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Electrical
Systems
Manufacturer Requirements
FEDERAL LAW
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 supply 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. |
Ungrounded conductors connected to a storage
battery, other than cranking motor conductors, must have overcurrent
protection in accordance with 183.455(a).
This section of the regulation provides an exception to 183.455(b)
which allows the overcurrent protection location for the battery
cable, as described, to be a distance from the connection
at the battery (Section 182.455(b)
requires the overcurrent protection to be at the power source).
The distance from the battery connection depends on whether
or not the overcurrent protection device is equipped with
a switch.
- Overcurrent protection without a switch must
be located within 72 inches of the battery connection. See
Figure
25.
- Overcurrent protection with a switch may
be located anywhere along the battery cable, if the boat
was built before August 1, 1985. See
Figure 25.
The only exception to the overcurrent protection
requirement for conductors is for cranking motor power conductors,
as excepted in 183.455(e). Schematics
of typical main supply circuits are shown in Figure
25.
TO COMPLY WITH THE LAW
Except for the power supply conductors
to the engine cranking motor:
- Is there a manually reset, tripfree
circuit breaker or fuse in each ungrounded output
conductor from each storage battery?
- Is the circuit breaker or fuse within
72 inches of the battery, measured along the conductor?
or
- If the boat was built prior to August
1, 1985, is there a switch in the circuit to disconnect
the battery?
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