Short Circuit, Coordination & Arc Flash Studies

SourceOne performs Short-Circuit and Coordination Studies to determine proper coordination of overcurrent protection devices. Lack of coordination between overcurrent devices can result in upstream devices opening and needlessly interrupting power in other parts of the electrical distribution system. The Short Circuit Study also calculates the worst case scenario fault current flowing through equipment and determines if the device is rated for this level of current.

This study answers questions such as:  

  • What size breakers and fuses should I install?
  • Is my panel rated for the amount of fault current available?
  • What are the appropriate settings for my protective devices?

SourceOne also conducts Arc Flash Studies and provides Arc Flash Training. The Arc Flash incident energy is calculated for the electrical system from the point of connection to the utility service, through the main service switchboards, downstream to switchboards, building distribution and branch circuit panelboards, and motor control centers under the guidance of NFPA-70E and utilizing the IEEE 1584 equations. Each piece of equipment is given an Arc Flash Hazard Rating based on the available energy, which determines the level of Personal Protective Equipment (PPE) required for live electrical work. Each piece of equipment is then labeled with this information. The study, equipment labels, and training provides a safety guide for personnel who are performing or supervising live electrical work.

Short Circuit, Coordination, and Arc Flash Studies are ideally performed in tandem. Arc Flash energy levels are determined by equipment type, available fault current and protective device clearing time. Protective devices that are incorrectly sized or incorrectly set can increase the Arc Flash Hazard in a facility, putting the safety of employees at risk.