What safety standard covers confined spaces?

The correct answer is ANSI Z117.7, which specifically addresses safety requirements for confined spaces. This standard provides guidelines to ensure that workers entering confined spaces are protected from potential hazards such as lack of oxygen, toxic atmospheres, and physical hazards. It outlines the necessary practices for safe entry, working, and exiting, as well as procedures for evaluation and risk management.

The other options focus on different aspects of safety and health regulations. OSHA 1926 relates to construction standards and includes various safety protocols for construction sites but does not specifically target confined spaces. ISO 45001 is an international standard for occupational health and safety management systems aiming to improve safety, but again, it does not focus specifically on confined space safety. ANSI Z535 deals with safety colors and signs to communicate hazards effectively but does not cover the procedural aspects of working in confined spaces. Thus, ANSI Z117.7 is the most appropriate safety standard for the specific context of confined space work.