Section 8 --- Electrical Systems - House
Cayman 2005
276
FUSES
The 12 Volt DC fuses, located in this distribution panel, service the
interior house lighting, ventilation fans, monitor panel, furnace and
water heater. Should a fuse blow it will be evident by the broken
metal strip located in the center of the fuse. Replacement fuses should
be of the same amperage. If a higher rated fuse is installed it can dam-
age the wiring. Fuse current set points follow much of the same electrical
principle as the 120 Volt AC breakers. Using 12 Volt DC as the electro-
motive force can make it more susceptible to outside influences, such as
corrosion from weathering or oxidation.
The large variety of applications this voltage can be used in makes it
a staple for most of the recreational vehicle and automotive industries.
The danger from shocks with this voltage is minimized, but can still
occur. A good example is when a magnetic field is generated, then col-
lapses when the power supply is cut. The result is a discharge that can
reach tens of thousands of volts for a short time period. Care should be
used when working with this voltage as current values can be quite high,
like in the case of battery cables.
Shorting a battery cable to ground with a battery at a reasonable state
of charge can result in a fire or serious personal injury from a burn.
Tools of the Trade
Two different testing tools maybe be used for testing electrical circuits.
Either may be used, depending upon personal preference. In any situation, the
testing tool is an invaluable piece of equipment when it comes to determining
an electrical problem.
Test Light:
One of the most widely used tools for testing a 12 Volt DC problem is the test light.
Test Lights come with a light bulb, probe and ground clip. The test light
may be the better suited tool if a 12 Volt DC light is not working.
Volt Ohm Meter:
A Volt Ohm Meter (VOM) is used to perform a multitude of tests. It is
generally used when exact values are needed for evaluation. These meters
come in analog or digital format and measure a wide scale of voltages and
perform a variety of functions. In the case of a charging system problem
the meter may be the tool of choice.
Amperage Chart.
ATO Fuse
amperagechart
060086B
090333g
090333b
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