Because as I understand it that is what the British Standard says.If they should be replaced every 5 years regardless, and you can now buy them with 5 year built in batteries, why should they have to have mains supply.
Is just head in the sand stuff.
Apparently some LBC accept this.
But that standard was set before Detectors with 5 Year batteries were a available.Because as I understand it that is what the British Standard says.
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