Switchboards and Panelboards
408.4 Circuit Directory or Circuit Identification
Part I. General
This section on circuit identification was rewritten to improve safety by ensuring that workers don't have to guess which breaker operates what circuit.
All circuits and circuit modifications must be legibly identified as to their clear, evident, and specific purpose. The identification must include sufficient detail to allow each circuit to be distinguished from all others, and the identification must be on a circuit directory located on the face or inside of the door of a panelboard. See 110.22. Figure 408-1
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