What is Arc Flash?
Arc flash, also called a flashover, is the light and heat produced as part of an arc fault, a type of electrical explosion or discharge that results from a low-impedance connection through air to ground or another voltage phase in an electrical system.
Legal Issues and Employer Responsibilities
- OSHA arc flash protection questions and answers – Read more
- OSHA issues this ESA safety bulletin which explains the employer’s legal responsibilities for arc flash safety programs and the nuances of OSHA enforcement and compliance and how it relates to NFPA 70E and IEEE standards – Read more
Arc Flash Center Safety Training and Certification
National Fuse Products offers customized safety training programs for your workers several times during the year. The instructor Jack Bene is a National Electrical Codes Instructor (licensed by the State of Ohio) and has completed over 125 flash studies for commercial and industrial facilities. In addition, Jack has trained several hundred companies on arc flash hazards, shock and electrocution hazards, grounding, over current protection and general national electrical code topics. You can view Jack Bene’s complete curriculum vitae. Interested in attending an arc flash training seminar? You can either email Angie Graham at firstname.lastname@example.org or fill out our form on the Contact Us page.
Selecting Personal Protective Equipment (PPE)
Making personal protective equipment available for your workers is the responsibility of the employer. This informative article outlines the new arc flash PPE tables of the NFPA 70E 2018 Edition which is helpful in selecting the proper protection. As a licensed distributor of Cementex, National Fuse Products is proud to offer their fire resistant clothing and safety equipment. Click here to view the entire line of personal protection equipment we can order for you. For sizing of gloves or FR clothing, please see the following guides:
- Glove Sizing
- Glove Sizing (Spanish)
- FR Clothing (“Contractor Series” and “O Series”)
- FR Clothing (“C Series” and “RevoLite Series”)
- FR Clothing (“HRC Series” and “E Series”)
Another valuable protection device is the Fluke Infared Viewing Window which allows IR inspections without exposing your personnel to possibly catastrophic or fatal incident energy levels.
Reducing Arc Flash Hazard Using Current Limiting Fuses
The fuse industry has responded with new classes of fuses that reduce the incident energy, and the radius of any arc flash blast – which improves safety and reduces the level of personal protective equipment that workers are required to wear. National Fuse supplier Mersen, a world leader in current limiting fuses has four classes of current limiting fuses. Mersen arc flash fuses are type-2 no-damage circuit protection and are available in: Class CC, Class J, Class RK5, and Class L. Opening in less than quarter cycles under short circuit conditions, Mersen fuses limit enough current to prevent down time and arc flash damage. This arc flash calculator shows the benefits of Mersen current limiting fuses. The calculator uses IEEE calculations for the incident energy – which is much lower than older fuses – and references the level of PPE required which is less restrictive and more comfortable for your workers. The universal Class RK1 product family replaces a wide array of older fuses — and results in the least prohibitive NFPA70E arc flash boundary.
Additional Arc Flash Resources
- Arc Flash Resource Center from our partner and fuse supplier Mersen (Ferraz-Shawmut)
- Littelfuse Electrical Safety Handbook from our partner and fuse supplier Littelfuse
- DuPont engineer Ralph Lee, known as the “father of arc flash” uncovers the physics, mathematics, impact on human tissue and clothing, and recommendations for protective equipment for arc flash in his 1981 original article titled “Pressures Developed By Arcs – View article
- Chet Davis, president of ESA, documents the top misconceptions about arc flash safety – View article
- Article “Compliance Takes More Than a Label” – View article