Despite the use of the term national it is not a federal law.
National electrical code branch circuits.
Most local codes are based on the national electrical code nec a document that lays out required practices for all aspects of residential and commercial electrical.
According to nec article 100 a multiwire branch circuit consists of two or more ungrounded conductors that have a voltage between them and a grounded conductor that has equal voltage between it and each ungrounded conductor of the circuit and that is.
The national electrical code nec or nfpa 70 is a regionally adoptable standard for the safe installation of electrical wiring and equipment in the united states it is part of the national fire code series published by the national fire protection association nfpa a private trade association.
National electrical code introduction 5 electrical connections 110 14 d terminal connection torque 6 ground fault circuit interrupter protection for personnel 210 8 preface 7 210 8 for personnel 8 210 8 a dwelling units 9 11 210 8 b other than dwelling units 12 18 210 8 d specific appliances 19.
Electrical codes are in place to protect you the homeowner.