[Code of Federal Regulations]
[Title 46, Volume 2]
[Revised as of October 1, 2004]
From the U.S. Government Printing Office via GPO Access
[CITE: 46CFR58.25-55]

[Page 269-270]
 
                           TITLE 46--SHIPPING
 
   CHAPTER I--COAST GUARD, DEPARTMENT OF HOMELAND SECURITY (CONTINUED)
 
PART 58_MAIN AND AUXILIARY MACHINERY AND RELATED SYSTEMS--Table of Contents
 
                       Subpart 58.25_Steering Gear
 
Sec. 58.25-55  Overcurrent protection for steering-gear systems.

    (a) Each feeder circuit for steering must be protected by a circuit 
breaker on the switchboard that supplies it and must have an 
instantaneous trip set at a current of at least--
    (1) 300% and not more than 375% of the rated full-load current of 
one steering-gear motor for a direct-current motor; or
    (2) 175% and not more than 200% of the locked-rotor current of one 
steering-gear motor for an alternating-current motor.
    (b) No feeder circuit for steering may have any overcurrent 
protection, except that required by paragraph (a) of this section.
    (c) Neither a main or an auxiliary steering-gear motor, nor a motor 
for a steering-gear control system, may be protected by an overload 
protective device. The motor must have a device that activates an 
audible and a visible alarm at the main machinery-control station if 
there is an overload that would cause overheating of the motor.
    (d) No control circuit of a motor controller, steering-gear control 
system, or indicating or alarm system may have overcurrent protection 
except short-circuit protection that is instantaneous and rated at 400% 
to 500% of--
    (1) The current-carrying capacity of the conductor; or
    (2) The normal load of the system.
    (e) The short-circuit protective device for each steering-gear 
control system must be in the steering-gear compartment and in the 
control circuit immediately following the disconnect switch for the 
system.

[[Page 270]]

    (f) When, in a vessel of less than 1,600 gross tons, an auxiliary 
steering gear, which Sec. 58.25-10(c)(3) requires to be operated by 
power, is not operated by electric power or is operated by an electric 
motor primarily intended for other service, the main steering gear may 
be fed by one circuit from the main switchboard. When such an electric 
motor is arranged to operate an auxiliary steering gear, neither Sec. 
58.25-25(e) nor paragraphs (a) through (c) of this section need be 
complied with if both the overcurrent protection and compliance with 
Sec. Sec. 58.25-25(d), 58.25-30, and 58.25-70 (j) and (k) satisfy the 
Commanding Officer, Marine Safety Center.