Essential requirements for project subsystems
7.—(1) For the purposes of regulations 4(4), 4(6), 8(3)(a), 10(1) and 27(2) the essential requirements for a project subsystem shall be met by conformity with—
(a)all relevant TSIs (if any); and
(b)where paragraph (2) applies, the requirements of all relevant notified national technical rules (if any).
(2) This paragraph applies to the project subsystem, (insofar as it is not subject to requirements by a relevant TSI), where—
(a)there are no relevant TSIs; or
(b)a relevant TSI does not govern all elements of the project subsystem; or
(c)a derogation from conformity with the whole or part of a relevant TSI has been granted pursuant to regulation 6 in respect of that subsystem; or
(d)the Competent Authority has determined under regulation 5(8) that the whole or part of a relevant TSI does not apply to that subsystem.