do you have turn turn power off to change battery on smoke alarm?

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nameisme

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do you have turn turn power off from the circuit breaker to change battery on a wired smoke alarm? If so why? is it to avoid electrocution when changing the back up battery? I know if you are changing the wired alarm which is connected to the house electric you have to turn power off from the circuit breaker but just to change the back up battery??

How do you know which is the breaker which is for the smoke alarms?
 
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The smoke alarm breaker should be marked, try the lighting circuit if not first.

You turn the power off because you might expose live connections whilst changing the battery , given it takes seconds to flick a breaker off its the sensible thing to do
 
What make are they as I can't say that I have ever had to turn the power off to replace the battery in a mains powered smoke detector. Furthermore, every one that I have installed has a cover for the terminals.
 
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I would have thought best as with any chargeable device, isolate power, replace battery, reinstate power.
That is what I would do to prevent possible damage to the charger circuit.
Pretty sure that is also what Fire alarm engineers etc, should do with there Larger wall mounted mains panels.
 
Thanks for all replies.

At 4am last night and 3 days ago a 4am again one or both, hard to know if it was just 1 or 2, went off for about 15 seconds.
Its not beeping or anything like that, no smoke, no moisture, nothing that I can see is around it.
can anyone tell me what it could be. Ive opened them up and doesnt seem to be any insects in there.
Only difference is that 4 days ago I plugged in a new extension lead for something unrelated. Could this be the cause of it?
 
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nameisme said:
Thanks for all replies.

At 4am last night and 3 days ago a 4am again one or both, hard to know if it was just 1 or 2, went off for about 15 seconds.
Its not beeping or anything like that, no smoke, no moisture, nothing that I can see is around it.
can anyone tell me what it could be. Ive opened them up and doesnt seem to be any insects in there.
Only difference is that 4 days ago I plugged in a new extension lead for something unrelated. Could this be the cause of it?
Click to expand...

Battery failing warnings are more often a single beep, repeated maybe every few minutes - so 15 seconds especially if all alarms fired, suggests they were triggered. Are there any kids in the house, who might have perhaps pressed the test button unknown to you?
 
Impossible to reach without ladders so nope. Everyone was sleeping.
What type of battery do you think it needs anyhow?

I wonder why it happened
 
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