2 interruption of a light beam this system uses a

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2. Interruption of a Light Beam This system uses a photo-electric cell or the “electric eye” which operates on the principles of light rays.
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3. Electromagnetic Fence Is an electronic fence consisting of 3 to 5 strands of wire spaced from 9 to 24 inches above one another which serves as an antenna, a monitor panel, and electric circuitry. 4. Detection of Sound and Vibration This can be utilized effectively to safeguard enclosed areas vaults, safes, storage bins, file rooms, warehouses, and similar enclosures. 5. Space, Motion and Vibration These systems usually derive their operating principle from a physical phenomenon known as “Doppler Effect.”
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Locking Devices The most widely used method of controlling physical access is the lock. Locks are used on doors at home, on vehicles, for offices, hotels and safes, and in desks, cabinets, files, briefcases, display cases and jewelry boxes. Definition of Locks Locks are a simple type of detachable lock , with a hinged or sliding shackle designed to pass through a ring or staple on a door, chest, etc. Padlocks are used by consumers, commercial businesses, utilities, railroads & governments for various applications for the purpose of impeding theft, vandalism, sabotage espionage, or to protect people from harm.
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Types of Locks Available types of locks to physically control access to an area are the following: 1. Key-Operated Locks Key-operated locks are most frequently used and are simple to operate. A key is inserted into a keyway and turned to insert or4 withdraw a bolt from a strike. The keyway contains obstacles that must be bypassed to withdraw or insert the bolt.
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2. Combination Locks Combination locks are often used on padlocks as well as on safe and vault doors. Turning the dial to pre-specified numbers align the notches to create a slot, allowing an arm to drop into it so that the locking bar can be withdrawn from the strike. 3. Card-Operated Locks Card operated locks are inserted into a card reader installed near door or passageway that is restricted. When an authorized card is inserted into the slot, a minicomputer activates the locking device, thereby opening the door, traffic control arm, gate, or turnstile.
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4. Electronic Locks Electronic locks are frequently used in apartment buildings and in offices where strict physical security is required. For example, in an apartment building, the doorway between the foyer and hallways to the apartment can be electronically locked. 5. Other Locks In addition to the preceding types of locks, clam shell locks, such as those used in windows, bars, bolts, chains, and time locks can also be used to provide additional security .
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PART 4 SECURITY & SAFETY HAZARDS
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Before any security plans can be made, the existence or possibility of interference with the operational processes of the installation should be determined.
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