Each panelboard must meet Section 9.10.1 of IEEE 45.1-2017 (incorporated by reference; see § 110.10-1 of this subchapter).

Each panelboard must have a noncombustible enclosure that meets §§ 111.01-7 and 111.01-9.

Each panelboard must be accessible but not in a bunker or a cargo hold, except a cargo hold on a roll-on/roll-off vessel.

The door of each panelboard enclosure that is accessible to any passenger must have a locking device.

(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.

Each panelboard must have a current rating not less than the feeder circuit capacity.

The total load on any overcurrent device located in a panelboard must not exceed 80 percent of its rating if, in normal operation, the load will continue for 3 hours or more; except if the assembly, including the overcurrent device, is rated for continuous duty at 100% of its rating.