Mike Dolt Enterprises
Mike Dolt Enterprises
User: TaraPersaud, Location: Tennessee
Asked on: Friday, March 18, 2011 at 12:36 pm EDT
Answered on: Tuesday, May 14, 2024 at 2:59 am EDT
Question: HiI have a SE rated 400 A ATS that I am installing. This will connect to the Utility and the Generator eliminating the need for any other disconnect. I have a question though. On the load side of the ATS do I connect a Panelboard with a Main Breaker or can I do so with only a Main Lug panelboard only?
You can connect either a panelboard with a main breaker or a main lug panelboard to the load side of the ATS.
Panelboard with a Main Breaker
Provides additional protection and isolation from the load side. Main breaker can be tripped to isolate the entire load. May require additional space in the panelboard.
Main Lug Panelboard
More compact and cost-effective. Main lugs provide a solid connection for multiple conductors. Requires separate overcurrent protection devices (OCPDs) to be installed on each circuit.
Recommendation
In this case, since the ATS is rated for 400 A and you have a large load, it is recommended to use a
panelboard with a main breaker. This will provide additional safety and protection for the load.Ensure that the main breaker in the panelboard is sized appropriately for the load and that the ATS is properly configured to supply the correct voltage and current to the load. Flag for review