Switchboards and distribution systems

46 CFR §111.05-37

§ 111.05-37 -37 Overcurrent devices. (a) A permanently grounded conductor must not have an overcurrent device unless the overcurrent device simultaneously opens each ungrounded conductor of the circuit. (b) The neutral conductor of the emergency-main switchboard bus-tie must not have a switch or circuit breaker. [CGD 94-108, 61 FR 28276, June 4, 1996]

46 CFR §111.30-29

§ 111.30-29 -29 Emergency switchboards. (a) Each emergency generator must have an emergency switchboard. (b) There must be a test switch at the emergency switchboard to simulate a failure of the normal power source and cause the emergency loads to be supplied from the emergency power source. (c) The emergency switchboard must be as near as practicable to the emergency power source but not in the same space as a battery emergency power source. (d) Each switchboard of an alternating-current emergency generator must have: (1) A circuit breaker that meets § 111.12-11; (2) A disconnect switch or link for each emergency generator conductor, except for a switchboard with a draw out or plug-in type generator circuit breaker that disconnects: (i) Each generator conductor; and (ii) If there …

46 CFR §111.40-11

§ 111.40-11 -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.

46 CFR §112.05-3

§ 112.05-3 -3 Main-emergency bus-tie. Each bus-tie between a main switchboard and an emergency switchboard must: (a) Disconnect automatically upon loss of potential at the emergency switchboard; (b) Be arranged to prevent parallel operation of an emergency power source with any other source of electric power, except for interlock systems for momentary transfer of loads; and (c) If arranged for feedback operation, open automatically upon overload of the emergency power source before the emergency power source is tripped off the line from the overload.

46 CFR §112.43-1

§ 112.43-1 -1 Switches. An emergency lighting system must not have a switch, except: (a) In a distribution panel; (b) As required in § 112.43-7; or (c) In a circuit that serves a hazardous space such as a paint room or cargo handling room if the switch is located outside of the hazardous location. [CGD 74-125A, 47 FR 15267, Apr. 8, 1982, as amended by CGD 94-108, 61 FR 28287, June 4, 1996]

46 CFR §183.330

Distribution panels and switchboards. (a) Each distribution panel and switchboard must be in as dry a location as practicable, adequately ventilated, and protected from falling debris and dripping or splashing water. (b) Each distribution panel or switchboard must be totally enclosed and of the dead front type. (c) Each switchboard must be fitted with a dripshield. (d) Distribution panels and switchboards that are accessible from the rear must be constructed to prevent a person from accidentally contacting energized parts. (e) Working space must be provided around all main distribution panels and switchboards of at least 610 millimeters (24 inches) in front of the switchboard, and at least 455 millimeters (18 inches) behind the switchboard. Rear access is prohibited when the working s…