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In this video I will explain what is considered a Separately Derived System in regards to Generators. Also what type of ATS Switches you need to install with the Separately Derived Generator. I show you most of the inside of the Generator Enclosure that was prefabricated by a 3rd party contractor. We wired the load side of all the Disconnects which was a total of 6, Emergency, Legally Required Systems, Optional Standby Systems, and 2 fire pump Disconnects (one for the retail tenant and one for the main building). Lastly, the Fire Alarm disconnect. There is a 7th Disconnect that came wired already which was for the Load Bank. The Optional Standby Systems will be load shed in the case of an emergency when the either of the Fire pumps are activated the shunt trip on the Optional Standby will trip and will shut down all those loads. Please send me any comments should you have any questions regarding this video or any other topic.
NEC Code Reference: 250.30 (A) & Informational Note 1
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