Mersen - Improving Electrical Safety With Short Circuit Protection Seminar


  • Learn why NFPA70E has dropped the 240V exception for arc flash analysis and what to expect with proposed changes to the IEEE1584 exception referred to in the new FPN.
  • New incident energy equations being proposed for IEEE 1584 may provide different results than existing arc flash studies. Learn what “electrode configuration” means for the data collection step of your next analysis.
  • New information will be presented on coordination between fuses and upstream circuit breakers in the ‘short circuit’ region to address issues that can arise as settings of upstream devices are lowered to reduce arc energies.
  • Do some of your circuits have incident energies greater than 1.2 cal/ cm2 even when protected by dual element Class RK1 or J fuses? Or Class L. Learn why and what options you have to lower energies to “Category 0” Level.
  • Gain insight into what is meant by “exposed to the arc flash hazard” and who may be affected.
  • Are your control panels compliant with NEC 1110.10? NEC 409.22? Review some choices that ensure adequate ratings throughout the life of the panel.
  • Can your storeroom enhance your electrical safety program? Review a simple “5S” program to ensure safe fuse replacements.


Hazards of Overcurrents
  • How damage is caused by overcurrents
  • Hazards of short circuits and arc faults
  • Overview of High Energy Arc Behavior and Characteristics
Current Limiting Fuses are Energy Limiting
  • Current limiting Performance and Advantages
  • Dual Element, Time Delay, or Fast Acting?
Protecting Against Arc Flash Hazards
  • Overview of Arc Flash hazards
  • Factors affecting Arc Flash energies
  • Update on codes and standards
  • Reducing Arc Flash energy with current-limiting fuses
  • Proposed changes by the IEEE/NFPA Collaboration on Arc Flash Research Effort
  • More on the 240V Exception
  • to the arc flash hazard...?
Addressing Interrupting Rating Issues
  • Recommended upgrade for in-service fuses
  • Choosing the proper fuse Addressing Short Circuit Current Rating SCCR Issues
  • Overview of SCCR requirements
  • New industrial control panels requirements
  • Motor applications
  • Achieving Type 2 protection for motor starters
Addressing Coordination Problems
  • Selectivity coordination concepts and tools
  • Fuse systems and fuse/circuit breaker systems
Choosing a U/L Class as a Standard
  • Overview of fuse ratings and classifications
  • Choosing a U/L Class as a Standard
    • Safety and protection considerations
    • trategies for 5S’ing your fuse inventories and replacement ‘systems’


Mike Lang, Principal Field Engineer for Mersen, has written several Mersen White Papers on electrical safety topics and regularly conducts seminars throughout the southeast. He has coauthored several IEEE papers on arc flash including the First Place Papers at the 2006 PCIC Conference and the 2008 PPIC Conference and was awarded the 2011 I&CPS Ralph H. Lee Department Prize Paper Award for his work on 208V arc flash research. As leader of the arc flash team he has participated in over 1,000 arc flash tests in Mersen’s high power test lab.

Mike was a member of the Research, Test and Planning Committee for the IEEE/ NFPA Collaboration on Arc Flash Research and currently serves as co-chairman. He is a member of several committees including the IEEE 1584 Working Group and NFPA 110.

Kendall Electric
2310 Rossville Blvd
Chattanooga, TN 37408

April 16, 2019
9:30 am - 1:30 pm - Lunch will be provided

KCL Completed

This KCL is completed.


If there were any handouts or other downloadable materials links to them will be below.