jmsa7 Posted September 19, 2011 Share Posted September 19, 2011 In an addressable fire alarm system, in the loop wiring, a green/yellow wire(some people call it ground, other earth) is used. Why is it used. What's its role in the electrical circuit? Thx Link to comment https://www.thesecurityinstaller.co.uk/community/topic/32081-stupid-question/ Share on other sites More sharing options...
MrHappy Posted September 19, 2011 Share Posted September 19, 2011 screen + fault use Mr Veritas God Link to comment https://www.thesecurityinstaller.co.uk/community/topic/32081-stupid-question/#findComment-277366 Share on other sites More sharing options...
jmsa7 Posted September 20, 2011 Author Share Posted September 20, 2011 screen + fault use Could you elaborate on that, with some real life examples please? So I can once and for all understand the usage of this wire.... Thank you. Link to comment https://www.thesecurityinstaller.co.uk/community/topic/32081-stupid-question/#findComment-277375 Share on other sites More sharing options...
9651 Posted September 21, 2011 Share Posted September 21, 2011 its a drain wire, not an earth Link to comment https://www.thesecurityinstaller.co.uk/community/topic/32081-stupid-question/#findComment-277397 Share on other sites More sharing options...
james.wilson Posted September 28, 2011 Share Posted September 28, 2011 As above its not an protective earth and must not be grounded anywhere on the circuit except one end (usually) of the loop back at the panel. Its purpose is to dump to earth all the noise the screen areound the fire cables collect to help stop interference affecting the data on the loop. It runs at low voltage (24-48v) securitywarehouse Security Supplies from Security Warehouse Trade Members please contact us for your TSI vetted trade discount. Link to comment https://www.thesecurityinstaller.co.uk/community/topic/32081-stupid-question/#findComment-277540 Share on other sites More sharing options...
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