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Do-It-Yourself (DIY) Question & Answer Forum
Cpc As Interlink On Smoke Alarm Circuit....what Would You Do?
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<blockquote data-quote="SPECIAL LOCATION" data-source="post: 321354" data-attributes="member: 250"><p>A vast majority of 230v smokes have battery back-up either standard 9v or a lithium pack of some sort...</p><p></p><p>As Wozz points out if the interlink signal is able to operate while the smokes are in battery back up mode..</p><p></p><p>Then the interlink cannot be a 230v signal...</p><p></p><p>If the interlkink is only a mains operation feature then could be 230v..</p><p></p><p>but that rather defeats the object of having mains power-battery-back-up IMHO!!!</p><p></p><p>If we go down the line of manufactures instructions I know Aico specifically show using 3core&amp;E for hard wired interconnected devices..</p><p></p><p>and IIRC their units have a place to terminate the CPC to continue the earth through even though they are DI units.</p><p></p><p>Either way if it is 230v AC or a 9v DC signal..</p><p></p><p>The conductor it travels down should be insulated along its length as either </p><p></p><p>a) if at 230v it is a live part and must be insulated or out of reach etc... 416.x.x</p><p></p><p>b) if at 9v (or similar) it is mixed voltages in the same cable and conductors should be insulated to the level of the highest voltage present! 528.1 (ii)</p><p></p><p>So I would make the CPC back to become a CPC and leave the smoke as standalone units..</p><p></p><p>give the customer a quote for....</p><p></p><p>(i) providing new hard wire interconnection</p><p></p><p>(ii) or radio link units...</p><p></p><p>(iii) or loads more standalone lithium battery units (bit like what the fire brigade fit in old dears houses.. I think for free!!)</p><p></p><p>There are Zillions of houses without interlinked alarms..</p><p></p><p>Better have wiring that complies with BS7671 and standalone than not at all !</p></blockquote><p></p>
[QUOTE="SPECIAL LOCATION, post: 321354, member: 250"] A vast majority of 230v smokes have battery back-up either standard 9v or a lithium pack of some sort... As Wozz points out if the interlink signal is able to operate while the smokes are in battery back up mode.. Then the interlink cannot be a 230v signal... If the interlkink is only a mains operation feature then could be 230v.. but that rather defeats the object of having mains power-battery-back-up IMHO!!! If we go down the line of manufactures instructions I know Aico specifically show using 3core&E for hard wired interconnected devices.. and IIRC their units have a place to terminate the CPC to continue the earth through even though they are DI units. Either way if it is 230v AC or a 9v DC signal.. The conductor it travels down should be insulated along its length as either a) if at 230v it is a live part and must be insulated or out of reach etc... 416.x.x b) if at 9v (or similar) it is mixed voltages in the same cable and conductors should be insulated to the level of the highest voltage present! 528.1 (ii) So I would make the CPC back to become a CPC and leave the smoke as standalone units.. give the customer a quote for.... (i) providing new hard wire interconnection (ii) or radio link units... (iii) or loads more standalone lithium battery units (bit like what the fire brigade fit in old dears houses.. I think for free!!) There are Zillions of houses without interlinked alarms.. Better have wiring that complies with BS7671 and standalone than not at all ! [/QUOTE]
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Cpc As Interlink On Smoke Alarm Circuit....what Would You Do?
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