This discussion is locked.
You cannot post a reply to this discussion. If you have a question start a new discussion

What's IMOD_MAX_OCPR ?

I've been trying to make some sense of the newly re-written section 712 (PV) - but I'm struggling with a few things - firstly can anyone tell me what "IMOD_MAX_OCPR" represents? (e.g. in regs 712.431.101 and 102). Unlike most one-off symbols (like Np) it's not explained below, nor can I find it on page 46 (Symbols used in BS 7671). It seems to be something to do with an overcurrent protective device, but seemingly not it's nominal rating, since part of the requirement is that  In ≤  IMOD_MAX_OCPR, nor I guess breaking capacity since 1.35 IMOD_MAX_OCPR ≤ (Ns -1) ISC MAX.

   - Andy.

Parents
  • AFAIK, max OCPR=maximum over current protection rating.

    A single PV module, or a single series string of PV modules does not in practice need a fuse, though some regulations may require it.

    The short circuit current is only slightly greater than the normal load current. No fuse can reliably handle to full load current but reliably operate on the short circuit current.

    If however a number of PV modules, or a number of series strings of PV modules are paralleled, then fuses are required to allow for a faulty module or series string of modules DRAWING current from the sound modules and perhaps starting a fire.

Reply
  • AFAIK, max OCPR=maximum over current protection rating.

    A single PV module, or a single series string of PV modules does not in practice need a fuse, though some regulations may require it.

    The short circuit current is only slightly greater than the normal load current. No fuse can reliably handle to full load current but reliably operate on the short circuit current.

    If however a number of PV modules, or a number of series strings of PV modules are paralleled, then fuses are required to allow for a faulty module or series string of modules DRAWING current from the sound modules and perhaps starting a fire.

Children
No Data