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Fire Alarm -- Description

When the alarm sounds, don't silence, call the fire department, get out with everyone else
The evacuation plan can take many forms, depending on the building. The reason for writing the plan down is that later it can be changed.
Douglas Krantz -- Fire Alarm Engineering Technician, Electronic Designer, Electronic Technician, Writer






Why Have a Written Fire Evacuation Plan?

By Douglas Krantz

One time, I had a fire inspector tell me that he requires a written evacuation plan for all buildings. The reason, he said, is not that the evacuation plan wouldn't be perfect as it was written, but that writing the plan out, it could then be changed.

No plan is perfect. Without a plan, sooner or later, someone will think the plan should be improved. If the plan was never written down, that person can change what they do in case of fire, but that would be it; only that person has changed their procedure.

On the other hand, when a written plan is changed, not just one person will know about the new evacuation plan, everyone will know about the new plan.

-- In a school, each staff member will know who needs to be looking for the fire, who needs to escort the students out of the building, who needs to be checking rosters to make sure everyone left safely.
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-- In a hospital, each department will know who will close all the patient doors, who will grab a fire extinguisher, who will meet the firemen.

-- In a tall office building, each person will know who should get out of the building first, who should check out the fire, who should be manning the fire command center.

In each case, written plans help everyone to know their jobs, even if their job is to leave the building and let the professionals come in to fight the fire.






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Douglas Krantz

Describing How It Works
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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
.