There is a benefit in reviewing operating procedures and in checking the operation of the standby power even if commercial power does not fail. At a minimum, generators should be exercised at least monthly. Procedures for operation of the standby emergency power equipment should be posted near the power generating equipment. Emergency procedures should be posted nearby and contained in the station duty manual. 4.1 Operation of Uninterruptible Power System .
Power is maintained to the load regardless of the condition of the commercial power source.
The load is protected from instantaneous and subcycle power losses and line disturbances as well as from short-term power outages. 4.2 Response Time for Emergency Service . Review of Agreements . An annual review of any agreement on the cooperative use of standby power or UPS is recommended. The review can disclose shortcomings in the agreement which can be corrected before an emergency occurs which requires the use of emergency power.