American Power Conversion 250 A - Manual (Page 13)

Warnings
InfraStruXure Power Generation System 3
Installation
Install the ATS in accordance with the National Electrical Code (NFPA 75) in the United States, or in
accordance with the Canadian Electrical Code (CSA C22.1-02) in Canada.
When connecting Source 1 power to the ATS, install an external circuit breaker to protect against
over-current conditions. The external circuit breaker must be rated at 250 A, with a symmetrical
ampere rating of 35,000 rms.
Total power off procedure
To reduce the risk of electric shock or injury to personnel, disconnect all sources of power supply
before servicing. To disconnect all sources of supply, follow this procedure:
1. Set the Automatic Operation