Ground fault: MS-5024 Trouble Code | Fire Alarm Resource Center
Ground fault
trouble
Fire-Lite MS-5024
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What This Code Means
The control panel has detected that a supervised circuit, such as a zone or NAC, is in contact with earth ground.
Common Causes
1Field wiring of a zone or NAC in contact with earth ground
2Use of conduit for the Earth Ground connection instead of a dedicated wire
3Lightning induced transients
4Improper Earth Ground wire gauge (less than 14 AWG)
Resolution Steps
To get into the Troubleshoot Mode, press MODE 8768 and [ENTER/STORE]. Pressing 1 through 5 followed by [ENTER/STORE] displays the zone voltage of the selected zone. Pressing b1 followed by [ENTER/STORE] displays the voltage on NAC #1. Pressing b2 followed by [ENTER/STORE] displays the voltage on NAC #2. Verify that a separate Earth Ground connection (minimum 14 AWG) is made to the grounding stud and not via conduit. Inspect field wiring for contact with ground.
