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Fire Alarm -- Home

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







I have a Question

I have a question about connecting different types of hard wired smoke detectors in a loop. I have 1 Ion/Photo combo and want to add 4 more Ion style detectors to it. Can the two types work together, or do I need to keep the types all the same.

I live in an all-electric home built in 1978, and the local fire department had installed this combo Ion/Photo before we bought the home 2 years ago. The smoke detector is located in a hall between our two bedrooms in a single story home with no basement.

Thanks for any help you can provide.

Signed M K

Reply

If these smoke detectors are stand-alone smoke alarms, that is they have sounders in them, and if these are going to talk to each other so if one goes into alarm, all of them sound off, then they all have to be of the same manufacturer and they have to be compatible with each other. The manufacturer will say on the box whether they are compatible and can be used together.

Ion, Photo, and combination Detectors all can be considered to be just smoke alarms and are useable with each other. If the other compatibility issues are taken care of, there should be no problem with using them together as long as the instructions that come with the detectors are followed.

Douglas Krantz





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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
.