[RE-wrenches] Arc Flash Hazards

Kelly Larson solarwrench at asis.com
Thu Mar 25 11:51:29 PDT 2010


Hi Matt,

I recently asked an expert where arc flash would be an issue for PV  
installers.  The answer was: not much threat on DC side, because of  
(relatively) low power, on the AC side, it's the 480V enclosures.

Blessings,
Kelly

Kelly Larson, Electrical Engineer
Box 104
Piercy, CA 95587
707-247-3000
NAPCEP Certified Solar PV Installer
CA C-10 # 868189
SolarKelly at asis.com

On Mar 23, 2010, at 4:36 PM, Matt Lafferty wrote:

> Wrenches,
>
> You know solar is prime-time when it hits the mainstream "What's  
> wrong with this picture" quiz! http://ecmweb.com/nec/whats_wrong_here/whats_wrong_020410/
>
> How are you dealing with NEC 110.16?
>
> 2008 NEC 110.16 Flash Protection.
> Electrical equipment, such as switchboards, panelboards, industrial  
> control panels, meter socket enclosures, and motor control centers,  
> that are in other than dwelling occupancies, and are likely to  
> require examination, adjustment, servicing, or maintenance while  
> energized shall be field marked to warn qualified persons of  
> potential electric arc flash hazards. The marking shall be located  
> so as to be clearly visible to qualified persons before examination,  
> adjustment, servicing, or maintenance of the equipment.
>
> I'm seeing all flavors out there. Including the most common,  
> pretending it doesn't exist. Back in the day, relying on Qualified  
> Persons Only and Danger! High Voltage! You Can Die If You Touch It  
> (or similar) was enough. Are you finding building inspectors that  
> are requiring the specific Arc Flash Hazard signage? In addition to,  
> or in lieu of, other signage?
>
> Separate, but related issue: Now that OSHA and NFPA 70e are dancing  
> to the same song, has this affected your operations? If so, in what  
> way?
>
> Keep it Safe and Sunny!
>
> -Matt Lafferty
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Kelly Larson, Electrical Engineer
Box 104
Piercy, CA 95587
707-247-3000
NAPCEP Certified Solar PV Installer
CA C-10 # 868189
SolarKelly at asis.com





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