4 wire smoke/heat detectors

[Patrick Griffin]

Hi everyone,

Would someone have a diagram of how 4 wire smoke dectectors would be wired, i know 2 wires are for power and the other 2 for the alarm but i have no idea how these are wired. Some of the images that come up on a google search arent great.

Cheers!!

 

[cprfenom]

Hi everyone,

Would someone have a diagram of how 4 wire smoke dectectors would be wired, i know 2 wires are for power and the other 2 for the alarm but i have no idea how these are wired. Some of the images that come up on a google search arent great.

Cheers!!

Forgive me, but wouldn't the wiring diagram not tell you this? You must have the model number of the device you want to fit?

 

[Patrick Griffin]

Im not installing anything, my knowledge on fire alarms is rather limited, im trying to learn as much as i can about them at the moment.

 

[trev]

Let's have details of the product you have in mind, then we'll be able to help you out properly.
I know you say that it's a theoretical question but something must have caused your interest.

 

[Geordie Spark]

Let's have details of the product you have in mind, then we'll be able to help you out properly.
I know you say that it's a theoretical question but something must have caused your interest.

Theoretically speaking of course.

 

[tazz]

The term 4 wire system usually relates, to 2 wire zone circuit and separate 2 wire sounder circuit.

 

[Octopus]

Google is your friend, enter the make and model and "installation instructions" and I think you should find what you want.

 

[tazz]

Maybe you need to understand how conventional systems work
a comparator circuit will switch at precise voltages, so using ohm law you can see how the zone circuit works.introducing 470 ohms from a detector or call point will result in a reference of 8v...and O/c will result in a 28v ref, a n/c will result in a 0v...and a normal state will result in a 24v reference