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CODE OF FEDERAL REGULATIONS – TITLE
33 – NAVIGATION AND NAVIGABLE WATERS
PART 183—BOATS AND ASSOCIATED EQUIPMENT
Subpart I—Electrical Systems
Sec. 183.435—Conductors in circuits
of 50 volts or more
(a) Each conductor in a circuit that has a nominal
voltage of 50 volts or more must be:
(1) A conductor that has insulation
listed and classified moisture resistant and flame retardant
in Article 310, NFPA No. 70, National Electric Code;
(2) A flexible cord type SO, STO, ST,
SJO, SJT, or SJTO listed in Article 400, NFPA No. 70, National
Electric Code;
(3) A conductor that meets IEEE Standard
45;
(4) A conductor that meets UL Standard
1426.
(b) Where the nominal circuit voltage of each
of three or more current carrying conductors in a duct, bundle,
or cable is 50 volts or more, the amperages of each of those
conductors must not exceed the value in table 5 multiplied
by the correction factor in note 2 to Table 5 for the number
of conductors that carry 50 volts or more.
(c) This section does not apply to communication
systems; electronic navigation equipment; resistance conductors
that control circuit amperage; conductors in secondary circuits
of ignition systems; and pigtails of less than seven inches
of exposed length.
[CGD 73-217, 42 FR 5944, Jan. 31, 1977;
42 FR 24739, May 16, 1977, as amended by CGD 80-047 and CGD
80-046, 45 FR 85450, Dec. 29, 1980; CGD 87-009, 53 FR 36972,
Sept. 23, 1988]
Sec. 183.440—Secondary circuits of
ignition systems
(a) Each conductor in a secondary circuit of
an ignition system must meet SAE Standard J557.
(b) The connection of each ignition conductor
to a spark plug, coil, or distributor must have a tight fitting
cap, boot, or nipple.
[CGD 73-217, 42 FR 5944, Jan. 31, 1977,
as amended by USCG-1999-5832, 64 FR 34716, June 29, 1999]
Sec. 183.445—Conductors: Protection
(a) Each conductor or group of conductors that
passes through a bulkhead, structural member, junction box,
or other rigid surface must be protected from abrasion.
(b) Each ungrounded terminal or stud that is
continuously energized must meet Sec. 183.455 or must have
a boot, nipple, cap, cover, or shield that prevents accidental
short-circuiting at the terminals or studs.
[CGD 81-092, 48 FR 55736, Dec. 15, 1983]
Sec. 183.455—Overcurrent protection:
General
(a) Each ungrounded current-carrying conductor
must be protected by a manually reset, tripfree circuit breaker
or fuse.
(b) A manually reset, trip-free circuit breaker
or fuse must be placed at the source of power for each circuit
or conductor except:
(1) If it is physically impractical to place
the circuit breaker or fuse at the source of power, it may
be placed within seven inches of the source of power for
each circuit or conductor measured along the conductor.
(2) If it is physically impractical to place
the circuit breaker or fuse at or within seven inches of
the source of power, it may be placed within 40 inches of
the source of power for each circuit or conductor, measured
along the conductor, if the conductor is contained throughout
its entire distance between the source of power and the
required circuit breaker or fuse in a sheath or enclosure
such as a junction box, control box, or enclosed panel.
(c) The current rating of each circuit breaker
or fuse must not exceed:
(1) For circuits of less than 50 volts, 150%
of the value of the amperage in Table 5 for the conductor
size it is protecting; and
(2) For circuits of 50 volts or more, the
value of the amperage in Table 5 for the conductor size
it is protecting. If this value does not correspond to a
standard size or rated circuit breaker or fuse the next
larger size or rated circuit breaker or fuse may be used
if it does not exceed 150% of the allowed current capacity
of the conductor.
(d) The voltage rating of each circuit breaker
or fuse must not be less than the nominal circuit voltage
of the circuit it is protecting.
(e) This section does not apply to resistance
conductors that control circuit amperage; conductors in secondary
circuits of ignition systems; pigtails of less than seven
inches of exposed length; and power supply conductors in cranking
motor circuits.
[CGD 73-217, 42 FR 5944, Jan. 31, 1977,
as amended by CGD 78-090, 44 FR 68466, Nov. 29, 1979]
Sec. 183.460—Overcurrent protection:
Special applications
(a) Each ungrounded output conductor from a
storage battery must have a manually reset, trip-free circuit
breaker or fuse, unless the output conductor is in the main
power feed circuit from the battery to an engine cranking
motor. The circuit breaker or fuse must be within 72 inches
of the battery measured along the conductor, unless, for boats
built prior to August 1, 1985, the circuit has a switch that
disconnects the battery.
(b) Each ungrounded output conductor from an
alternator or generator, except for self-limiting alternators
or generators, must have a circuit breaker or fuse that has
a current rating that does not exceed 120 percent of the maximum
rated current of the alternator or generator at 60 deg. C.
[CGD 73-217, 42 FR 5944, Jan. 31, 1977,
as amended by CGD 81-092, 48 FR 55736, Dec. 15, 1983]
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