Switchboards, panelboards, industrial control panels, meter socket enclosures, and motor control centers that are in other than dwelling occupancies and are likely to require examination, adjustment, servicing, or maintenance while energized shall be field marked to warn qualified persons of potential electric arc flash hazards.
The marking shall be located so as to be clearly visible to qualified persons before examination, adjustment, servicing, or maintenance of the equipment.
FPN No. 1: NFPA 70E-2004, Standard for Electrical Safety in the Workplace, provides assistance in determining severity of potential exposure, planning safe work practices, and selecting personal protective equipment.
FPN No. 2: ANSI Z535.4-1998, Product Safety Signs and Labels, provides guidelines for the design of safety signs and labels for application to products.
At the time of inspection, a warning label must be attached. Brady , Panduit & others make them. At least one manufacturer supplies a label with some of their panelboards. Some of the label examples I've seen have fill in blanks for available fault current, level of protective gear required, but this information is not required by 110.16 and should not be presumed to be factual except the day the calculation was done.
I don't know what we'll do about marking meter sockets. These are furnished by the power company in our area and on the 100 amp size, there isn't very much room for a label on the front cover. I wouldn't consider the side of the meter enclosure to be clearly visible under all conditions. Even though the power company employees should know the dangers, it never hurts to give someone a reminder.
Few things are harder to put up with than the annoyance of a good example.
I write it up on basically every power inspection I do. I always make it a point to write the reference of 110.16 so the electrician can read teh text to know exactly what th erequirement is.
Just a side note though: If a person meets the definition of "qualified person" and therefore knows the risks involved and has had safety training, why do we need a sticker "...to warn qualified persons of potential electric arc flash hazards"? Seems like a silly rule to me
I would have to ask then, how did they become a "Qualified Person" and how likely is it that this person would be able to truly meet the criteria and continue to educate themselves in order to be recognized as a "Qualified Person"?
Not saying it couldn't be done but IMO it would be a far stretch of the imagination.
BTW, are the NFPA codes available on cassette for listening while driving down the road?
No Joe, I didn't send in a proposal, but I think I may for the 2008. In my opinion, you could put a sign on the panel that says "WARNING: IF you touch this you will die". It still won't change anything...ask the few million cigarette smokers in the world that look at the surgeon general's warning every time they light up.
Joe, I did submit a comment on this issue when it was proposed for the '02 code. The original proposal called for the field applied label to contain that actual arc fault information. My comment was opposed based on two things. First, such calcualted values may not be valid in the future and if too low could lead someone to not use enough PPE. Second, the only people that would know what this label means, are people who already know what types of PPE are required. At this point, where no calculations are required to be posted, I fail to understand why the rule requires a field applied label. Why not just have the manufacturer apply the label when the product is made? Don