New South Wales Consolidated RegulationsA person must not carry out any kind of gasfitting work, or employ any other person to carry out any kind of gasfitting work, unless the person by whom the work is carried out does so:
(a) under the authority of an appropriate supervisor certificate, or
(b) under the authority of an appropriate tradesperson certificate and under the general supervision of the holder of an appropriate supervisor certificate, or
(c) under the immediate supervision of the holder of an appropriate supervisor certificate.
Maximum penalty: 100 penalty units (in the case of a corporation) or 25 penalty units (in any other case).