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Topic:
Security system questions ( smoke and carbon )
This thread has 16 replies. Displaying posts 16 through 17.
Post 16 made on Sunday September 16, 2018 at 21:48
Ernie Gilman
Yes, That Ernie!
Joined:
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December 2001
30,104
On September 16, 2018 at 18:44, Brad Humphrey said...
I think he already has them all but even if he did, 2-wire smokes do not cost that much. So he could replace them all without breaking the bank.
Your idea would work but they are not technically in series.

?

They are still wired parallel but in a daisy chain fashion.

I have to interrupt to verify something here. What's meant by the red/black wire? Is that two wires that are twisted together, so that in effect there's only two conductors, a red/black one and a green/white one, going to each detector? I don't see any detector model numbers and I can't believe anyone would call the following the description of parallel wiring... unless something not described is going on with four wires instead of what looks like two wires.

As an example, it would start with using the white/green to the detector, then the red/black from there back to the panel, which would tie directly to the white/green of the next detector, then red/black back again from there to the next again. Until we reach the final detector where the EOL is wired (or at the panel on the red/black back from the last one). Only the 1st white/green is connected to the alarm panel.

Now, if red/black is one conductor and green/white is another conductor, that's a classic definition of series wiring.

If ALL of the white/green wires went to one terminal on the alarm, and all the red/black wires went to another terminal on the alarm, and the EOL resistor went from white/green to red/black, that would be parallel wiring.
A good answer is easier with a clear question giving the make and model of everything.
"The biggest problem in communication is the illusion that it has taken place." -- G. “Bernie” Shaw
Post 17 made on Monday September 17, 2018 at 13:21
imt
Long Time Member
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June 2007
466
Thanks Brad. I understood what you are saying and was my thought exactly. Yes daisy chaining.

Ernie,

What Brad was saying is that lets say there is one 4 conductor wire home run from each detector to the panel. For argument sake there are 4 color wires: red, black, green and white.

The white and green are used for the circuit, at the alarm panel terminal, for 2-wire smokes. The smokes have 2 sets of terminals. In and out. The In terminals gets the green and white wires,. The out's get the red and black. Those run back to the panel which then connect to one pair of green and white wires running to another smoke's input terminals. The Output terminal again get connected to the red and black and connect to another set of white and green, etc.

On the last detector only the white and green are used to the input and the EOL resistor is put across the output terminals. Someone correct me if I am wrong on this.

If this was using something like the System Sensor 2-wire smokes with the Module, you could have connected the last set of red and black to the output of the last smoke's terminal and connected them to the optional loop connection terminals.
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