In respect of a premises, a device installed for the purposes of the Supply of Energy to that premises that, on the date on which it is installed, as a minimum:
(a) consists of the apparatus identified in;
(b) has the functional capability specified by; and
(c) complies with the other requirements of, [Section 5, Part D of the Smart Metering Equipment Technical Specification] that is applicable at that date and was published on or after [SMETS2 date] (or, in the context of a device that has not yet been installed, means a device that is intended to meet the foregoing requirements once it has been installed).