super old alarm wiring stuck in my windowsill

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I am not very knowledgeable about electrical stuff (the most I have done is change out a light fixture), so apologies if I seem a bit paranoid.

I have two non-functioning alarm systems in my house. Both have magnetic sensors on my kitchen bay window, and I decided I was tired of looking at them as the plastic is getting yellow and in general they are ugly. The sensors for the newer one were easy to remove as they were wireless transmitters, it's just a matter of removing the adhesive now.

The problem is with the even older alarm system, which must be over 15 years old judging by the ochre color of the plastic housings. This system used wires strung through the house. I removed all the plastic parts but there are three sets of wires sticking up through (presumably puttied-in) my wooden window sill.

Is it ok to just cut these wires off flush to the window sill and cover it up with a bit of putty? Is there any reason I would need to worry about this wiring being dangerous?
 
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if the alarm system is completyely dead (IE powered down) there should be no problem in removing ALL of the cabling.

if you are going to remove the control panel, be careful as it still might be connected tot he electrical supply!!

if so

ISOLATE AND REMOVE THE CABLING CAREFULLY FROM THE FUSED SPUR!

Oasis
 
There might also be a back up battery in the control panel and that might still have some charge left in it if the panel has had mains power with in the past year or so. If there is any charge in the battery then when the wire is cut the battery fuse would (should) have blown.
 
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Thanks everyone.

There is only one box, associated with the newer alarm (which I myself cut the wires to 4 years ago in a moment of desperation as the damn siren would not go off).

I have to think the other wires have been dead even longer. So I'll be cutting 'em off today.
 

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