How does the third umpire work in the Sheffield Shield?

Question

Accepted Answer

Cricket Australia appoints a third umpire from its panel to act as the emergency umpire and to officiate on TV or stream replays in all televised or streamed matches where the third-umpire technology is available.

Run out, stumped, bowled and hit wicket: the on-field umpire may refer the appeal to the third umpire by making the shape of a TV screen with their hands. A red light means out and a green light means not out.
Caught and obstructing the field: the bowler's end umpire first consults the striker's end umpire, then may consult the third umpire by two-way radio. If the third umpire says the replay evidence is inconclusive, the on-field decision communicated at the start of the consultation stands.
Players may not appeal to the on-field umpires to use the Umpire Review. A breach may constitute dissent.

Source: Cricket Australia, 2024-2025 Sheffield Shield and Second XI Playing Conditions, Appendix D.