[Code of Federal Regulations]
[Title 46, Volume 4]
[Revised as of October 1, 2002]
From the U.S. Government Printing Office via GPO Access
[CITE: 46CFR111.10-4]

[Page 219]
 
                           TITLE 46--SHIPPING
 
    CHAPTER I--COAST GUARD, DEPARTMENT OF TRANSPORTATION (CONTINUED)
 
PART 111--ELECTRIC SYSTEMS--GENERAL REQUIREMENTS--Table of Contents
 
                      Subpart 111.10--Power Supply
 
Sec. 111.10-4  Power requirements, generating sources.

    (a) The aggregate capacity of the electric ship's service generating 
sources required in Sec. 111.10-3 must be sufficient for the ship's 
service loads.
    (b) With the ship's service generating source of the largest 
capacity stopped, the combined capacity of the remaining electric ship's 
service generating source or sources must be sufficient to supply those 
services necessary to provide normal operational conditions of 
propulsion and safety, and minimum comfortable conditions of 
habitability. Habitability services include cooking, heating, air 
conditioning (where installed), domestic refrigeration, mechanical 
ventilation, sanitation, and fresh water.
    (c) The capacity of the ship's service generating sources must be 
sufficient for supplying the ship's service loads without the use of a 
generating source which is dependent upon the speed or direction of the 
main propelling engines or shafting.
    (d) Operating generators must provide a continuous and uninterrupted 
source of power for the ship's service load under normal operational 
conditions. Any vessel speed change or throttle movement must not cause 
a ship's service load power interruption.
    (e) Vessels with electric propulsion that have two or more constant-
voltage generators which supply both ship's service and propulsion power 
do not need additional ship's service generators provided that with any 
one propulsion/ship's service generator out of service the capacity of 
the remaining generator(s) is sufficient for the electrical loads 
necessary to provide normal operational conditions of propulsion and 
safety, and minimum comfortable conditions of habitability.
    (f) A generator driven by a main propulsion unit (such as a shaft 
generator) which is capable of providing electrical power continuously, 
regardless of the speed and direction of the propulsion shaft, may be 
considered one of the ship's service generating sets required by 
Sec. 111.10-3. A main-engine-dependent generator which is not capable of 
providing continuous electrical power may be utilized as a supplemental 
generator provided that a required ship's service generator or 
generators having sufficient capacity to supply the ship's service loads 
can be automatically brought on line prior to the main-engine-dependent 
generator tripping off-line due to a change in the speed or direction of 
the main propulsion unit.

[CGD 94-108, 61 FR 28277, June 4, 1996; 61 FR 36787, July 12, 1996]