46 C.F.R. § 111.40-11 Numbered switching unit and panelboard directory.
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(a) Each panelboard switching unit must be numbered. (b) Each panelboard must have: (1) A circuit directory cardholder; and (2) A circuit directory that has: (i) The circuit designation of each circuit; (ii) A description of the load of each circuit; and (iii) The rating or setting of the overcurrent protective device for each circuit.
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PART 111—ELECTRIC SYSTEMS—GENERAL REQUIREMENTS
Subpart 111.40—Panelboards
§ 111.40-11 Numbered switching unit and panelboard directory.

