Could anyone cite me the exact law and perhaps the reasoning behind it?
Entirely dependent on application. Supply lines can incorporate unlimited bends and fittings. Waste piping shouldn't vary by more than 1/8 per foot. Provide context.
those 3 sharp beats mean the batterly is low, the 9volt batter can last a while on those fire alarms but try changing the batter. and the fuse is the apartments responsibility. any thing major where you need to call a repair man out should be at the apartments expense. its a liabilty thing.
