![]() ![]() It is important to note that he exact method of calculation is different for DC and AC systems, so it is critical to have the above information available. Armed with all of that vital information, workers are able to accurately find what the arc flash boundary is. Whilst there are differing methods available for finding out an arc flash boundary (NFPA 70E or IEEE 1584), the main variables to consider is the voltage, the level of local grounding versus high resistance, the time available for arching before the protective equipment of the equipment activates, the type of equipment, conductivity gaps, and the size of the three phase fault. These boundaries are put in place to minimise worker’s risk to harm through avoidance or the use of PPE. Each boundary triggers different requirements in NFPA 70E, including determining the type and level of PPE that workers must wear and the qualifications required to cross into each level. ![]() These are the shock protection boundaries - limited approach and restricted approach - and an arc flash boundary. The National Fire Protection Association (NFPA) 70E states that there are three boundaries to observe. How are Arc Flash and Electric Shock Protection Boundaries determined? No workers should pass an arc flash boundary without having first undertaken the necessary training and donning the required PPE. That is the distance where a worker without wearing the appropriate level of personal protective equipment (PPE) would receive second degree burns. What are Arc Flash Boundaries?Īn arc flash boundary depends on the potential arc flash hazard and is calculated to 1.2 calories/cm2 of incident energy. Workers should know exactly where the arc flash boundary is and keep this safety measure in mind at all times. ![]() It is important to take the proper steps to ensure worker safety before taking any measurements, especially on energised equipment. Also known as a flash protection boundary, an arc flash boundary specifies the minimum safe distance from exposed energised conductors or circuit parts that have the potential for an arc flash event. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |