What is NOT a requirement of equipment criteria for gas machines?

The choice indicating that a standard lighting system is not a requirement of equipment criteria for gas machines is correct because equipment used in podiatry, specifically those involving gas for anesthesia or surgery, has specific functional and safety standards focused primarily on the operation and monitoring of gases.

Gas machines must be equipped to ensure safety and efficacy, which includes components like glass tubes for visibility of gas flow, a fail-safe mechanism to prevent malfunctions, and systems ensuring that no gas can flow without the presence of adequate oxygen. These elements are critical for patient safety during procedures that involve sedation or anesthesia.

While proper lighting is important for a variety of medical procedures, it is not a specified requirement within the context of the gas machine equipment criteria. Therefore, it stands out as an element that, while beneficial, does not directly relate to the essential operational safety and monitoring of the gas delivery system in podiatry practices.