The second method of determining arc flash boundary is determining which of the four categories (CAT I, II, II, & IV) of PPE is required. It's important your equipment is labeled accordingly so anyone working on it will know what level of PPE to don.

Personal Protective Equipment (PPE)

Based on your findings above, the next step is the selection of PPE for the appropriate working condition. PPE clothing has advanced significantly over the years. Modern PPE is much more lightweight and comfortable than years prior. Face shields are to have wrap-around guarding to protect not only the face but also the forehead, ears, and neck. If rubber insulating gloves with leather protectors are used, additional leather or arc-rated gloves are not required.

The combination of rubber insulating globes with leather protectors satisfies the arc flash protectors required. Safety glasses/goggles have to always be worn under the face shields or hoods. Employees also have to wear hearing protection whenever working within the arc flash boundary.

Permanent Electrical Safety Devices (PESDs)

Charles concluded the presentation with a shout out to our GracePESDs and how they can affect safety in all the situations that would normally require PPE.

"Voltage indicator lights typically do not meet the requirement of 110.5(7) Exception No. 1; the absence of voltage test. Now, Grace Engineered Products, you're probably familiar with their products, they're called Permanent Electrical Safety Devices or PESDs. We've seen these in industries around the country, industrial plants; they're wonderful. An electrician or maintenance person walks by and they see the three lights up there going that's good power's there. It's a great indication, a voltage indicator. But  when you turn off a piece of equipment, those lights go out. When we're going to get into a piece of equipment, we have to go through some additional steps other than just plain Lockout/Tagout. We have to go through these additional steps for testing for the absence of voltage. But Grace has another option and this is wonderful, I think this is better than sliced bread. This is a great option."

The other "great" option Charles is referring to is to install a Safe-Test Point to test for the absence of voltage while standing outside the electrical equipment before opening the equipment up. What this allows a qualified person to do is while they're standing outside with the power turned off, having gone through the steps, they get to step number seven and safely test for the absence of voltage.

Once the equipment has been established and verified that it is in an electrically safe work condition, a qualified person can theoretically open the equipment up without wearing shock or arc-rated PPE. I say "theoretically" because as a safety conscious company, we don't want to outright tell people they don't need to wear PPE; that decision alone should be defined within their facility's electrical safety program.