place by an addi- tional fastener that requires other than a pull to release the device from the mounting means on the panel.
408.37 Panelboards in Damp or Wet Locations.
Panel-boards in damp or wet locations shall be installed to comply with 312.2.
408.38 Enclosure. Panelboards shall be mounted in cabinets, cutout boxes, or enclosures designed for the purpose and shall be dead-front.
Exception: Panelboards other than of the dead- front, externally operable type shall be permitted where accessible only to qualified persons.
408.39 Relative Arrangement of Switches and Fuses. In panelboards, fuses of any type shall be installed on the load side of any switches.
Exception: Fuses installed as part of service equipment in accordance with the provisions of
230.94 shall be permitted on the line side of the service switch.
408.40 Grounding of Panelboards. Panelboard cabinets and panelboard frames, if of metal, shall be in physical contact with each other and shall be connected to an equip ment grounding conductor. Where the panelboard is used with nonmetallic raceway or cable or where separate equipment grounding conductors are provided, a terminal bar for the equipment grounding conductors shall be secured inside the cabinet. The terminal bar shall be bonded to the cabinet and panelboard frame, if of metal; otherwise it shall be connected to the equipment grounding conductor that is run with the conductors feeding the panelboard.
Exception: Where an isolated equipment grounding conductor is provided as permitted by 250.146(D), the insulated equipment grounding conductor that is run with the circuit conductors shall be permitted to pass through the panelboard without being connected to the panelboards equipment grounding terminal bar.
Equipment grounding conductors shall not be connected to a terminal bar provided for grounded conductors or neutral conductors unless the bar is identified for the purpose and is located where interconnection between equipment grounding conductors and
grounded circuit conductors is permitted or required by Article 250.
408.41 Grounded Conductor Terminations. Each grounded conductor shall terminate within the panelboard in an individual terminal that is not also used for another conductor.
Exception: Grounded conductors of circuits with parallel conductors shall be permitted to terminate in a single terminal if the terminal is identified for connection of more than one conductor.
IV. Construction Specifications
408.50 Panels. The panels of switchboards shall be made of moisture-resistant, noncombustible material.
408.51 Busbars. Insulated or bare busbars shall be rigidly mounted.
408.52 Protection of Instrument Circuits. Instruments, pilot lights, potential transformers, and other switchboard devices with potential coils shall be supplied by a circuit that is protected by standard overcurrent devices rated 15 amperes or less.
Exception No. 1: Overcurrent devices rated more than 15 amperes shall be permitted where the interruption of the circuit could create a hazard. Short-circuit protection shall be provided.
Exception No. 2: For ratings of 2 amperes or less, special types of enclosed fuses shall be permitted.
408.53 Component Parts. Switches, fuses, and fusehold-ers used on panelboards shall comply with the applicable requirements of Articles
240 and 404.
408.54 Maximum Number of Overcurrent Devices. A panelboard shall be provided with physical means