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 Post subject: How far down to go with the Study
PostPosted: Tue Aug 11, 2009 5:50 am 
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Hello,
For our facility we performed all of our 480 and most of our 230 V panels. How far do we need to take? Should we do all the panels even though we know some of them are 120 V ?


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PostPosted: Tue Aug 11, 2009 6:43 am 
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Location: Charlotte, NC
ndecks wrote:
Hello,
For our facility we performed all of our 480 and most of our 230 V panels. How far do we need to take? Should we do all the panels even though we know some of them are 120 V ?


Most use the IEEE 1584 referenced <240V supplied by a transformer <125kVA as the cutoff point for the study and apply the tables below that point.


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PostPosted: Tue Aug 11, 2009 7:19 am 
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Thanks for the reply Zog.
Do you have a link to the tables?


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PostPosted: Tue Aug 11, 2009 8:14 am 
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ndecks wrote:
Thanks for the reply Zog.
Do you have a link to the tables?


Nope, you need to get a copy of the 2009 NFPA70E. How in the world are you doing any type of arc flash analysis without one?


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PostPosted: Wed Aug 12, 2009 6:30 am 
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[url="http://www.nfpa.org/freecodes/free_access_agreement.asp?id=70E09"]http://www.nfpa.org/freecodes/free_access_agreement.asp?id=70E09[/url]


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PostPosted: Mon Aug 17, 2009 11:13 am 
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Not trying to hi-jack the thread so hope this not to far out.

So do you label the lower voltage panels with the information from the tables?

Trying to keep it simple so that when they approach a panel it is clear what PEE is required for the panel.


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PostPosted: Mon Aug 17, 2009 11:14 am 
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Not trying to hi-jack the thread so hope this not to far out.

So do you label the lower voltage panels with the information from the tables?

Trying to keep our system simple so that when they approach a panel it is clear what PEE is required for the panel.


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PostPosted: Wed Aug 19, 2009 8:52 am 
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Location: Lawrenceburg KY
Go all the way.

During my work I make sure the circuit panels 208/120 fed by a transformer <125 kva is labeled with the same type arc flash label as other equipment to maintain uniformity. However, in the arc flash section of the label I reference NFPA 70E arc flash study exception. No AF PPE or CAT #0 protection depending on your program. The label should state the voltages present at the panel board and name of the upstream protective device. Voltages >50v require shock protection. I label this with the <300v PPE. See NFPA 70E table for boundaries & gloves. I also make sure a panel schedule exist as to what each breaker controls. Now you should meet NEC/NFPA 70E standards.


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