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Why does the alarm sound when I switch off the electrical power supply?

I want to install some new lights. The lights are on the same cicuit as the alarm system. When I switch off the power completely or remove the fuse for that circuit the alarm goes off. This has not happened on previous occasions and I am puzzled as to why it should be happening now.
Peter Kirby, November 2010
mains voltage will hurt??? mike you are the master of understatement,try mains voltage wil kill

gts, November 2010
because your battery is dead - it needs changing- see other threads. Please remember that the mains voltage will hurt. if younsee other threads you will know what to do.
1 - locate battery
2 - change battery

mike, November 2010
I wonder why no one ever uses the SEARCH facility.

99.9% of all questions ever asked have been answered many many times before

acorn, November 2010
i will answer you,save acorn or the alarm guy having a fit,your battery is gone my friend,the one in your alarm system

gts, November 2010