Proper planning ensures that today’s investments will provide lasting value into the future.Compliance Director, Andy Linley, discusses Arc Flash Boundary distances, what they are and factors affecting them. Our cable testing allows utilities to easily measure the health of their systems and insure against premature, costly replacements. Other diagnostic tests often apply 150% of the cable’s voltage rating, further stressing the cables and accelerating deterioration.Ĭable deterioration leads to system failure and poor reliability. Based on the DC Polarization/Depolarization Current Measurement principle, it’s a non-destructive method that applies a maximum of 30% of the cable’s voltage rating. This unique, on-site diagnostic service determines the health of XLPE cables while preserving their integrity. We have partnered with National Research Council Canada (NRC), the Government of Canada’s premier research and technology organization, to diagnose the health of XLPE cables without damaging them. So, for example, if the flash protection boundary is greater than the limited approach boundary then no unqualified person can be permitted in the limited approach area and even qualified workers must wear appropriate arc-resistant PPE.Įnergy Ottawa offers a state-of-the-art, non-destructive cable measurement system for the dependable assessment of medium voltage distribution cables. The arc flash protection boundary and the rules governing access within it take precedence over the shock hazard boundaries. It is ensured that electrical workers use the correct equipment and follow precise procedures when in the proximity of live electrical equipment.The electrical worker has been properly trained and equipped with appropriate Arc Flash PPE.The qualified electrical worker has been trained and is authorized to conduct work on live electrical equipment.The electrical work has been documented through an energized work permit.A responsible and trained person has carried out a full risk assessment.Under no circumstances, should an electrical worker (qualified and/or unqualified) enter the prohibited approach boundary, unless: In terms of arc flash/electrical safety, any electrical worker crossing the Prohibited Approach Boundary must be protected as if they were protected for making direct contact with the exposed live equipment.Įstablishing these Arc Flash boundaries is considered the best way to protect workers from the dangers of electrocution and arc flash injuries. Some equipment will have a greater flash protection boundary while other equipment will have a lesser boundary. This distance is not common between equipment. The Prohibited Approach Boundary is defined as a distance from an exposed part which is considered the same as making contact with the live part. The Restricted Approach Boundary is defined as approach limit at a distance from an exposed live part which there is an increased risk of shock.Īrc Flash Prohibited Approach Boundary (inner boundary) Where there is a need for an unqualified person(s) to cross the Limited Approach Boundary, NFPA 70e dictates that a qualified person shall advise him or her of the possible hazards and continuously escort the unqualified person(s) while inside the limited Approach Boundary. The Limited Approach Boundary is defined as an approach limit at a distance from an exposed live part where a shock hazard exists. If an arc flash explosion occurs within this boundary, it is considered that an electrical worker would be exposed to a curable second degree burn (1.2 calories/cm2 ). ![]() The Flash Protection Boundary is the calculated safe working distance from electrical equipment which would not expose the employee to the hazards associated with an electrical arc flash. Arc Flash Prohibited Approach Boundary (inner boundary)Īrc Flash Protection Boundary (outer boundary). ![]()
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