[RE-wrenches] NEC 705.12 Point of Connection - 120% rule for center-fed panelboards

[William Miller]

August:

Our AHJs are correctly treating the top or bottom most breaker positions as "the opposite end." 

As you examine the problem you realize the only scenario in which currents add is if load breakers are NOT between the main and PV feeders. Locating PV feeders at either end of the bus accomplishes the goal of preventing additive currents. 

If it would help I could find a submittal check list on jurisdiction letter-head stipulating this allowance. 

William

> On Mar 2, 2016, at 8:32 AM, August Goers <august at luminalt.com> wrote:
> 
> All –
>  
> We are seeing more AHJs not allowing us to use the NEC 7015.12(D)(2)(3)(b) 120% rule on center-fed panelboards. For example, if we have a 100 A meter/main combo with a center fed 100 A breaker we cannot apply the 120% rule at all and need to do a panel swap. What are other wrenches doing in this case?
>  
> Best,
>  
> August
> Luminalt
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