CFR > Title 46 - Shipping > CHAPTER I—COAST GUARD, DEPARTMENT OF HOMELAND SECURITY > SUBCHAPTER O—CERTAIN BULK DANGEROUS CARGOES (parts 150 to 155) > PART 154—SAFETY STANDARDS FOR SELF-PROPELLED VESSELS CARRYING BULK LIQUEFIED GASES > SUBPART C—Design, Construction and Equipment (§154.170 to §154.1440) > 154.1010—Electrical equipment in gas-dangerous space or zone.

154.1010—Electrical equipment in gas-dangerous space or zone.

(a) Except as allowed in this section, electrical equipment must not be installed in a gas-dangerous space or zone.
(b) Intrinsically safe electrical equipment and wiring may be in a gas-dangerous space or zone.
(c) A submerged cargo pump motor may be in a cargo tank if:
(1) Low liquid level, motor current, or pump discharge pressure automatically shuts down power to the pump motor if the pump loses suction;
(2) There is an audible and visual alarm at the cargo control station that actuates if the motor shuts down under the requirements of paragraph (c)(1) of this section; and
(3) There is a lockable circuit breaker or lockable switch that disconnects the power to the motor.
(d) A supply cable for a submerged cargo pump motor may be in a hold space.
(e) A hold space that has a tank that is not required to have a secondary barrier under § 154.459 may only have:
(1) Through runs of cable;
(2) Explosion-proof lighting fixtures;
(3) Depth sounding devices in gas-tight enclosures;
(4) Log devices in gas-tight enclosures; and
(5) Impressed current cathodic protection system electrodes in gas-tight enclosures.
(f) A space that is separated by a gastight steel boundary from a hold space that has a cargo tank that must have a secondary barrier, under the requirements of § 154.459, may only have:
(1) Through runs of cable;
(2) Explosion-proof 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) Explosion-proof motors that operate cargo system valves or ballast system valves; and
(7) Explosion-proof bells for general alarm systems.
(g) A cargo handling room may only have:
(1) Explosion-proof lighting fixtures; and
(2) Explosion-proof bells for general alarm systems.
(h) A space for cargo hose storage may only have:
(1) Explosion-proof lighting fixtures; and
(2) Through runs of cable.
(i) A space that has cargo piping may only have:
(1) Explosion-proof lighting fixtures; and
(2) Through runs of cable.
(j) A gas-dangerous zone on the weather deck may only have:
(1) Explosion-proof equipment that is for the operation of the vessel; and
(2) Through runs of cable.
(k) A space, except those under paragraphs (e) through (j) of this section, that has a direct opening to a gas-dangerous space or zone may only have the electrical equipment allowed in the gas-dangerous space or zone.