.10 Maintenance, Inspection, and Tests.

A. Each utility shall adopt a program of periodic tests, inspections, and other preventive maintenance activity to provide safe, adequate, and reliable service.

B. Each utility shall maintain or have access to test facilities enabling it to determine the operating and transmission capabilities of all equipment and facilities, both for routine maintenance and for fault location.

C. Each utility shall maintain or have access to the necessary facilities, instruments, and equipment for testing its metering and recording equipment and shall adopt appropriate practices for the periodic testing of its operation.

D. Each utility shall test any usage recording devices upon written request of any customer, based upon reasonable grounds and provided the test is not requested more frequently than once each 12 months without clear cause.