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Style 7 Wiring is a type of wiring start from panel connects all field devices and return back to control panel. It is also called class A wiring.
Advantage of style 7/class -A wiring is that if the wire breaks from one side still the field devices get supply from other end.
Brajesh Kumar
brij.kumar33@gmail.com
Wiki User
∙ 11y ago
Wiki User
∙ 14y agoStye 4 wiring for fire alarm systems uses a single wire "daisy-chained" between detectors and ending with a resistor.
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What is fire alarm style 4?
Stye 4 wiring for fire alarm systems uses a single wire "daisy-chained" between detectors and ending with a resistor.
What is a Fire alarm circuit style y?
Style Y is a designation of circuit performance under different states of the circuit. For example: an initiating circuit and a NAC circuit may both be class B, with a panel on one end of the circuit and a resistor on the other. If there is an open on either circuit (the panel doesn't see the EOL), then a trouble is initiated at the panel. However, if there is a short between the two wires on a circuit, the panel will react very differently on the initiating circuit than it will on the NAC. Style Y means that the fire alarm panel will display a trouble on either an open or a short on the NAC circuit, where style 4 means that the Initiating circuit will generate an alarm on the panel in the event of a short, and a trouble in the event of an open.
What is the difference between 'Class A' fire alarm vs 'Class B' fire alarm wiring?
In class A wiring, 2 wires start from alarm control panel terminal, run through fire sensors / detectors and the same 2 wires run back into the alarm control panel and get connected as 2 more wires thus there would be 4 wires at the panel totally. This would help the control panel monitor all the sensors / detectors even if a loop wire breaks in the middle. In Class B wiring, the control panel is just connected to 2 wires. These 2 wires run through fire sensors / detectors and terminate at end of line resistor. Thus if any wire breaks in between the sensors that are connected to control panel end of wire would only be monitored. The broken wire side of sensors won't be monitored
What is the meaning of wiring style class a?
In the field of fire alarm wiring (and possibly others) the wiring going out to the devices in the field can be wired in several ways depending on the need for survivability. Older codes/manufacturers created a concept known as CLASS-A and CLASS-B CLASS-A is a 4 wire circuit where two wires of the circuit leave the control panel, make connection with the field devices, and then return to the same control panel. In this type installation a wire that broke or came loose would cause a TROUBLE condition but all devices would continue to be available to detect an alarm. CLASS-B is a 2 wire circuit where two wires leave the control panel, make connection to the field devices and then connect to an "END-OF-LINE" device. Each CLASS-B circuit is a "deadend". If a wire broke or came loose a trouble signal would occur, but all devices downstream of the break point would not function. ---- As technology enhanced, newer systems were able to provide more capabilities than just the two described above. The NFPA 72 Fire Alarm Standard created a system that describes the ability of each type circuit. This system describes the types of circuits as "STYLES". It also uses letters but uses the other end of the alphabet, such as Style Y, Style W, Style X
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