Douglas Krantz - Technical Writer - Describing How It Works
Go to the Fire Alarm Home Page of Douglas Krantz -- Describing How It Works
Go to the Fire Alarm Operation Map Page of Douglas Krantz - Technical Writer
Go to the General Electrical Map Page of Douglas Krantz - Technical Writer
Go to the Fire Alarm Description Map Page of Douglas Krantz - Technical Writer
Go to the Fire Alarm Installing Map Page of Douglas Krantz - Technical Writer
Go to the Fire Alarm Maintaining Map Page of Douglas Krantz - Technical Writer
Go to the Fire Alarm Testing Map Page of Douglas Krantz - Technical Writer
Go to the Fire Suppression Map Page of Douglas Krantz - Technical Writer
Go to the Science Article Map Page of Douglas Krantz - Technical Writer
Go to the Writer Home Page of Douglas Krantz -- Describing How It Works


I have a question on how something works.
Douglas Krantz -- Fire Alarm Engineering Technician, Electronic Designer, Electronic Technician, Writer




I have a Question

What are the basic parts generally available in any panel? I mean any brand. Let's say Simplex, Siemens, Edwards, Notifier, whatever it may be. There must be some default parts in all the panels. Can you please tell me what are and what the functions are?

Signed M T

I sense that you desire to know how a fire alarm system works.

The fire alarm system is made up of devices to detect fire (smoke detectors, heat detectors, pull stations, waterflow switches, etc.) and devices to let people know about the fire (horns, strobes, bells, speakers, etc.)

Between these devices and connected with wires is a control panel. The control panel has a power supply to provide power to the system as a whole, and to charge the backup batteries. The backup batteries are there to keep the fire alarm system powered if the utility power quits.

The control panel also has input and output circuitry, circuitry that makes sure everything is always connected (supervises the inputs and outputs), and circuitry to activate outputs when something happens on an input.

When a detection device senses fire, using building wiring, it tells the control panel about the fire. The control panel uses the building wiring to activate the devices that let people know about the fire.

These are the basic parts to any fire alarm system. Learning the variations on these systems requires a lifetime of learning, and new variations are constantly being developed.

Go out and learn the variations.

Douglas Krantz

Post this by your fire alarm panel -- It shows the in-house fire alarm system and how it calls the fire department.

More Articles

What is Total, Staged, and Defend-in-Place Evacuation? -- For their own safety, when the fire alarm sounds, people want to get out of a burning building. Sometimes, though, there's a hitch ... Read More

What is a Fire Alarm Zone? -- Building zones aren't determined by where the wires are run for the fire alarm system, building zones are determined by the building's fire-control -- fire-fighting divisions and by the building's smoke-control divisions... Read More

What is a Fire Alarm System? -- Long ago, as earliest method of spreading the word of fire danger, people shouted "Fire!" Depending on the circumstances, people would run... Read More

Why Have a Written Fire Evacuation Plan? -- One time, I had a fire inspector tell me that he requires a written evacuation plan for all buildings. The reason... Read More

Advertisement
PDF Book
PDF of Make It Work - Conventional Fire Alarm Systems
PDF of Make It Work - Conventional Fire Alarm Systems


Douglas Krantz

Describing How It Works
facpdoug@douglaskrantz.com

View Douglas Krantz's profile on LinkedIn



Ask
The
Technician

Readers Questions



Short Circuit
Free Subscription
I'll Send You the
Twice-Monthly
Fire Alarm
Newsletter




Articles

How Does Class A Fire Alarm Wiring Work?-- Fire alarm systems save lives and protect property. Fire alarm systems also break down because... Read More

Just What Is a Signaling Line Circuit (SLC)? -- The SLC (Signaling Line Circuit) is another way of saying Data and Power Circuit. Along with added power to run the sub-computers and their input and output circuits, it's a computer data-buss ... Read More

How is a Buffer Relay Wired Into a Door Holder Circuit? -- Like a door stop, a door holder keeps a fire door open. When smoke is detected, the door holder releases, allowing the door to shut. The door holder looks simple and innocuous enough... Read More

How Does One Find a Soft Ground Fault? -- Normally, we think of resistance like that of a resistor. The amount of resistance is built-in; no matter what voltage is used to drive the electrical... Read More

Can a Magnet Really be Used to Test a Smoke Detector? -- Smoke detectors usually have two ways of being tested. Smoke (smoke particles in the air, or some sort of canned smoke), and magnets (the activation of an internal magnetic... Read More



Electrical Flow


On this website, most references to electrical flow are to the movement of electrons.

Here, electron movement is generally used because it is the electrons that are actually moving. To explain the effects of magnetic forces, the movement of electrons is best.

Conventional current flow, positive charges that appear to be moving in the circuit, will be specified when it is used. The positive electrical forces are not actually moving -- as the electrons are coming and going on an atom, the electrical forces are just loosing or gaining strength. The forces appear to be moving from one atom to the next, but the percieved movement is actually just a result of electron movement. This perceived movement is traveling at a consistent speed, usually around two-thirds the speed of light. To explain the effects of electrostatic forces, the movement of positive charges (conventional current) is best.

See the explanation on which way electricity flows at www.douglaskrantz.com/
ElecElectricalFlow.html
.