NFPA 70e Question

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brother

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Looking at the tabel 130.7(C)(9) Panelboards or other equipment rated 240 volts and below:

Why is it a HAZ RISK 1 When you remove bolted covers (to expose bare energized electrical conductors and circuit parts) But it is ONLY a haz risk 0 when opening hinged covers (to expose bare energized electrical conductors and circuit parts)???

Im just trying to understand the 70e safety committe reasoning. Looks to me that both should be Haz risk 1.
 
The reason is that there is more of a chance that you could contact an energized part in the panel that is removed by screws that would be the case for one that has a hinged panel.
 
Hazard Risk Categories (HRC) involve the possibility of creating a fault, like dropping a screw or a panel cover, as well as the possible magnitude of the incident energy.

The electrical industry typically mis-uses the term HRC to mean a list of appropriate PPE, as in "you need to wear HRC 1 clothing".
 
brother said:
Looking at the tabel 130.7(C)(9) Panelboards or other equipment rated 240 volts and below:

Why is it a HAZ RISK 1 When you remove bolted covers (to expose bare energized electrical conductors and circuit parts) But it is ONLY a haz risk 0 when opening hinged covers (to expose bare energized electrical conductors and circuit parts)???

Im just trying to understand the 70e safety committe reasoning. Looks to me that both should be Haz risk 1.
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Ever revome the bolts from a bolted cover and hear the dink, dink, dink sounds as the retaining hardware falls into the panel? There's your answer.

The tables factor in all sorts of things like risk, assumed working distance, and accident statistics to help determine the HRC's.
 
zog said:
Ever revome the bolts from a bolted cover and hear the dink, dink, dink sounds as the retaining hardware falls into the panel? There's your answer.

The tables factor in all sorts of things like risk, assumed working distance, and accident statistics to help determine the HRC's.
Click to expand...

Ok, I see. But I have heard of something going wrong when people just 'opened' the 'hinged' cover. So in my opinion the risk is still the same.
 
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