This can be a bit tricky. If you have a client, they will often have a list of applicable standards in their specifications. Unfortunately, this is often listed as "all relevant standards to be followed".
Two important standards are AS3000 (or AS/NZ 3000, since we often combine with New Zealand) for wiring rules, and AS4024 Machine Guarding.
AS3000 will have a list of other standards.
Some rules vary according to state, region and industry.
Could you let us know which State and what industry you are targeting? Manufacturing, mining or chemical industry?