Why should fire power supplies not be equipped with leakage protection
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I read in the book that fire protection power supplies should not be equipped with leakage protection? Could you tell me why? Thank you!
If there is a leakage in the wiring, the circuit breaker will cut off the power supply, and as a result the fire protection system will not be able to function. In such a situation, if a fire breaks out, the fire protection system will not be able to issue alerts or provide assistance promptly, which can lead to an escalation of the fire and the loss of the best opportunity for rescue.
Under normal circumstances, fire protection loads should not be equipped with leakage protection, except in special cases. For example: The first is the environmental impact; in humid environments such as fishery warehouses and cold storage facilities, regulations specify that electrical circuits must be equipped with leakage protection. Secondly, when the wiring distance is long, the capacity is low, and the short-circuit current is so small that it cannot cause the switch to trip, a leakage protection device should be installed. In other cases, do not blindly add leakage protection to the fire protection load.
According to Article 4.3.5 of the \"Code for Design of Low-Voltage Power Distribution\" (GB 50054-95), for circuits where sudden power outages cause greater damage than overloads, the overload protection should operate by sending a signal rather than by cutting off the power supply. Circuit breakers used for fire protection equipment must be equipped with electromagnetic release mechanisms; leakage protection is not permitted.
What is the function of an electromagnetic release?
An electromagnetic release is a type of release that provides only magnetic protection, that is, short-circuit protection. It essentially functions as a magnetic force; when the current is high enough, the magnetic force generated overcomes the force of the return spring, causing the armature to be pulled and thereby activating the mechanism to disconnect the circuit.
Under normal circumstances, fire protection loads should not be equipped with leakage protection, except in special cases. For example: The first is the environmental impact; in humid environments such as fishery warehouses and cold storage facilities, regulations specify that electrical circuits must be equipped with leakage protection. Secondly, when the wiring distance is long, the capacity is low, and the short-circuit current is so small that it cannot cause the switch to trip, a leakage protection device should be installed. In other cases, do not blindly add leakage protection to the fire protection load.
Ignoring the regulations, it’s more important that the fire-fighting equipment is in good condition and ready for use