In response to the latest amalgamations of British and European Electrical Wiring Regulations: An Illustrated Explanation of Automatic Disconnection of Supply uses simplified illustrations, to explain how the Automatic Disconnection of Power Supplies to Electrical and Fire Alarm Circuits (or parts there of), should be used to protect the cabling of various circuit configurations from short circuit or overload, in order to create safe and efficient Electrical and Fire Alarm Systems.