Meady Posted July 13, 2022 Report Share Posted July 13, 2022 Please can anyone give us some advice? Grade D1/D2 alarms - do they have to be mains powered (with battery back up) or can they be 10-year, sealed, lithium battery powered only? BS5839-6 seems to suggest that they must be mains powered in some way with options for battery back-up depending on D1/D2. But can wireless radio-linked devices suffice as a suitable alternative in the guidance? Quote Link to comment Share on other sites More sharing options...
Harry Posted July 18, 2022 Report Share Posted July 18, 2022 Hi Meady here an overview of the BS5839-6 standard and the grades. D1/D2 can be interconnected with RF but power-supply has to be by mains power. Deviation from the mains power supply requirement would have to come from the specifier. BS5839-6 is a standard, not the law, so if it can be justified, deviations are allowed when specifying the grades for a property. Harry Quote Link to comment Share on other sites More sharing options...
AnthonyB Posted July 18, 2022 Report Share Posted July 18, 2022 On 13/07/2022 at 17:50, Meady said: Please can anyone give us some advice? Grade D1/D2 alarms - do they have to be mains powered (with battery back up) or can they be 10-year, sealed, lithium battery powered only? BS5839-6 seems to suggest that they must be mains powered in some way with options for battery back-up depending on D1/D2. But can wireless radio-linked devices suffice as a suitable alternative in the guidance? By definition a Grade D alarm is powered by a 240V supply, the 1 or 2 defining if the back up supply also required to each alarm is a sealed tamperproof battery/cell or a user replaceable battery. If you only have the built in power supply and no mains then it is only a grade F alarm (which can only be used in a rapidly decreasing number of situations) being a F1 or F2 again depending if the (sole) power is from a sealed tamperproof battery/cell or a user replaceable battery. Quote Link to comment Share on other sites More sharing options...
Meady Posted July 21, 2022 Author Report Share Posted July 21, 2022 On 18/07/2022 at 11:17, Harry said: Hi Meady here an overview of the BS5839-6 standard and the grades. D1/D2 can be interconnected with RF but power-supply has to be by mains power. Deviation from the mains power supply requirement would have to come from the specifier. BS5839-6 is a standard, not the law, so if it can be justified, deviations are allowed when specifying the grades for a property. Harry Hi Harry - thank you, that is a great help! ? Quote Link to comment Share on other sites More sharing options...
Meady Posted July 21, 2022 Author Report Share Posted July 21, 2022 On 18/07/2022 at 20:03, AnthonyB said: By definition a Grade D alarm is powered by a 240V supply, the 1 or 2 defining if the back up supply also required to each alarm is a sealed tamperproof battery/cell or a user replaceable battery. If you only have the built in power supply and no mains then it is only a grade F alarm (which can only be used in a rapidly decreasing number of situations) being a F1 or F2 again depending if the (sole) power is from a sealed tamperproof battery/cell or a user replaceable battery. Hi Anthony - thank you, I think you've made it clear that we need to be going along the 'D' route. The 'F' style alarms worry me due to the risk of people simply knocking them off the ceilings if they go off! Thanks as always for your advice - genuinely appreciated. Quote Link to comment Share on other sites More sharing options...
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