Understanding NFPA 70e

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brother

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"I have learned, in whatsoever STATE I am, therewi
Well been trying to increase my knowledge on NFPA 70e, but having some trouble.

If you are working on 120/240 residential hot work, what ppe do you need? What HRC does it fit?? I assume the of course the safety glasses, face sheild and high voltage gloves with leather protectors, and cotton shirts and jeans.

Im looking the 'easy' chart that use to be online.
 
brother said:
. . . and high voltage gloves . . .
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I am not very familiar with 70E so if I make a misstatement, I assume someone will correct me.

First, I do not believe 70E applies to residential work (that is a guess). Additionally, why use high voltage (medium voltage) gloves when low voltage gloves are applicable to your work? Also, if the equipment you are working on is not energized, why do you need this PPE at all? For residential work, most of the time, there is no reason to work hot. :)
 
charlie said:
For residential work, most of the time, there is no reason to work hot. :)
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You hit the nail on the head, unless the home has someone in it on life support all residential work must be done de-energized according to the NFPA 70E.

Yes 70E applies to all employees of companies electricians and nurses, resi and industrial.
 
working hot

working hot

charlie said:
I am not very familiar with 70E so if I make a misstatement, I assume someone will correct me.

First, I do not believe 70E applies to residential work (that is a guess). Additionally, why use high voltage (medium voltage) gloves when low voltage gloves are applicable to your work? Also, if the equipment you are working on is not energized, why do you need this PPE at all? For residential work, most of the time, there is no reason to work hot. :)
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I see very little reason to "work it hot" in commercial, but continue to see guys doing it. I guess they are afraid they will disturb someone's computer game!:D
 
zog said:
You hit the nail on the head, unless the home has someone in it on life support all residential work must be done de-energized according to the NFPA 70E.

Yes 70E applies to all employees of companies electricians and nurses, resi and industrial.
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Thanks, electric utilities are generally exempted from the requirements of 70E and we are covered by the NESC so I don't know as much about the requirements.

I was also thinking about testing circuits for voltage and/or current in various equipment that would need to be done with the power applied. :smile:
 
charlie said:
I am not very familiar with 70E so if I make a misstatement, I assume someone will correct me.

First, I do not believe 70E applies to residential work (that is a guess). Additionally, why use high voltage (medium voltage) gloves when low voltage gloves are applicable to your work? Also, if the equipment you are working on is not energized, why do you need this PPE at all? For residential work, most of the time, there is no reason to work hot. :)
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Im not working anything 'hot', just trying to see how apply the 70e charts. They is just a hypothetical situation. The only reason i see to do hot in residential is if you are testing the voltage to see what reading you get.
 
Brother,
In looking at a chart for Arc-Flash Incident Energy If you are in the panel
and its 200 amp rated @ 10kA short circuit then you will have a 0.81
cal/cm squared of energy. When applied to the PPE chart it indicates a "0"
which gives long sleeve shirt, safety glasses and long cotton pants. I
would go back over the issue of the arc flash face shield it may be over-kill.

The home recepticles are not covered, but the above would certainly be
the best suitable. The only way you can work in the main panel with out
any PPE is with the meter base pulled. The safety glasses are a must anyway.
Good luck
 
charlie said:
Thanks, electric utilities are generally exempted from the requirements of 70E and we are covered by the NESC so I don't know as much about the requirements.

I was also thinking about testing circuits for voltage and/or current in various equipment that would need to be done with the power applied. :smile:
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They have dodged the 70E requirements for the last few years but thier time is up , 70E requirements are being rolled into the NESC this year and will be enforeced ASAP. Or course the rules will be tweaked a little, as they should for utillities.

That dosent mean they will be less stringent, they will be different. Utillity workers have known more about arc flash/shock protection, PPE, and energized work than 99% of other electrical workers out there as long as electrons have transfered thier energy through and over copper, so different assumptions will be made when 70E rolls into the NESC.
 
jahrtrix said:
Brother,
In looking at a chart for Arc-Flash Incident Energy If you are in the panel
and its 200 amp rated @ 10kA short circuit then you will have a 0.81
cal/cm squared of energy. When applied to the PPE chart it indicates a "0"
which gives long sleeve shirt, safety glasses and long cotton pants. I
would go back over the issue of the arc flash face shield it may be over-kill.

The home recepticles are not covered, but the above would certainly be
the best suitable. The only way you can work in the main panel with out
any PPE is with the meter base pulled. The safety glasses are a must anyway.
Good luck
Click to expand...

Dont know where you got this chart from but the rating and AIC of the panel have nothing or very little to do with the arc flash hazard.
 
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