11.125.250 Power supply reliability.
(a) If power failure would result in cessation of minimum essential service, power supply reliability shall be assured by either a second reliable power feed from the power company or by the installation of an on-site standby generator. Whether minimum essential service can be maintained in the area served by the pumping station during the length of time normally associated with power outages from other sources would depend on system interconnections, available storage, etc. These factors shall be analyzed to determine if standby power is essential.
(b) Dual Feeders. For dual feeders from the power company, the following criteria shall apply:
(1) The two feeders shall be from nonadjacent bays at the power company’s substation. The two feeders shall follow separate routes so that chances of simultaneous disruption of power will be minimized.
(2) The feasibility, reliability, and cost of a second feed shall be carefully evaluated and compared with the cost of on-site generation and the better alternate shall be chosen with the concurrence of WSSC. (28-ME-DG-02 § 21.2)