Section 111.60-23 - Metal-clad (Type MC) cable(a) Metal-clad (Type MC) cable permitted on board a vessel must be continuous corrugated metal-clad cable.(b) The cable must have a corrugated gas-tight, vapor-tight, and watertight sheath of aluminum or other suitable metal that is close-fitting around the conductors and fillers and that has an overall jacket of an impervious PVC or thermoset material.(c) The cable is not allowed in areas or applications exposed to high vibration, festooning, repeated flexing, excessive movement, or twisting, such as in engine rooms, on elevators, or in the area of drill floors, draw works, shakers, and mud pits.(d) The cable must be installed in accordance with Article 326 of NFPA 70 (incorporated by reference; see § 110.10-1 of this subchapter).(e) The side wall pressure on the cable must not exceed 1,000 pounds per foot of radius.(f) Equipment grounding conductors in the cable must be sized in accordance with Section 250.122 of NFPA 70. System grounding conductors must be of a cross-sectional area not less than that of the normal current carrying conductors of the cable. The metal sheath must be grounded but must not be used as a required grounding conductor.(g) On an offshore floating drilling and production facility, the cable may be used as interconnect cable between production modules and between fixed distribution panels within the production modules, except that interconnection between production and temporary drilling packages is prohibited. Also, the cable may be used within columns, provided that the columns are not subject to the conditions described in paragraph (c) of this section.(h) When the cable is used within a hazardous (classified) location, terminations or fittings must be listed, and must be appropriate, for the particular Type MC cable used and for the environment in which they are installed.CGD 94-108, 62 FR 23908, May 1, 1997, as amended by USCG-2003-16630, 73 FR 65199 , Oct. 31, 2008