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An open-circuit fault in one of the lines supplying the fire alarm system will cause signs of power failure, but circuit breakers or fuses may show normal conditions. If the fire alarm control unit has a power failure or trouble signal feature, it will be activated, indicating that a problem exists. Refer to figure 7-22, which is a troubleshooting chart for this condition.
Figure 7-22.\Troubleshooting chart for an open fault in power circuit. |
 
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