[Code of Federal Regulations]
[Title 46, Volume 7]
[Revised as of October 1, 2004]
From the U.S. Government Printing Office via GPO Access
[CITE: 46CFR183.376]

[Page 294]
 
                           TITLE 46--SHIPPING
 
   CHAPTER I--COAST GUARD, DEPARTMENT OF HOMELAND SECURITY (CONTINUED)
 
PART 183_ELECTRICAL INSTALLATION--Table of Contents
 
            Subpart C_Power Sources and Distribution Systems
 
Sec. 183.376  Grounded distribution systems (neutral grounded).

    (a) If a grounded distribution system is provided, there must be 
only one connection to ground, regardless of the number of power 
sources. This ground connection must be at the switchboard or at the 
common ground plate, which must be accessible.
    (b) Each propulsion, power, lighting, or distribution system having 
a neutral bus or conductor must have the neutral grounded.
    (c) The neutral of each grounded generation and distribution system 
must be grounded at the generator switchboard and have the ground 
connection accessible for checking insulation resistance of the 
generator to ground before the generator is connected to the bus, except 
the neutral of an emergency power generation system must be grounded 
with:
    (1) No direct ground connection at the emergency switchboard;
    (2) The neutral bus permanently connected to the neutral bus on the 
main switchboard; and
    (3) No switch, circuit breaker, or fuse in the neutral conductor of 
the bus-tie feeder connecting the emergency switchboard to the main 
switchboard.
    (d) On a metallic vessel, a grounded alternating current system must 
be grounded to the hull. On a nonmetallic vessel, the neutral must be 
connected to the common ground, except that aluminum grounding 
conductors must not be used.