Per Informative Appendix J in the NEC, specific receptacle and switch box mounting heights are required by the ?

• A. National Electrical Code (NEC)
• B. Americans with Disabilities Act Guidelines (ADA)
• C. Occupational Safety and Health Administration (OSHA)
• D. Building Code Standards

Answer: (B)

Accessibility of electrical installations is the focus here, specifically ensuring receptacles and switch boxes are mounted at heights usable by people with disabilities. Informative Appendix J in the NEC points to the ADA Guidelines as the source for these accessible mounting requirements, so the heights are determined to meet accessibility needs rather than purely electrical safety concerns. In practice, that means the reachability and operability of outlets and switches follow ADA provisions, not general NEC safety rules or other standards. The NEC itself governs electrical design and safety, but the specific mounting heights for accessibility come from ADA guidelines, which is why this is the best fit.