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
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 email@example.com
This is a wiring method used primarily in Fire Alarm systems. It means there are two paths for an alarm to be detected. A Class A circuit will have two wires from the alarm panel to the detector (heat, smoke, etc.) AND two more wires that go from the detector back to the panel. The detector now has two paths to report an alarm. The official definition states that any single wire break shall not prevent the alarm signal from reporting to the panel. Since both ends of the circuit end up back at the panel, it can directly monitor the wires for breaks. The alarm panel must be a model designed for Class A circuits. The other type of circuit found in fire alarm systems, Class B, omits the return wires and has just one path for the alarm. Class B circuits have a resistor placed at the end to provide supervisory current to monitor the wires for breaks. Class A and B can also be applied to alarm notification circuits, like bell, horn, speaker, and strobe circuits. Same principles apply, only in reverse. Now the signal goes from the panel to the notification appliance.
With an older alarm clock ... one with hands on the front and a wind-up key in the back ... you get one (1) hour of sleep, because the clock doesn't know the difference between AM and PM. With a more modern LED digital clock, you get thirteen (13) hours; the display has that little dot on the side, so you can tell the difference between AM and PM when you're setting the time or the alarm.
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