Which standard governs safety in confined spaces?

The correct answer is ANSI Z117.7, which specifically addresses the safety requirements for working in confined spaces. This standard provides guidelines that ensure the health and safety of personnel who may be required to enter or work in confined spaces, which can pose numerous hazards due to their limited access and potential for dangerous atmospheres. It covers aspects such as the identification of hazards, procedures for entering and exiting these spaces, and the necessary training for workers.

While OSHA 1926.651 pertains to safety in construction operations and includes guidelines regarding confined spaces, ANSI Z117.7 is more specific to confined space safety, making it the standard that directly governs these situations. The other standards mentioned, such as IEEE 802.3, which relates to networking and telecommunications, and NFPA 704, which pertains to the labeling of hazardous materials, do not address confined space safety and are therefore not applicable in this context.