The subject of arc-rated clothing is confusing to many, partly because the requirements have been evolving.
This Annex helps you make the correct selection. It refers you to the tables in 130.7(C)(15). Those tables are much easier to understand and apply than their earlier counterparts were. The (a) and (b) tables are for AC and DC systems, respectively. The three columns in each one are the equipment (e.g., panelboards, metal-clad switchgear, etc.), arc flash category, and arc flash boundary. You would use the appropriate (a) or (b) to determine the arc flash category, then turn to the (c) table to determine the minimum personal protective equipment (PPE). That’s actually pretty simple when you think about it.
The Annex also contains Table H.2, which illustrates the simplified two-category, arc-rated clothing system. The two categories are everyday work clothing and arc flash suit. Also pretty simple. H.4 discusses the supplier’s declaration of conformity, which is essentially documentation showing that specific article of PPE meets specific criteria.
This Annex doesn’t take long to read and it gives you a good framework for applying 130.7, which does take long to read. And you can’t just pick 130.7 out of context. You need to work your way through it starting with 130.1. Using the Annex to give you the framework for the PPE selection will help you overcome confusion and make the correct selection.
