If you've got them wired correctly in the field, you'll have 4 conductors (2 power, 2 circuit) coming in and out from each smoke, with the last smoke and an EOL relay.
Most typically you'll see R/B for power and Y/G for circuit, but it depends on what colors your cable has and logic usually.
If you've got them wired correctly in the field, you'll have 4 conductors (2 power, 2 circuit) coming in and out from each smoke, with the last smoke and an EOL relay.
Most typically you'll see R/B for power and Y/G for circuit, but it depends on what colors your cable has and logic usually.
Whoa, wait a second, that doesn't sound right for a 4 wire smoke at all.
a 4 wire smoke, actually has 8 conductors tied to it, whether it's feeding the next smoke or an EOL relay for power supervision. For simplicity's sake, 2 are for switched power and the second pair is wired to an initiating circuit on the panel.
A 2 wire, will have a total of 4 "connections" with 2 being the cabling feeding it and the other 2 being additional cabling (other detectors) or the EOLR, completing the circuit.
For terminals, it depends on the smoke detector, but all the major ones I have used that have that terminal have had any second terminal electrically common with it's counterpart.
I believe it was a way to get people out of the practice of twisting or looping the wires under the terminals, negating the proper supervision of the loop.
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