(1) Where delivery and service (as distinguished from transmission) are carried out through the systems of others and by the personnel of others, the total electric power and energy, including reactive power and energy where authority deems appropriate, transmitted or delivered to a customer (as distinguished from transmitted over the facilities of others) will be measured by metering equipment and measuring devices to be furnished and maintained by either authority or the utility providing delivery and service. Seals on meters, meter equipment and associated equipment shall be broken only upon occasions when the meters and measuring devices are to be inspected, tested, or adjusted. No person, except a duly authorized and identified representative of authority or the utility providing delivery and service, shall be permitted to break or replace a seal or to alter or change a meter of its connections or location, except when wiring changes are being made by customer following receipt of appropriate specifications of authority or the utility providing delivery and service as to service supply. In such case, a qualified electrician may break the meter seal and remove and remount a meter when authorized to do so by authority and/or by the utility providing delivery and service, whichever seals such meter. Meters owned by the authority or the utility providing delivery and service shall be tested by authority or such utility providing delivery and service as mutually determined by them.

(2) Should any meter fail to register for any period of time, or if the actual power and energy usage cannot be measured because of inability to read a meter or other measuring device, the electric power and energy delivered during such period shall, for billing purposes, be estimated by authority from the best information available, and customer billed accordingly.

(3) Except as provided in this section, customer shall not permit access by anyone, except authorized representatives of authority or the utility providing delivery and service, to the meter equipment or any other property of authority or the utility providing delivery and service, and shall not interfere or permit interference with such equipment. Customer shall be responsible for their safekeeping on his premises. Duly authorized representatives of authority and the utility providing delivery and service shall have the right to access to the premises of customer and to all appropriate property of authority or the utility providing delivery and service to all reasonable times for the purpose of reading and testing meters, inspecting equipment used in connection with its service, repairing, readjusting, or replacing defective or inaccurate meters, metering the demand, ascertaining and counting the connected load of customer's installation, removing its property, or any other purpose.