NFPA
NFPA 70 is the National Electrical Code, published by the National Fire Protection Association. It is the widely adopted installation standard for electrical wiring and equipment in the United States, written to protect people and property from electrical hazards, and it is revised on a regular cycle.
Editions cited: NFPA 70
The code concerns how electrical systems are installed, not how equipment is designed or tested. It addresses wiring methods and materials, overcurrent protection, grounding and bonding, equipment for general and special occupancies, and the particular rules for capacitors and other equipment that store or condition energy. State and local authorities adopt it, usually with their own amendments, so it becomes the legal baseline that electrical designers, contractors and inspectors work to. Testing engineers meet it whenever a test result has to be tied to an installation requirement. In this encyclopedia it is cited for capacitor installations, though its reach across electrical installations is far wider. The locally adopted edition governs. This page describes the document in original words and does not reproduce it. For the rules and tables, obtain a licensed or reference copy of NFPA 70 from the publisher.