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TITLE 46 - SHIPPING
CHAPTER I - COAST GUARD, DEPARTMENT OF HOMELAND SECURITY
SUBCHAPTER J - ELECTRICAL ENGINEERING
PART 111 - ELECTRIC SYSTEMS - GENERAL REQUIREMENTS
111.105 - 32 - Bulk liquefied flammable gas and ammonia carriers.
(a) Each vessel that carries bulk liquefied flammable gases or ammonia as a cargo, cargo residue, or vapor must meet the requirements of this section.
(b) As used in this section: (1) The terms gas-safe and gas-dangerous spaces are used as defined in 154.7 of this chapter.
(2) The term gas-dangerous does not include the weather deck of an ammonia carrier.
(c) Each submerged cargo pump motor design must receive concept approval by the Commandant (G-MSE) and its installation must receive plan approval by the Commanding Officer, Marine Safety Center.
(d) Electrical equipment must not be installed in a gas-dangerous space or zone, except: (1) Intrinsically safe electrical equipment and wiring, and (2) Other equipment as allowed in this section.
(e) A submerged cargo pump motor, if installed in a cargo tank, must meet 111.10531(d).
(f) Electrical equipment must not be installed in a hold space that has a tank that is not required to have a secondary barrier under 154.459 of this chapter, except: (1) Through runs of marine shipboard cable; (2) Explosionproof lighting fixtures; (3) Depth sounding devices in gastight enclosures; (4) Log devices in gastight enclosures; (5) Impressed current cathodic protection system electrodes in gastight enclosures; and (6) Armored or MI type cable for a submerged cargo pump motor.
(g) Electrical equipment must not be installed in a space that is separated by a gastight steel boundary from a hold space that has a tank that must have a secondary barrier under the requirements of 154.459 of this chapter, except: (1) Through runs of marine shipboard cable; (2) Explosionproof lighting fixtures; (3) Depth sounding devices in gastight enclosures; (4) Log devices in gastight enclosures; (5) Impressed current cathodic protection system electrodes in gastight enclosures; (6) Explosionproof motors that operate cargo system valves or ballast system valves; (7) Explosionproof bells for general alarm systems; and (8) Armored or MI type cable for a submerged cargo pump motor.
(h) A cargo-handling room must not have any installed electrical equipment, except explosionproof lighting fixtures.
(i) A space for cargo hose storage or a space that has cargo piping must not have any installed electrical equipment, except: (1) Explosionproof lighting fixtures; and (2) Through runs of marine shipboard cable.
(j) A gas dangerous zone on the open deck must not have any installed electrical equipment, except: (1) Explosionproof equipment that is necessary for the operation of the vessel; and (2) Through runs of marine shipboard cable.
(k) A space, except those named in paragraphs (f) through (i) of this section, that has a direct opening to gas-dangerous spaces or zones must have no electrical equipment except as allowed in the gas-dangerous space or zone.
(l) Each gas-dangerous space that has lighting fixtures must have at least two branch circuits for lighting.
(m) Each switch and each overcurrent protective device for any lighting circuit that is in a gas-dangerous space must open all conductors of the circuit simultaneously.
(n) Each switch and each overcurrent protective device for lighting in a gas-dangerous space must be in a gas-safe space.
[CGD 74125A, 47 FR 15236, Apr. 8, 1982, as amended by CGD 77069, 52 FR 31626, Aug. 21, 1987; CGD 94108, 61 FR 28285, June 4, 1996; 62 FR 23909, May 1, 1997]
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