If, in the case where machinery on or in the premises in question is used solely for the distribution of electricity - (a) the maximum demand over any continuous period of 30 minutes is 3 000 kVA or less, the person designated in terms of sub regulation (1) shall be a person as referred to in paragraph (a) of the definition of 'competent person' and registered as an installation electrician in terms of regulation 11(1) of the Electrical Installation Regulations, promulgated under Government Notice R2270 of 11 October 1985; (b) any such demand exceeds 3 000 kVA, but is less than 10 000 kVA, the employee so designated shall be a person as referred to in paragraph (b), (c) or (d) of the said definition; (c) any such demand is 10 000 kVA or more, the employee so designated shall be a person as referred to in paragraphs (c) or (d) of the said definition.