Maximum breaker size for DB (solar PV)

[Stengs]

Hi,

Can anyone point me in the direction of the regulation / code for the max solar MCB size when connecting into a spare way of a local distribution board ?

Eg. Is it possible to connect a 100A breaker into a 100A board ?

 

[LankyWill]

Need more clarification, your question sort of answers itself.

 

[Stengs]

I remember reading about the "20% rule" where pv breakers are limited to 20% of the array current on the load side, which doesn't seem right to me.

Say I have a 100A DB which has 80A connected load, one spare way. My PV mcb has to be 80A. Can I connect this safely as long as I'm below the 100A rating for the DB? Just can't find this in writing anywhere in the yellow book!