Grounding issue for outdoor explosion-proof manual alarms in fire protection systems
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Recently, the fire alarm control panel of our gas detection system has been intermittently reporting an outdoor explosion-proof manual alarm grounding fault – that is, it reports a grounding fault for a while and then automatically returns to normal, with the fault lasting only one or two minutes. The gas detection system uses a Honeywell XLS1000 fire alarm system; there are 4 or 5 BG Range units connected together and fed into an input module called SIGA-IO. The manual alarms are equipped with normally closed contacts, meaning that when the glass panel is intact, an open circuit is generated, while pressing the glass panel results in a closed circuit. At present, we don’t have any relevant documentation available, so we don’t understand the principle behind this grounding fault issue. We would appreciate some guidance from those who are more knowledgeable on this matter.
Why isn’t anyone replying? Experts, please give some advice! As an additional note, our location is by the sea, so the air humidity is quite high. To address this issue, we used silicone sealant for sealing, and we also removed the manual switches in sections to check whether there were ground fault errors. However, the principle behind grounding isn’t clear, and there are no parameters available for reference; it’s a bit difficult to know what to do. Please advise!