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Fire Alarm -- Maintenance

ZX09Q is the Date Code on the Backup Battery?
Actually, I've seen one manufacturer date code that was in plain English, but usually, the date codes are like this. There's really no way to regularly figure out how old the battery is from the manufacturer.
Douglas Krantz -- Fire Alarm Engineering Technician, Electronic Designer, Electronic Technician, Writer






Why are Battery Date Codes so Cryptic?

By Douglas Krantz

For safety reasons, the NFPA Code (National Fire Protection Association) requires the replacement of fire alarm batteries within 5 years of manufacture date, and that they be replaced in pairs. The also require the new batteries to be from same manufacturer, with the same date codes stamped on both batteries. The NFPA goes on to specify that the manufacturer date codes be in plain English so anyone inspecting the system can see the date of manufacture.

Still, none of the date codes are in plain English.

So far, the manufacturers have resisted marking the batteries this way. They know that if they did mark the batteries with readable date codes, that when given the choice, people like you or me will buy only the newest batteries. The old ones would just sit on the shelf, getting older by the day.
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UL (Underwriters Laboratories) would like readable date codes, but they say "Don't hold your breath" waiting for the manufacturers to change. The NFPA, on the other hand, thinks that manufactures "will get over it" and start using plain English on the date codes.

So far, the manufacturers haven't used plain English for the date codes.

Whether it's UL or NFPA that correctly assessed the manufacturer's use of plain English on the date codes, only time will tell.







Douglas Krantz

Describing How It Works
writer@douglaskrantz.com
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612/986-4210

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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
.