Test and tag colours are used for particular industries to represent the different months of the year.
This means that anyone working in construction, mining, marine or demolition are required to follow these particular AS/NZS 3012 guidelines. Anyone else not in those specified industries aren't required to use those electrical tag colours and can instead use colours of their own choice.
State Guide Colours 2021: VIC, NSW, SA, WA and QLD
There’s four colours that are primarily used on a quarterly basis across Australia, which include red, green, blue and yellow test tags (RGBY system). Although NSW previously had a separate colour coding system, this has now aligned with the other states. This now means that VIC, NSW, SA, WA and QLD all have the same electrical test and tag colours.
There’s also other test and tag colours which can be used according to the Standards (orange, white, black, burgundy and grey), but they are not used as frequently. Tagging a portable site office with a yearly test would be an example of where these other colours might be used.
For everyone else not working in those particular industries, you can use any test and tag colours you prefer. The easiest method is to stick to a certain electrical tag colour for the re-testing period and then rotate the colour for all the items next time it’s tested. This will help make it simpler to keep track of which items require testing next time around.