16.—(1) Where necessary in order to ensure the safety of relevant persons in respect of harm caused by fire the person with duties under section 53 or 54 must ensure that the relevant premises and any facilities, equipment and devices provided in respect of the relevant premises under these Regulations or, subject to paragraph (5), under any other enactment, including any enactment repealed or revoked by, under, or by virtue of the 2005 Act, are subject to a suitable system of maintenance and are maintained in an efficient state, in efficient working order and in good repair.
(2) Where the relevant premises form part of a building, the person with duties under section 53 or 54 may make arrangements with the occupier of any premises forming part of the building for the purpose of ensuring that the requirements of paragraph (1) are met.
(3) Paragraph (2) applies even if the other premises are not relevant premises.
(4) Where the occupier of the other premises is not also the owner of those premises, the reference to the occupier in paragraph (2) is taken to be a reference to both the occupier and the owner.
(5) Paragraph (1) only applies to facilities, equipment and devices provided under other enactments where they are provided in connection with fire safety measures.