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NOTE: This is an unformatted excerpt from our online fire protection training library.

Zone Classification

Incapable of Causing Ignition

This diagram illustrates a common method used to limit the voltage and the current and thus the total energy in a circuit. The resistors and fuse limit the current and the zener diodes limit the voltage. The redundant resistor and zener diode act as a backup in case one of the other devices fails.

NOTE: This is an unformatted excerpt from our online fire protection training library.

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