By any measure, NFPA 70E is an electrical safety document, but how can a maintenance standard be related to safety? NFPA 70E specifically calls out two maintenance-related standards, as well as having a chapter on safety-related maintenance requirements (Chapter 2). Those two standards are the NFPA 70B, Recommended Practice for Electrical Equipment Maintenance and ANSI/NETA Standard for Maintenance Testing Specifications for Electrical Power Distribution Equipment and Systems or MTS-2011. (See Figures 1a and 1b.)