Fire alarm

[the pict]

Right got it and I have just realised there is 2 sounders on 1 circuit so it starts to make sense also it helps if you forget its an alarm and work as if it were just another circuit
Pict

 

[REIBURN]

hi all iv started working for a new company as an electrician but they have sent me to try and fault find on a commericail fire alarm. theres a fault on zone 3 but its intermittent. i have never done work on alarms before but the boss says that they are easy. iv been back 2 times and cant find the fault any ideas how to go about fault finding on an alarm system?

 

[tazz]

Presume this a convetional panel, intermittent faults can be a pain, but your looking for an o/c or a short to give zone fault 99% of the time its going to be o/c ie loose connect on device. 1. put the end of line unit back in zone to test the control no fault panel ok. 2. start test the voltage on each device on the incoming only ie L1 in and L2. should be 24-27v. 3 check connections on that device. then replace and move on to next. 4. continue intill you find a device with no voltage. This is now the point were there is and o/c from the last device you tested to this one. So now you have a location check devices again, check for junction boxes, and cable damage. Hope this helps