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Discuss Maximum breaker size for DB (solar PV) in the Electrical Wiring, Theories and Regulations area at ElectrciansForums.co.uk.

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  1. Stengs
    Offline

    Stengs New EF Member

    Location:
    Glasgow
    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 ?
     
  2. LankyWill
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    LankyWill Electrician's Arms

    Location:
    Northants
    Need more clarification, your question sort of answers itself.
     
  3. Stengs
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    Stengs New EF Member

    Location:
    Glasgow
    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!
     
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