The provisions of Article 550 of NFPA 70 are adopted by reference with the following modifications:
1. Revise section 550.1 to read:
"Scope. To the extent such installations are subject to regulation by the City of Chicago, the provisions of this article cover the electrical conductors and equipment installed within or on mobile homes, the conductors that connect mobile to a supply of electricity, and the installation of electrical wiring, luminaires, equipment, and appurtenances related to electrical installations within a mobile home park up to the mobile home service- entrance conductors or, if none, the mobile home service equipment.
Manufactured homes shall comply with Chapters 1 through 4 of this Code with regard to materials, electrical installation and electrical construction methods.
Informational Note: For additional information on manufactured housing see NFPA 501-2013, Standard on Manufactured Housing, and Part 3280, Manufactured Home Construction and Safety Standards, of the Federal Department of Housing and Urban Development."
2. Revise section 550.10 to read:
"Power Supply.
(A) Feeder. The power supply to the mobile home shall be a feeder assembly consisting of a permanently installed feeder of at least 60 amperes.
(B) Point of Entrance. The point of entrance of the feeder assembly to the mobile home shall be in the exterior wall, floor, or roof.
(C) Mast Weatherhead or Raceway. The permanent feeder shall be installed by one of the following means:
(1) One mast weatherhead installation, installed in accordance with Article 230, containing four continuous, insulated, color-coded feeder conductors, one of which shall be an equipment grounding conductor
(2) A metal raceway from the disconnecting means in the mobile home to the underside of the mobile home, with provisions for the attachment to a suitable junction box or fitting to the raceway on the underside of the mobile home."
3. Revise Section 550.15 to read:
"Wiring Methods and Materials. Except as specifically limited in this section, the wiring methods and materials included in this Code shall be used in mobile homes and manufactured homes.
(A) Metal Faceplates. Where metal faceplates are used, they shall be effectively grounded.
(B) Installation Requirements. If a range, clothes dryer, or similar appliance is connected by metal- covered cable or flexible metal conduit, a length of not less than 900 mm (3 ft) of free cable or conduit shall be provided to permit moving the appliance. The cable or flexible metal conduit shall be secured to the wall. Type NM or Type SE cable shall not be used to connect a range or dryer.
(C) Raceways. Where rigid metal conduit or intermediate metal conduit is terminated at an enclosure with a locknut and bushing connection, two locknuts shall be provided, one inside and one outside of the enclosure. Surface raceway shall be permitted. All cut ends of conduit shall be reamed or otherwise finished to remove rough edges.
(D) Switches. Switches shall be rated as follows:
(1) For lighting circuits, switches shall be rated not less than 15 amperes, 120 to 125 volts, and in no case less than the connected load.
(2) For motors or other loads, switches shall have ampere or horsepower ratings, or both, adequate for loads controlled. (An ac general-use snap switch shall be permitted to control a motor 2 hp or less with full-load current not over 80 percent of the switch ampere rating.)
(E) Under-Chassis Wiring (Exposed to Weather).
(1) Where outdoor or under-chassis line-voltage (120 volts, nominal, or higher) wiring is exposed to moisture or physical damage, it shall be protected by rigid metal conduit or intermediate metal conduit. The conductors shall be suitable for wet locations.
Exception: Electrical metallic tubing or rigid nonmetallic conduit shall be permitted where closely routed against frames and equipment enclosures
(2) The conductors shall be Type TW, or equivalent.
(F) Boxes, Fittings, and Cabinets. Boxes, fittings, and cabinets shall be securely fastened in place and shall be supported from a structural member of the home, either directly or by using a substantial brace.
(G) Appliance Terminal Connections. Appliances having branch-circuit terminal connections that operate at temperatures higher than 60°C (140°F) shall have circuit conductors as described in (1) or (2) of this subsection.
(1) Branch-circuit conductors having an insulation suitable for the temperature encountered shall be permitted to be run directly to the appliance.
(2) Conductors having an insulation suitable for the temperature encountered shall be run from the appliance terminal connection to a readily accessible outlet box placed at least 300 mm (1 ft) from the appliance. These conductors shall be in a suitable raceway that shall extend for at least 1.2 m (4 ft).
(H) Component Interconnections. Fittings and connectors that are intended to be concealed at the time of assembly shall be listed and identified for the interconnection of building components. Such fittings and connectors shall be equal to the wiring method employed in insulation, temperature rise, and fault- current withstanding and shall be capable of enduring the vibration and shock occurring in mobile home transportation."