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Fire Alarm -- Installation

Douglas Krantz -- Fire Alarm Engineering Technician, Electronic Designer, Electronic Technician, Writer

Can Two Different NAC Circuits be in the Same Conduit in Class A? -- Keep in mind that the purpose of Class A isn't so any problem with the wiring can be repaired in a timely manner; the purpose of Class A is to keep the system working once ... Read More

How Do I Shut Down Auditorium Sound on Fire Alarm? -- I have an auditorium that needs to have the sound shut down when the fire alarm is activated. The sound board or DSP (Digital Signal Processing) has an emergency input that I can connect to, but the prints are engineered to use the SLC loop to shut it down ... Read More

It's just one more strobe, what's the problem? -- Sometimes, after a building has been established for years, the fire marshal or the building owners want to add another horn or strobe. Or maybe, with remodeling, more horns and strobes are just added to an existing Notification Appliance Circuit (NAC). Really, it is just one more strobe and the circuit works... Read More

Is Compatibility an Issue with Smoke Detectors? -- We added the devices and there was not any indication of fault in the system. So I assumed that it was OK. But when we alarm tested the new detectors ... Read More

I have this subject panel made by a company As Built -- I have a fault on the panel saying battery charger. I am unable to find the part for this panel. Can you help? ... Read More

When I install an alarm bell, the Fire Alarm Control Panel (FACP) always shows "Alarm Short Circuit" on the FACP. -- I've already checked the wiring with my ohmmeter, it's OK. I've also changed the bell (buying a new one) but the panel still shows a fault. How can I solve this problem? Read More

Do Amp Hours Start on Backup Batteries When the Alarms Go Off? -- The backup batteries are 8 amp hours (8 AH), but do those amp hours start when the alarms go off or do the 8 AH start as soon as I connect them to the panel? ... Read More

Where Should An End-Of-Line Resistor go In A Security System? -- Shouldn't the EOL resistor be physically, actually, for-real be located at the END of the loop, at the farthest point? Otherwise, isn't having the EOL resistor right there at the panel just ... Read More

Can the Booster Power Supply be Installed in the Ceiling? -- The fire alarm system isn't going to be removed after the warranty period; the fire alarm system is going to be in place as long as the building stands. Not only that... Read More

Can the Alarm Relay Contacts Be Used For Elevevator Capture? -- Usually those contacts activate with any alarm. To keep the elevator from being captured when a smoke detector in any part of the building goes... Read More

Can More Than One Class A Circuit be in a Conduit? -- How many Class A Circuits are in a single conduit isn't really the issue. The issue is separating the feed part of any Class A Circuit from... Read More

Can I Relocate a Strobe Without Reprogramming? -- Do the technicians have to reprogram the fire alarm system after relocating devices just a few inches from their original position?Read More

Is There Any Reference to Font Size for Labels? -- Is there any clear info on the marking as to Font size? As for is there a better description for a red marking, one that is uniform with code?Read More

Can a Button be Installed to Release a Door Holder? -- The workers have to pop the door off the magnet when church starts. Some of the workers are older and have difficulty closing the door. Read More

Can a Person Just Add a Horn or Strobe to an Existing Notification Appliance Circuit (NAC)? -- In a building that has been remodeled and remodeled, when a fire drill is sounded, have you ever found that a few strobes are running slow or won't even work? Then, when troubleshooting... Read More

How many T-Taps are Allowed on an SLC? -- The answer to the question of how many T-Taps is allowed --- is It Depends. It depends on the manufacturer and it depends on how easy the installer wants to make the system for the technician... Read More

What is an As-Built Plan? -- The owner of the building project is the beginning of the planning process and the end of the planning process. Conception Plans - How the building ... Read More

What Makes Interfacing the Fire Alarm to Elevator Capture Difficult? -- People are afraid of fire. They also know that where there's smoke, sometimes there's fire. That's why they don't want the elevator to... Read More

It's the Volunteer Firefighter that Reads the Panel -- I suppose it was used because the technician programming the fire alarm system was totally familiar with the acronym AFA and what it means... Read More

Why Use Pigtails or a UL Approved End-of-Line Resistor? -- Many times, a fire alarm system installer will put the leads of an end-of-line resistor... Read More

What is the Difference Between an End of Line Resistor and a Terminating Resistor? -- In electronics, at the end of the communication line, there's often a Terminating Resistor. In fire alarm and security systems ... Read More

Does the NO Mean Normally Open of Normally Closed on a Tamper Switch? -- To figure out the normally open and normally closed contacts for switches on fire suppression systems, use ... Read More

When a New Air Diffuser is Installed, Why is the Fire Alarm Company at Fault? -- I was at a lunch meeting where the State Fire Marshal (AHJ) was speaking. One of the things that he talked about... Read More

Does Anyone Return to Make the Installation Look Good? -- My father-in-law once told me "Make it purdy the first time; you'll always come back to make it work, you'll never come back to... Read More