instructor teaching RCDD and Technician programmes. Find out more about John and upcoming sessions here https://www.dc-professional.com/people/284/

More link