Arc Flash

Five to 10 arc flash explosions occur in electrical equipment every day in the United States, according to a report from CapSchell, Inc., a Chicago-based research and consulting firm that specializes in preventing workplace injuries and deaths. More than sufficient time should be spent designing and evaluating high amperage circuit breakers and other products to limit the arc flash incident energy and provide the highest protection to workers inside the arc flash boundaries. Additionally, organizations should provide safety training, preventative maintenance services and other options that can help companies reduce the threat from electrical incidents within their facilities.

The National Fire Protection Association (NFPA) describes an arc flash as "a dangerous condition associated with the release of energy caused by an electric arc." It is caused by a reduction of the insulation or isolation distance between energized components. This could be caused by a tool being inserted or dropped into a breaker or service area, or other elements that may be accidentally left behind that could compromise the distance between energized components. Often, incidents occur when a worker mistakenly fails to ensure that the equipment has been properly de-energized.

Arc flash incidents typically occur in applications above 120V and can occur when electrical equipment is being serviced or inspected. An arc flash can cause serious equipment damage and render the equipment no longer usable, causing a disruption of a facility's operation for hours or days, depending on the equipment, its age and how quickly service can be restored. The explosion also can completely destroy the equipment, leaving it unsuitable for service.

These are some of the critical reminders to industry workers and others:

* Establish a facility electrical safety program with clearly defined responsibilities.

* Appoint an electrical safety program manager.

* Conduct an electrical system engineering analysis to determine what degree of arc flash hazard is present.

* Conduct safety training for all workers.

* Ensure you have an adequate supply of properly rated protective clothing and equipment on hand.

* Ensure that you have the proper tools on hand for safe electrical work.

* Apply warning labels to all equipment.

* Properly maintain all electrical distribution system components.

* Update and maintain all electrical distribution documentation.

Feel free to contact a Jacman Group expert for more information.