[Code of Federal Regulations]

[Title 46, Volume 4]

[Revised as of October 1, 2006]

From the U.S. Government Printing Office via GPO Access

[CITE: 46CFR111.105-32]



[Page 248-249]

 

                            TITLE 46_SHIPPING



                  (This book contains parts 90 to 139)

 

   CHAPTER I--COAST GUARD, DEPARTMENT OF HOMELAND SECURITY (CONTINUED)

 

PART 111_ELECTRIC SYSTEMS_GENERAL REQUIREMENTS--Table of Contents

 

                   Subpart 111.105_Hazardous Locations

 

Sec.  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 Sec.  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 Sec.  111.105-31(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 Sec.  

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 Sec.  

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



[[Page 249]]



    (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 74-125A, 47 FR 15236, Apr. 8, 1982, as amended by CGD 77-069, 52 FR 

31626, Aug. 21, 1987; CGD 94-108, 61 FR 28285, June 4, 1996; 62 FR 

23909, May 1, 1997]