550.11 Disconnecting Means and Branch-Circuit Protective Equipment
Where plug fuses and fuseholders are used, they shall be tamper-resistant Type S, enclosed in dead-front fuse panel-boards. Electrical panelboards containing circuit breakers shall also be dead-front type.
Informational Note: See 550.20(B) for information on disconnecting means for branch circuits designed to energize heating or air-conditioning equipment, or both, located outside the mobile home, other than room air conditioners.
A panelboard shall be rated not less than 50 amperes and employ a 2-pole circuit breaker rated 40 amperes for a 40-ampere supply cord, or 50 amperes for a 50-ampere supply cord. A panelboard employing a disconnect switch and fuses shall be rated 60 amperes and shall employ a single 2-pole, 60-ampere fuseholder with 40- or 50-ampere main fuses for 40- or 50-ampere supply cords, respectively. The outside of the panel-board shall be plainly marked with the fuse size.
The panelboard shall be located in an accessible location but shall not be located in a bathroom or a clothes closet. A clear working space at least 750 mm (30 in.) wide and 750 mm (30 in.) in front of the panelboard shall be provided. This space shall extend from the floor to the top of the panelboard.
- Not more than the circuit conductors; and
- Not more than 150 percent of the rating of a single appliance rated 13.3 amperes or more that is supplied by an individual branch circuit; but
- Not more than the overcurrent protection size and of the type marked on the air conditioner or other motor-operated appliance.
THIS CONNECTION FOR 120/240-VOLT, 3-POLE, 4-WIRE, 60-HERTZ, _______AMPERE SUPPLY
The correct ampere rating shall be marked in the blank space.
Exception: For manufactured homes, the manufacturer shall provide in its written installation instructions or in the data plate, the minimum ampere rating of the feeder assembly or, where provided, the service-entrance conductors intended for connection to the manufactured home. The rating provided shall not be less than the minimum load calculated in accordance with 550.18.