Bonding of electrical equipment [RE-wrenches]

[Mark Frye]

see NEC 2005 250.97  w/ Exception.

circuits over 250V,, the conduit has to have bonding bushing or similar 
if it is installed in a concentric ko (unless enclosure and ko 
specifically listed). if you are not going through any concentric, 
eccentric or oversized ko's, your AJH is making up his own rules
perhaps egged on by those that believe that the PV AC ouptuts should be 
treated as new serrvice enterance equipment

p.s.  plactic bushing is required for cut nipples but not for other 
listed fittings that provide for protection of the conductors.  Most 
folks go goo goo over the plastic bushing and it may be a good idea but 
most listed connectors do not actually require the bushing


Keith Cronin wrote:
> 
> 
> Hi gents
> 
>  
> 
> A topic came up today that I wanted to run by the team, electrically
> speaking- NEC. An electrical inspector had a viewpoint that all conduit 
> runs
> from a main distribution system to our equipment- i.e.- disconnects and 
> any
> inverters or junction boxes needed to have bonding bushings as opposed 
> to
> standard locknuts with plastic bushings. These systems are grounded with 
> the
> appropriate grounding wiring sized per the NEC for the feeders. I have 
> not
> seen this requirement before and wanted to see what you all have 
> experienced
> in this environment.
> 
>  
> 
> One perspective was that if the enclosure has concentric knockouts, like 
> a
> junction box or distribution panel, then yes, they would be required and 
> if
> it is over 300 volts, then they would be required.
> 
>  
> 
> Looking forward to some feedback.
> 
>  
> 
> Thanks
> 
>  
> 
> Keith
> 
>  
> 
> 
> [Non-text portions of this message have been removed]
> 



Berkeley Solar Electric Systems


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