Arc Flash Labels

What Are Arc Flash Labels:

Arc Flash Labels are warning labels that are required by OSHA and the NEC to be placed on any equipment that requires maintenance while energized. This usually includes equipment like Switchboards, Panels, and Motor Control Centers. Equipment that has no safe method of cover removal like Transformers do not require labels. Also Equipment That is easily de-energized like Disconnects, Starters and VFDs do not require labels as they should not be worked on while energized.

With that said, here are some must know items about arc flash labels to help you have a safer work environment today! 👊

1. Arc Flash Label Requirements

There are 2 types of arc flash labels, basic labels and comprehensive labels. Basic labels are only for 208 Volt panels. These labels have a warning information but no information about energy, PPE, or boundary information. For basic labels you should use the provided tables in NFPA 70E to determine proper PPE. Comprehensive labels are for 480 Volt panels. These labels have Shock Hazard Boundaries, Limited Approach, and Restricted Approach distances detailed on the bottom of the label. They also have Flash Hazard Boundary, Energy Levels, and PPE Requirements detailed. More on What all this means in the next section.

2. How to Read an Arc Flash Label

The image above is a Comprehensive Arc Flash Label, which we learned in the last section is required on Panels above 480 Volts. Now, we'll cover each piece of information in this label and what it means exactly. Lets start from the top.

• 24in Arc Flash Boundary: this is the distance where arc flash injuries will likely be limited to 2nd degree burns(1.9cal/cm^2). It is prohibited to work within the arc flash boundary (24in) without proper PPE.

• PPE: this lists all the required protective equipment needed to be worn when working on or near this label. It is important to note that Arc Rated PPE will not prevent injury, it only reduces arc flash energy to survivable levels. Another important note is that too much PPE can also be dangerous as it is more difficult to work in. Always use the appropriate level of PPE which is listed at the bottom (12 cal/cm^2).

• Shock risk and glove class: this tells you the energy level of the panel, and the thickness of insulated gloves required to open the panel.

• Approach boundaries: which are listed as 42 in for Limited Approach, and 12 in for Restricted Approach.

• Limited Approach: is the distance where shock hazard exists, non-qualified personnel that are not trained electricians are prohibited to approach within 42 inches of the label.

• Restricted approach: is the distance at which any work inside of can be considered the same as actual contact with the energized component.

The last section (12cal/cm^2) is the minimum arc rating which was covered in the PPE section. I hope that helps you better understand comprehensive arc flash labels, their importance, and how to read them. if you have any questions related to arc flash labels, please feel free to reach out via our form or give us a call. We are happy to help!