This Division does not apply to work carried out--
(a) by or on behalf of an electricity supply authority on the electrical equipment, including electric line-associated equipment, controlled or operated by the authority to generate, transform, transmit or supply electricity, or
(b) by a person accredited to provide contestable services within the meaning of Part 3 of the Electricity Supply (Safety and Network Management) Regulation 2014 , but only while the accredited person is providing the contestable services or carrying out other work authorised by an electricity supply authority.