Section 111.40-11 - Numbered switching unit and panelboard directory(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.