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Chapter 5
Ignition Protected Devices
Many electrical devices in everyday use tend to “arc” or
spark when being used. These include motors, fans,
switches, relays, etc.
Vessels employ many of these same devices but they are
shielded from any sparking that may cause the device to
ignite with any vapors such as found in the engine and/
or fuel tank areas. Shielded devices are known as being
ignition protected.
When replacing any electrical device in the engine
compartment make sure it is ignition protected. This
means it has been tested and normally the device is
stamped with a marking making it safe to use. Do not
install any electrical device before ensuring it is ignition
protected.
Many automotive stores sell replacement engine electrical
parts such as alternators and starters. They do not feature
flame arrestors and therefore must not be used in the
engine compartment. Use only the engine manufacturer’s
approved replacement parts in the engine compartment.