ggunn
PE (Electrical), NABCEP certified
- Location
- Austin, TX, USA
- Occupation
- Consulting Electrical Engineer - Photovoltaic Systems
I have been designing commercial and residential PV systems for 15 years, but this is a new wrinkle for me.
A client has asked me to review a design for a PV system interconnection through a 600A fused disconnect with 500A fuses tapped onto the busbars of a 4000A MDP. The conductors between the tap and the fused disco are two sets of 300kcmil copper. All this stuff is outdoors and the design calls for the disco to be within 10' of the MDP.
705.12(B)(2) specifically talks about connection through a backfed breaker, so I don't think it applies. 705.12(B)(5) may apply, but I don't know yet if the MDP busbars already "supply lugs" (supply is a verb in this context, I believe) or if they plan to add them, in which case does the article apply?
I have never done an interconnection this way, and it looks a bit weird to me. Whaddya think?
A client has asked me to review a design for a PV system interconnection through a 600A fused disconnect with 500A fuses tapped onto the busbars of a 4000A MDP. The conductors between the tap and the fused disco are two sets of 300kcmil copper. All this stuff is outdoors and the design calls for the disco to be within 10' of the MDP.
705.12(B)(2) specifically talks about connection through a backfed breaker, so I don't think it applies. 705.12(B)(5) may apply, but I don't know yet if the MDP busbars already "supply lugs" (supply is a verb in this context, I believe) or if they plan to add them, in which case does the article apply?
I have never done an interconnection this way, and it looks a bit weird to me. Whaddya think?