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SPECIFIER Technical Tuesdays Webinar

Specifier Technical Tuesdays webinars are held on a Tuesday every month and covers various electrical distribution topics. Sign up to register and receive notifications on the topic for each month. The archive section below provides access to previous webinars.

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Webinar Archive


Medium Voltage Relaying Applications - Differential Protection of Transformers and Switchgear | January 2016


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This discussion will educate the participant in the application considerations & benefits associated with differential protection of medium voltage switchgear and transformers. The discussion will focus on:

• The basics of differential protection – what is it, why use it, different types, benefits and when to use.
• Implementation - how many relays, where are they located, CT style, placement, saturation considerations and quantity.
• Impacts on incident energy reduction.



Design Guidelines for Safer, Low-Voltage Distribution Systems | November/December 2015



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Why is this topic important? The selective coordination of overcurrent devices in low-voltage distribution systems is a very desirable characteristic.  However, designing a system that is both selective and able to react to the currents of arc flash events is very challenging, particularly since it is difficult to predict intuitively what the arcing current will be at a given location without using sophisticated power system analysis software.  The arcing current calculations are just too complex. The guidelines provided in this presentation should help you design your unit substation equipment or low voltage service switchboard in a manner that would achieve the goal of selective coordination and arc flash current sensitivity.




Applying Switchgear vs Switchboards | October 2015


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Why is this topic important? When selecting the proper power distribution equipment for your particular project, it is imperative that the differences between switchgear and switchboard be considered. Good power system design includes knowing when to use switchgear or switchboards based on criteria such as the standards, economics, components, size, application needs and reliability. This session will provide an overview of these differences to help in making those decisions.




Evolution of Medium Voltage Switchgear | September 2015


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Why is this topic important? The increase of medium voltage service drops into facilities is driving user requests for enhanced equipment performance and expanded design capabilities. This webinar will provide an overview of medium voltage switchgear construction and discuss advancements in breaker technologies and design trends that should be evaluated when designing medium voltage switchgear equipment.





Applying the NEC 2014 Article 240.87 | August 2015


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Why is this topic important? Article 240.87 of the 2014 National Electrical Code requires the use of arc energy reduction methods where low voltage breakers that can be adjusted to 1200A or higher are installed.  This presentation will review how to properly apply this article and discuss important fundamentals related to protection for values of fault current associated with dangerous arcing events.  The focus will be on the implementation and operation of two specific methods cited in Article 240.87 – maintenance switching and zone-selective interlocking (ZSI). The differences between traditional short-time ZSI and instantaneous ZSI will also be highlighted.





30-Cyle ATS: Understanding Emergency  System Applications | July 2015


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Why is this topic important? This webinar will educate the participants in the following areas of the UL 1008 standard for an Automatic Transfer Switch (ATS) Withstand and Close Ratings (WCR). The mandatory and optional test options that exist under the standard; the 3-cycle and optional Short- Time Current Rating (STR) test. How the test options impact the ratings and the robustness of ATS. How a 30-cycle ATS is designed, to supply power to the load after a fault event. Application considerations around why and when to consider the use of a 3-cycle or 30 cycle Short-Time Current rated ATS.





Reducing Shock & Arc Hazards in LV Motor Control Centers | June 2015


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Why is this topic important? In 2014 IEEE incorporated Standard 1683-2014 for Motor Control Centers rated up to 600V AC or 1000V DC. This standard is intended to augment the existing Motor Control Center standards such as, UL 845 or NEMA ICS 18 or CSA C22.2 No. 254 for example, as well as other Motor Control Center design, manufacturing, and application standards. The description states the standard provides recommendations for design practices to reduce the possibility of shock and arcing hazard. Join us to look at some of the design changes and enhancements GE is incorporating in our Low Voltage Motor Control Center product to address the new standard.





2016 DOE Transformer Efficiency Changes | May 2015


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Why is this topic important? The Department of Energy (DOE) regulates the energy efficiency level of low-voltage general purpose dry-type transformers, liquid-immersed and medium-voltage dry-type distribution transformers. Beginning in 2016, there will be newly amended energy efficiency standards for distribution transformers. The new amendments to the existing efficiency standards will further decrease electrical losses thus reducing carbon dioxide emissions. Join us for a technical overview and GE’s interpretation of the new transformer efficiency requirements as they relate to low-voltage general purpose dry-type transformers.