2023 Caterpillar D400GC, Generator Sets, In Stock. Units Must be Used in Standby application as seen below. Failure to do so will void Cat warranty and End User/Reseller will be responsible for federal fines/penalty. EPA Stationary Tier 2 (500 hrs or less per year or the duration of the utility outage for emergency purposes only). EPA Stationary Tier 2 (500 hrs or less per year or the duration of the utility outage for emergency purposes only). C13 400kw ,