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Fire Suppression

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








Why Are There Waterflow Alarms When No Water is Flowing? -- Between building trades, there's a natural line of demarcation. Sprinkler pipe fitters don't like working on a fire alarm system; they...Read More

What is a Waterflow Switch? -- The fire alarm waterflow switch, a delayed action mechanical/electrical assembly, is a conventionally wired fire alarm device. The fire department reacts... Read More

What is a Dry Sprinkler Valve? -- When a fire starts burning in a building, action needs to be taken early... before the fire has grown out of control. Taking this action, sometimes before anyone even... Read More

Why Does It Seem that Dry Sprinkler Systems Only Show Low Air Pressure At Night? -- Doesn't it always seem to happen? In the middle of the night, someone's fire alarm fire alarm system sends... Read More

What Turns On a Fire Pump? -- Fire pump controller boxes are large, and the only people who should even open the controllers are authorized sprinkler... Read More

Should the Main Fire Panel Release the Fire Suppression? -- The greater number of systems controlled by one computer, the greater number of systems messed up when that one computer messes up.... Read More

Which is Worse -- Fire or Water? -- At some point a decision needs to be made, which is worse - the fire or excess water... Read More

How Can a Jockey Pump Make False Waterflow Alarms? -- It was 8:00 o'clock at night, and there I was standing in front of the fire alarm panel. The fire department had already been there and left, but because of waterflow... Read More








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Douglas Krantz

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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
.