Difference Between a 220V & a 277V shock...

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don_resqcapt19

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Staff member
Location
Illinois
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retired electrician
yanici,
The loss of illumination exception only applies if the loss of illumination is a greater hazard than is working live. That would be a very rare case.
Don
 

yanici

Senior Member
Location
Atlantis
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Old Retired Master/Journeyman Electrician
Don, thanks for your answer, but I'm still lost on what OSHA says and what 70-E omits as an exception in regards to loss of illumination. 70-E clearly omits the illumination exception. I believe that 70-E wants you to either install temp lighting or schedule a shutdown when the lighting can be deenergized.
 

don_resqcapt19

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Illinois
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retired electrician
yanci,
One of the exceptions to working live in Osha is "loss of illumination for an area".
That exception only applies where the hazard from the loss of illumination would be greater than the hazard from working the circuit hot. That would be a rare case.
Don
 

jim dungar

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Staff member
Location
Wisconsin
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PE (Retired) - Power Systems
Under their "General Duty Clause", OSHA has the ability to cite any accepted consensus standard, and seems to do so whenever they can find a something more strict than their existing adopted rules. This is the way (i.e. loophole) they are able to enforce the most recent versions of NEC, NFPA70E and NFPA70B.

I suggest everyone read the forward to NFPA70E-2004 for a brief history of the effort for NFPA70E to be correlated with NEC and OSHA requirements.
 

muskiedog

Senior Member
Location
Minnesota
Osha

Osha

I have been through a few OSHA inspections and basically if it is a recognized hazard that you are aware of they will get you with the duty clause. I spent two weeks straight going through county facilities back in 2001. Ended up paying about $16,000.00 when everything was said and done.
 

realolman

Senior Member
ramsy said:
The 277vac sine wave originates from a 3-phase xfrmr peaking 3-times per 60Hz cycle vs twice for single-phase 240vac. So, peak power hits at least 33% more times during the entire contact duration.
.

No Comprendo ?
 

ramsy

Roger Ruhle dba NoFixNoPay
Location
LA basin, CA
Occupation
Service Electrician 2020 NEC
realolman said:
No Comprendo ?
Yes I see, feeling all phases shock you at once would require stuffing each phase in a different orifice.

Since, its a lot harder to get people to do that willfully or accidently, we'll just assume people prefer one phase at a time. Been visualizing phases on a scope; gota get my head outa the booby tube.
 
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ramsy

Roger Ruhle dba NoFixNoPay
Location
LA basin, CA
Occupation
Service Electrician 2020 NEC
realolman said:
I will consider it stuffed into at least one of my orifices.:D
LMAOL :D - I would ask for a picture, link, or code reference, but thats probably more information than I could handle right now.
 
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