Hi,
I recently encountered a type II EES system with an essential system demand load of less than 150 kVA. The system has two ATSs. One ATS splits the essential loads into 2 branches (permitted if under 150 kVA), and the other ATS is standby power for non-essential loads. The generator is sized such that it can carry the all loads.
Question is if the generation for the essential system load needs to be separate from the stand-by loads. Also, is there any restriction to oversizing the generator? Seems oversizing would be ideal from a selective coordination perspective.
I recently encountered a type II EES system with an essential system demand load of less than 150 kVA. The system has two ATSs. One ATS splits the essential loads into 2 branches (permitted if under 150 kVA), and the other ATS is standby power for non-essential loads. The generator is sized such that it can carry the all loads.
Question is if the generation for the essential system load needs to be separate from the stand-by loads. Also, is there any restriction to oversizing the generator? Seems oversizing would be ideal from a selective coordination perspective.