In this division:
"electrical infrastructure", means—
(a) powerlines and cables; and
(b) substations and equipment for monitoring, distributing, converting, transforming or controlling electricity; and
(c) a structure supporting overhead powerlines and cables; and
(d) wires, ducts or pipes for wires or equipment; and
(e) communication equipment for the management of an electricity network; and
(f) anything else ancillary to paragraphs (a) to (e).
"network boundary" means a boundary between an electricity network and customers' premises worked out under section 53.