Server entrance

[kfenn22]

The incoming feed from the utility transformer to the building. can you have an ATS up stream of the MDP(Service Disconnect), or do I need to have a disconnect switch upstream of the ATS.

 

[Buck Parrish]

IMO, You need a disconnect before the ATS.

 

[kfenn22]

Thanks, that is what I thought...

 

[TOOL_5150]

IMO, You need a disconnect before the ATS.

This is true, unless the ATS is rated as service equipment.

~Matt

 

[enteng14]

We don't only provide a service disconnect before the ATS, but we really specify that it is a service equipment (disconnect and overcurrent protective device). We really state that it is a service equipment because some practitioner misinterpret the service disconnect from service equipment.

TOOL51_50 is right that when the ATS is suitable as service equipment, then no additional service equipment is needed before the ATS. Just bond your grounded service conductor on the ATS main bonding terminal together with your grounding eletrode conductor and equipment grounding conductor.