[RE-wrenches] 690.8

Jerry Shafer jerrysgarage01 at gmail.com
Thu Nov 10 09:46:17 PST 2016


To be clear to all we are protecting each string coming into the combiner
box with a DC rated 15 amp breaker

On Wed, Nov 9, 2016 at 3:57 PM, Jerry Shafer <jerrysgarage01 at gmail.com>
wrote:

> Wrenches
> We are getting some questions from PRMD some questions relating to 690.8
> here is what we have
> 3 modules, 260 watts at 9 amps ISC each module is a single string which
> goes into a MNPV6 disco/combiner/disconnect
> combined to a 30 amp breaker, it is being replaced with a 40 amp per
> 690.8(A) 1
> leaves there and goes to a 32 amp disconnect in our device.
> here is where it gets interesting
> 690.8 (A) requires the 40 amp breaker but reading down to 690.8 (B) 1 we
> need to up-size to 50 amps (no 45 amp is non available)
> We also have added the 63 amp GFI in the disco
> we have also moved up from # 10 wire to # 8 wire as a result
> All this seams over kill for three modules, there are 2 exceptions but
> PRMD do
> not feel they are relative.
> Is the Midnite solar disco considered an assembly with the bus bars inside
> if we install the breakers
> Any ideas would be helpful
> Jerry
>
>
>
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