Onshore it is likely that AS/NZS 3000 will apply, often together with other industry-specific standards such as the AS/NZS 3007 series. Even if the legislation that applies allows some freedom for the facility owner to nominate different standards to control electrical risk, it is rare that that will do so. Australian electrical workers are familiar with AS/NZS 3000, so nominating some other standard is likely to create confusion and cause problems.
Offshore it’s a whole different ball of wax. Firstly, the legislation allows freedom for facility owners to nominate any standards that they deem appropriate to control the risk. The operator is required to submit a “safety case” for the facility, which includes the standards to which it will be constructed, operated and maintained. Secondly, the facility may be “classed” which means that the standards nominated by the marine class society (Lloyds, DNV, ABS) will apply. The upshot of all this is that it is less likely for AS/NZS 3000 to apply to the installation. However, it is still quite likely that AS/NZS/IEC 60079.14 will apply to the hazardous area installation. This is either because the standards will be called up in the safety case, or because it is nominated by the class society.