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Douglas Krantz's Technician's CornerThe A fire alarm is the detection of a fire and the telling people about the fire. Between the detect and the tell is a whole Fire Alarm System. How does it work?
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The A fire alarm is the detection of a fire and the telling people about the fire. Between the detect and the tell is a whole Fire Alarm System. How does it work?
http://www.douglaskrantz.com/
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Douglas Krantz's Technician's Corner | douglaskrantz.com Reviews
https://douglaskrantz.com
The A fire alarm is the detection of a fire and the telling people about the fire. Between the detect and the tell is a whole Fire Alarm System. How does it work?
douglaskrantz.com
Class A is Better than Class B -- Why?
http://www.douglaskrantz.com/SCClassAB.html
Fire Alarm - Description. During a fire, in Class B wiring style, if a wire breaks, the devices beyond the break won't communicate with the panel. In Class A wiring style, the panel can back-feed communication on the return loop, so most if not all devices still communicate. Class A Wiring will survive better than Class B Wiring. Class A is Better than Class B - Why? The Fire Alarm System is a Life Safety System - so the occupants of a building can escape quickly, the idea behind a Fire Alarm System.
Shorting the Notification Appliance Circuit Keeps It from Sounding in Alarm
http://www.douglaskrantz.com/SCShortedNAC.html
Fire Alarm - Description. A shorted Notification Circut, whether it's a wire-to-wire short, a shorted device, or a shorted end-of-line resistor, will never have 24 volts applied from the fire alarm panel. Shorting a Notification Appliance Circuit (NAC) Will Prevent the NAC from Working. Fire Alarm NAC Circuit Shorted Trouble. Some time ago, at a high rise business and condominium building, I inspected a fire alarm system. On arrival, the fire alarm control panel showed trouble. The detection of a wire-to...
Electronics - What is a Flyback Diode?
http://www.douglaskrantz.com/Flyback_Diode.html
Like a check valve with water, a diode freely conducts electrical current in one direction, and stops the electrical current from flowing the other direction. It's next to a DC Relay. What is it, and why is it there? A relay consists of an electromagnet and a moving armature. As it moves, the armature opens or closes electrical contacts (make or break contact). Someone Thinks the Flyback Diode is Important. Over the world spend. Diodes, they must. The diode protects,. Let's look at the. The relay, which.
Fire Alarm Panel - What Are the Lights and Buttons For?
http://www.douglaskrantz.com/Fire_Alarm_System.html
Fire Alarm - Description. The green light indicates the panel has power and is working. The red light comes on when there is a Fire Alarm. Amber lights come on when a system the panel is Supervising is in Alarm or when there is trouble with the Fire Alarm System. Fire Alarm System - What are the Lights and Buttons For? You're now in charge of the building. Be it an apartment building, office building, business complex, or industrial complex and now you have to deal with the fire alarm system. The fire al...
Friday-Afternoon-Repair
http://www.douglaskrantz.com/SCFridayAfternoonRepair.html
Fire Alarm - Maintenance. A Friday-Afternoon-Repair isn't a repair. It's a way of hiding troubles on a fire alarm control panel so the owner doesn't have to listen to the trouble sounder all weekend. Presumably this is done so the fire alarm service company can return the following week to fix the troubles. If the fire panel shows normal, you may never get back to fix a trouble; if the fire panel shows trouble, you'll always come back to fix it. Actually had been there all along, but were hidden. The tro...
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Douglas Krantz's Technician's Corner
Electronic Fire Alarm Systems. A fire alarm system detects fire and tells people about the fire. However, between the detect and the tell, there's an unseen, building wide electronic fire alarm system. Codes versus Making the Fire Alarm System Work. At least once a fire alarm system has been installed and finished, the codes and rules describe how it should work. However, if the electronics of a fire alarm system don't work, the codes and rules don't do any good. Douglas Krantz Describing How It Works.
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