(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.
Notes, amendments, and revision history
Authority
Authority: 46 U.S.C. 3703, 9101; Department of Homeland Security Delegation No. 0170.1.
Source
Source: CGD 74-289, 44 FR 26009, May 3, 1979, unless otherwise noted.