5• This CO alarm can be used independently or interconnected up to 17 KiddeFyrnetics AC smoke, heat or CO alarms. i.e. 18 in total, as listed below.• Crossing line and neutral connections or line and interconnect connections willfatally damage all interconnected alarms invalidating the guarantee.• All interconnected alarms must be powered off the same fuse/circuit breaker.(See section 1)Total cable length between alarms must not exceed 250m (273yds) and be1.0mm in diameter, 3 core and earth (BS6243Y). Wiring must conform to the IEEregulations - BS7671, or latest edition.Interconnection:Interconnects directly with Kidde Fyrnetics:Ion Smoke Alarms: 123i - 123/9hi - 123/9hill - 1SF23/9hi - 1SF23/9hir - 1SF23/9hirePhoto Smoke Alarms: 223i - 223/9i - 223/9hi - 223/9ill - 223/9hill - 2SF23/9hi -- 2SF23/9hir - 2SF23/9hireHeat Alarms: 323/9hi - 323/9hill - 3SF23/9hi - 3SF23/9hirCarbon Monoxide Alarms: 423D/9hir - 423/9hir7. Interconnect WiringBlueWhite*BrownLine (Red)Neutral (Black)BlueWhite*Brown* Interconnect only – if single alarm installation, leave white unconnected .These are double insulated products and do not need earthing –never use earth conductor to interconnect – use 3 core and earth.House Cabling(Interconnect)*C ARBONM ONOXIDEA LARMParts permillion ofcarbonmonoxidedisplayedLb =Low batteryALARM4 FlashesSERVICE1 FlashPOWERINITIATINGALARMTEST/RESETPEAKLEVELONTWIS TOF F