10.—(1) Subject to paragraph (2), and without prejudice to any other requirement as to earthing, a generator, distributor or meter operator shall ensure that any metalwork enclosing, supporting or otherwise associated with their equipment in a network and which is not intended to serve as a phase conductor is, where necessary to prevent danger, connected with earth.
(2) Paragraph (1) shall not apply—
(a)to any metalwork attached to, or forming part of, a wooden pole support, the design and construction of which is such as to prevent, so far as is reasonably practicable, danger within 3 metres of the ground from any failure of insulation or failure of insulators; or
(b)to any wall-mounted metal bracket carrying an overhead line not connected with earth, where the line is both supported by an insulator and the part of the line in contact with the insulator is itself surrounded by insulation.