Specifications

2 Automatic Transfer Switch with Power Distribution
Warnings
The components in the InfraStruXure Power Generation System and UPS power distribution system
can pose life-threatening danger when improperly installed, operated, or maintained. To prevent
accidents, be aware of the dangers and act safely. Read and follow all of the safety instructions and
warnings in this manual and in all of your component manuals.
The InfraStruXure Power Generation System is an Optional Standby System
The generator and Automatic Transfer Switch (ATS) that you purchased from APC is classified as an
Optional Standby System—it provides backup or standby power to data centers in the event of a
sustained power failure.
The InfraStruXure Power Generation System is not to be classified as an Emergency System that is
essential for safety to human life (e.g., fire pumps, operating room, and life-support equipment in
hospitals) as legally required by a municipal state, federal, or other governmental codes.
The InfraStruXure Power Generation System is not to be classified as a Legally-Required Standby
System as it is not supplying power to aid in fire fighting, rescue operations, control of health hazards
(e.g., sewage) and similar operations as required by a municipal, state, federal, or other governmental
codes.
Emergency and Legally-Required Systems are not allowed to rely on municipal fuel for operation and
municipal water for cooling. Emergency and Legally-Required Systems require dual fuel systems,
with one of them being a two-hour, on-site fuel supply.
Your InfraStruXure Power Generation System is not to be classified as an Integrated Electrical
System as an orderly shutdown is not required to prevent damage to the generator. The generator is
not to be paralleled with another generator.
Your generator will operate at its rated load without being re-fueled for a minimum of six hours, and
should run for a minimum of 12 hours.
Your generator can be without electrical power to the load terminals of the transfer switch for 60
seconds maximum, but will typically be without power for no more than 10 seconds.
Wire sizing
This product and this manual were designed for the 250-amp ATS. All wiring recommendations were
sized for this amperage in accordance with the United States National Electric Code (NEC). This
does not prevent you from using the ATS at a lower current with smaller wire sizes. If you decide to
operate this ATS at a lower current, ensure that the wire sizes are in accordance with the NEC and
local codes.