A tested method for mitigating arc flash hazards in existing low voltage motor control centers

This paper develops a practical, cost-effective method of retrofitting existing low voltage motor control centers to reduce the arc flash energy for open door work to a much safer level. These self-extinguishing solutions are designed to reduce the arc flash energy from a calculated value in excess of 40 calories per square centimeter (cal/cm
²
) at an 18 inch working distance to an average tested value of less than 1 cal/cm
²
. The research presented focuses on the low voltage motor control center where technicians perform troubleshooting tasks on a daily basis with the motor starter door open and the circuit energized. The paper discusses engineered and tested modifications that will greatly improve the safety of the low voltage motor control center with little procedural change for the technician in the field. These solutions allow the process owner the option of upgrading existing equipment to extend the operating life of the equipment while addressing safety issues and reducing mean time to repair.