Hi All,
The roof top level electrical room has a 800A bus duct protected by a 600A breaker in the basement electrical room and we have 120A total output current from all inverters. Per 2017 NEC 705.12 (B)(2)(3)(a) 1.25x120+600<800A so we should be able to do load side connection on bus duct. However, I have 2 questions: (1). Does plug-in unit on the bus duct have OCPD? The rooftop level electrical room is very tight in terms of space so I couldn't install any fused disconnect there with proper working space clearance. (2) Is the plug-in unit good for backfeed? here is the nameplate of the bus duct below.
The roof top level electrical room has a 800A bus duct protected by a 600A breaker in the basement electrical room and we have 120A total output current from all inverters. Per 2017 NEC 705.12 (B)(2)(3)(a) 1.25x120+600<800A so we should be able to do load side connection on bus duct. However, I have 2 questions: (1). Does plug-in unit on the bus duct have OCPD? The rooftop level electrical room is very tight in terms of space so I couldn't install any fused disconnect there with proper working space clearance. (2) Is the plug-in unit good for backfeed? here is the nameplate of the bus duct below.
