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 Post subject: Shock Hazard Assesment
PostPosted: Fri Jul 19, 2019 3:27 pm 

Joined: Tue Dec 02, 2014 7:46 am
Posts: 14
Does it require to mention Shock Hazard Boundaries on an Arc Flash label?

What is the best practice to document Shock Hazard Assessment?

Does the result of the assessment need to be affixed on equipment?


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 Post subject: Re: Shock Hazard Assesment
PostPosted: Mon Jul 22, 2019 4:24 am 
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Joined: Tue Jul 01, 2014 8:40 am
Posts: 89
Hi Sheel, Please refer to Article 130.5(H), page 25 of the 2018 edition of 70E. You will find the requirements for the label there. As the both the Limited and Restricted boundaries are not required, the Voltage is required to be listed. We would hope that an educated reader would then be aware or reference what these boundaries are based on the voltage system. Although it may not be a requirement on the label, I do go through extensive explanation of both the Limited and Restricted Approach boundaries in my teachings. As an electrician, I have found as with others that there seems to be an attraction in a busy plant or anywhere really, with an open door on a panel. Everyone gathers, and everyone has a question or comment. This is where the Limited Approach Boundary comes in. I refer to it as an "Electrical Safety Zone" or "Safe Work Area". Not a place for the unauthorized worker. I would suggest that you refer to the definitions of both Limited and Restricted Boundaries in 70E. So in summary, although it is not a requirement on a detailed warning label, workers need to understand what both the Limited and Restricted Approach Boundaries represent.
Hope that this is of some help
Thanks
Len


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 Post subject: Re: Shock Hazard Assesment
PostPosted: Mon Jul 22, 2019 8:25 am 
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Joined: Tue Oct 26, 2010 5:00 pm
Posts: 186
Location: Maple Valley, WA.
We and most of my competitors put the shock boundaries on the label. It is one less thing that the electricians will have to remember if it is stated on the label.

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Robert Fuhr, P.E.; P.Eng.
PowerStudies


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 Post subject: Re: Shock Hazard Assesment
PostPosted: Mon Jul 22, 2019 8:43 am 
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Joined: Tue Jan 19, 2010 2:35 pm
Posts: 132
If your people work with no voltages higher than 480 volts, the voltage boundaries down to 50 volts are the same. That makes it easy to remember. No matter if the voltage is 120, 208, 240, 277 or 480, it's always 12 inches for the restricted approach and 42 inches for the limited approach boundary. Sometimes, we see different voltages in control panels.
Sometimes both 208 and 480 volts in the same cabinet. Generally, the 208 side is fed from the secondary of a local transformer, so the arc flash hazard at the OCD is usually higher than that at the 480 volt source inside the cabinet. Do you put two labels on and expect the person to observe both labels? Often there is not enough space on the cabinet to put two labels. We default to the higher arc flash values found with the 208 volt side and assume the electrician wears at least Class 00 gloves. That class glove is rated to 500 volts. That way, the arc flash value is covered as is the voltage and voltage boundary.


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 Post subject: Re: Shock Hazard Assesment
PostPosted: Tue Aug 06, 2019 10:34 am 
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Joined: Mon Jun 11, 2018 12:02 pm
Posts: 9
Location: Slave Lake, Alberta
We always use RED DANGER - DO NOT CROSS tape to keep unauthorized personnel out of any area where we are opening doors of equipment with any significant hazard potential, especially in electrical or mechanical rooms. Keeps casual traffic out of the way.


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