Here’s a clip of the 208 V section, with the inputs and outputs highlighted.Ĭolumns 1-3 show the inputs, in which you select these properties: How Do I Use Table v.1 to Determine Arc Flash PPE? It is based on the most up to date methodology for calculating arc flash, using IEEE 1584-2018 equations.īy assuming the worst case for the more difficult and less impactful parts of the calculations, it is able to reduce the complexity and time required if you need to know your hazard quickly. It’s in Annex V, starting page 202, and is called Table V.1: Arc-flash PPE categories for alternating current (ac) systems. In 2021, CSA Z462 released a new edition and added a new Table V.1 to that’s very easy and safe to use for determining arc flash PPE. What Arc Flash PPE Is Required, if There’s No Label? Now with all that, let's answer the main question. These arguments may have some truth to them but the actual hazard could easily be higher.īack to the main question: What arc flash PPE is required, if there’s no arc flash labels? You can’t necessarily check an identical piece of equipment. You can’t necessarily check the upstream equipment and assume the hazard is equal or lower. The information in other labels on your site certainly have a method to them, but trying to interpret how or why one piece of equipment is high or low versus another is difficult. This is a calculation method based on arcing tests measuring how much thermal energy is released in a short time during an arc flash.īoth standards also have an alternative method using tables, but still require knowing the short circuit current and the how quickly your breakers and fuses will trip.īoth fairly difficult to determine without practice.īack to the main question: What arc flash PPE is required, if there’s no label? Can You Figure Out the Hazard Using Information From Similar or Nearby Equipment That Have Labels? The standard for guidance on electrical safety in the workplace is CSA Z462 in Canada and NFPA 70E in the United States.īoth of these standards recommend an arc flash hazard study based on IEEE 1584-2018. This is when your site’s electrical system is modelled and the short circuit and arc flash hazard is calculated at every piece of equipment that may be worked on live.īack to the main question: What arc flash PPE is required, if there’s no label? Is There Any Other Way to Know My PPE Is ‘Good Enough’? The main method of determining the hazard is through an arc flash hazard study. It is the reponsibilty of the employer to provide the hazard information to anyone required to work on the site’s equipment. So even if you’re turning off the power upstream to work on your equipment, lock it out and test before touch! This means wearing ‘good enough’ PPE for the task at hand, even if it’s just until you test zero volts.įor arc flash hazards that means covering any exposed skin with PPE rated to the arc thermal protective value equal to the worst case incident energy possible during a fault on your equipment.īack to the main question: What arc flash PPE is required, if there’s no label?Īlso read our previous blog How to label an electrical panel? Who’s Responsible for Providing Arc Flash Hazard Information? Remember, equipment is considered live until proven dead. THE ULTIMATE GUIDE TO IMPROVE ELECTRICAL SAFETY IN YOUR WORKPLACE ĭo I Need Arc Flash PPE if I Turn off the Power?Īrc flash personal protective equipment (PPE) is critical to your safety when working on three phase industrial electrical equipment. What arc flash PPE is required, if there’s no label? This is a great question!īut first let’s answer some of the questions you may have answered to get here.
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