What document outlines the safety standards for escalators in the U.S.?

The document that outlines the safety standards for escalators in the U.S. is ASME A17.1. This standard is a key guideline developed by the American Society of Mechanical Engineers, specifically focusing on the safety aspects of escalators and moving walks. It includes provisions for the design, construction, operation, inspection, testing, maintenance, and modernization of escalators, ensuring that they are safe for public use.

ASME A17.1 plays a critical role in maintaining high safety standards in the industry, as it is widely adopted by various jurisdictions across the United States. Understanding this standard is essential for anyone involved in the installation and inspection of escalator systems, as compliance with these safety guidelines is crucial to prevent accidents and ensure the reliability of escalators in public environments.

The other documents mentioned serve different purposes: ISO 9001 is focused on quality management systems, ANSI Z535 addresses safety signs and colors, and NEC 70 relates to electrical codes. These do not specifically address escalator safety, which underscores why ASME A17.1 is the correct answer.