Which document, along with the NEC®, requires field markings on switchboards and panelboards for arc flash hazards?

The correct answer is NFPA 70E, which is the National Fire Protection Association's standard for electrical safety in the workplace. This document specifically addresses arc flash hazards and establishes requirements for safety-related work practices, including the necessity for proper labeling and field markings on switchboards and panelboards.

NFPA 70E outlines the framework to ensure that employees are informed of potential arc flash risks and can take necessary precautions. The requirement for labeling helps ensure that individuals working on or near electrical equipment are aware of the potential dangers, including the need for personal protective equipment (PPE) appropriate to the calculated arc flash hazard.

In contrast, other options either pertain to different areas of electrical or safety standards or do not focus specifically on the requirements for arc flash hazard markings. ASHRAE deals with HVAC standards, IEE centers on electrical engineering practices (mainly outside the U.S.), and OSHA addresses workplace safety regulations but does not specifically mandate the same detailed labeling requirements related to arc flash hazards as NFPA 70E.