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Electrical
Systems
Manufacturer Requirements
FEDERAL LAW
183.455 - Overcurrent Protection
: General
(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 amperages; conductors
in secondary circuits of ignition systems; pigtails
of less than seven inches of exposed length; and power
supply conductors in cranking motor circuits. |
In addition to a current (ampere) rating, a
circuit breaker or fuse also has a voltage rating. A circuit
breaker or fuse must have a voltage rating equal to, or preferably
greater than, the nominal voltage of the circuit it is protecting.
This is to ensure that the device will operate properly when
an overcurrent (too many amperes) situation occurs. See
Figure 26.
NOTE:
Nominal circuit voltage means the named voltage — i.e.
a 12 volt DC system may charge at about 13.8 volts, but the
nominal circuit voltage is 12 volts DC.
TO COMPLY WITH THE LAW
- Is the voltage rating of each circuit
breaker or fuse equal to, or higher than, the nominal
circuit voltage of the circuit it is protecting?
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FIGURE
26 - Voltage Rating of Overcurrent Protection
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