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⭐Crime Central Station Burglary Alarm Systems
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1 Page 1 of 10 Scope Crime Central Station Burglary Alarm Systems This criteria is intended to provide Loss Control Representatives with specific guidelines and information for evaluating central station burglar alarm systems for risks carrying crime coverage. Table of Contents PAGE Central Station Information 2 A. Grade 2 B. Extent 3 C. Armed Guard Response 4 D. Alarm Transmittal Methods: 4 E. Line Security / Line Supervision 5 UL Certificate-Sample 6 F. Local Alarms 7 G. Sensing Devices, Comparison of: 7 1. Contacts, Foil, Open Wiring, Screens and Grooved Stripping 7 2. Photoelectric Beams 7 3. Sonic & Vibration Detectors 7 4. Microwave 8 5. Ultrasonic 8 6. Infrared Motion 8 7. Field: Proximity, Electrostatic, Capacitance 8 8. Sound Detection 9 9. Vibration Detection 92 Page 2 of 10 I: Central Station (CS) Information Refer to the Central Station Alarm Association (CSAA) "An Insurance Guide to Selecting a Burglar Alarm System" for additional information on central stations and an explanation of crime terminology. Definition: A fire-resistive or automatic sprinkler protected building or office facility capable of receiving, monitoring and dispatching appropriate help for burglary and theft and/or fire conditions. Access to the premises of the CS is highly restricted. An UPS (Uninterrupted Power Source) consisting of either batteries, a natural gas or a gasoline engine-driven generator is one of the requirements. The UPS should have sufficient total capacity to power the Central Station for at least 24 hours under normal load. Central Station Premises protection is available in grades: A, B, C, AA, BB and CC. A white "Certificate of UL listing" is issued by the Central Station for those systems fulfilling the necessary requirements. The certificate provides the following information: (Page 6 for sample) Name of Central Station Grade and Installation # (Extent) Certificate # and Expiration date When a signal is received at a Central Station a telephone call is made to the local police (same as Extent for the area) where the burglary is attempted. In addition, when contracted for, a guard is dispatched from the Central Station to their subscribers premises. The following are Central Station explanations: A. Grade B. Extent C. Armed Guard Response D. Alarm Transmittal Methods E. Line Security / Line Supervision F. Local Alarms G. Comparison of Sensing Devices A. Grade: "UL certified" grades indicate primarily the response time required for the Central Station alarm investigators to reach the subscriber premises following receipt of the alarm, and the method used to transmit the signal: GRADE A: Time required to reach the risk from receipt of the alarm should not exceed 15 minutes. GRADE B: Time required is 20 minutes. GRADE C: Time required is 30 minutes. GRADES AA, BB, CC: Same guard time response, as A, B, or C. However, the line over which the signals are transmitted is supervised in the event of wire cutting or electrical jumping. This is called LINE SECURITY.3 Page 3 of 10 B. Extent: Extent of protection is determined by the protection of accessible openings and the use of interior protection devices. UL definitions of Extents 1, 2 or 3 (installations) are as follows: EXTENT # I EXTENT # 2 EXTENT # 3 a. All points of entrance plus floors, walls and show windows. b. Completely protecting all windows, doors, transoms, skylights, and other openings leading from the premises and all ceilings, floors and halls, party and partition walls, and building walls enclosing the premises, except building walls which are exposed to street or public highway and except that part of any building wall which is at least two stories above the roof of an adjoining building. a. All accessible points of entrance plus floors and party walls. Completely protecting all accessible windows (except stationary show/plate glass windows), doors, transoms, skylights, and all other openings leading from the premises; with contacts only, all non masonry walls and all hall, party and partition walls enclosing the premises or b. All accessible points of entrance except show windows and excluding walls, floors, party walls; plus interior space (motion). Protecting with contacts only all movable openings leading from the premises and providing a system of invisible radiation to all sections of the enclosed area so as to detect four-step movement when steps are taken at a rate not less than one step per second or c. All accessible points of entrance plus interior paths. Completely protecting all accessible windows (except stationary show windows), doors, transoms, skylights, and other openings leading from the premises; with contacts only, all inaccessible windows; and providing a network of invisible beams to subdivide the floor space of each floor or separate section of protected area into three or more approximately equal areas, where necessary to provide at least one subdivision per 1,000 sq. ft. (100 sq. meters) of floor space. When Concentration rates "Yes", the beam arrangement should provide spanning the entire front of the wall, in addition to accomplishing the required subdivisions. The requirement for subdivision and alteration rooms, furnace and coal rooms, basements, and other portions of the premises where valuables are not stored. a. Complete protection of accessible openings, completely protecting all accessible windows (except stationary show windows) doors, transoms, skylights, and other openings leading from the premises. or4 Page 4 of 10 b. Partial protection of accessible openings plus limited beams or motion. Protecting with contacts only all accessible openings leading from the premises and providing one or more invisible rays or channels or radiation with the minimum overall length of the rays or radiation equivalent to the longest dimensions of the area(s) to detect movement through the channel when a person crosses each channel at any point at the rate of one step per second. or c. Partial protection of doors and complete space protection (motion). Protecting with contacts only, all doors leading from the premises and providing a system of invisible radiation to all sections of the enclosed area so as to detect four-step movement when steps are taken not less than one per second. C. Central Station Armed Guard Response There are two types of guard responses: 1. With keys to the risk (Alarms from KEY installation require complete search of the premises and adjacent locations' if accessible). 2. Without keys to the risk (Alarms from "No Key" installations require complete exterior search of the premises). Generally "No Key" installations are preferable to "Key" installations. D. Central Station Alarm Transmittal Methods There are 4 types of Central Station Transmittal Methods: 1. Multiplex System: a) Closed window system: A group of alarm subscribers are sharing one signal Communication is between a microcomputer at risk and the computer at the Central Station over a high quality private phone connection : greater reliability, easier location of trouble spots, reduced costs b) Open window systems: Alarm systems are connected to the shared line in a party line arrangement. Line costs are shared, however, the system is subject to electronic noise either from a malfunction or from a deliberate jamming attempt. Also, the one phone line transmits a lot of information that makes it difficult to find a problem spot.5 Page 5 of Direct Wire Systems One of the oldest methods of alarm transmittal. Uses a copper wire to connect each customer separately to the Central Station. Problems in the line are easily recognizable. are high cost, limited types of signals that can be transmitted and lack of distinction between failure of the phone line and an actual alarm. 3. Digital Communicator System Less expensive as it uses the risk's existing telephone line, and can also function well for long distances. Capable of transmitting different type alarms similar to multiplex. It is not as reliable since the Central Station monitors ft only when a signal is sent by the risk. It may be programmed to advise the Central Station periodically of their line integrity. Other systems use two separate phone lines for improved reliability. 4. McCulloh System It s a party line arrangement of up to 15 alarm systems all using copper wires. Alarm messages are sent telegraph style and are received on strips of paper in codes. include: a. Simultaneous alarm signals could send confusing codes. b. Operator interpretation is required (chance of error) c. Phone line problems might be difficult to locate and correct. d. Dedicated copper wires are becoming obsolete and therefore expensive and even unavailable. E. Line Security/Line Supervision Line Security is the protection provided to the transmittal lines to ensure that prospective, sophisticated burglars do not compromise, interfere or attempt to substitute the communication channels by shunting, jumping out the telephone lines or substituting alarm equipment. Line supervision is done by data encryption, random tone patterns, and other methods that are very difficult if not impossible to duplicate. Line security is a superior form of detecting attempted interference than line supervision. Line Supervision is a simple means of detecting transmittal lines that are "down" by showing a trouble signal at the Central Station. The normal mode of detection is generally line resistance to see if the circuit is open or closed; or a more sophisticated method superimposes a tone or an ac voltage on the line, which monitors any tone or voltage changes.6 Page 6 of 107 Page 7 of 10 F: Local Alarms A local alarm is one that sounds a loud, audible signal such as horn, local bell or siren. A local alarm could be UL listed or not. A UL listed local alarm has to meet UL qualifications as to duration, mode of actuation, accessibility and exposure to vandalism. An ordinary local bell (not necessarily UL listed) is advisable on all Central Station supervised alarms to serve as a deterrent to most burglars. G: Comparison of Sensitive Devices A sensing device is a particular means of detecting intrusion. There are basically two categories of devices: Devices that monitor perimeter protection (such as 1. below), and devices that monitor area such as motion and sound detection. (See 2. to 9. Below for the comparison of sensing devices). 1. CONTACTS - FOIL - OPEN WIRING - SCREENS - GROOVED STRIPPING Major Uses: Protection at accessible openings (see definition) Simple Easily compromised Trouble free Will not detect "stay behinds" Low cost Needs maintenance often 2. PHOTOELECTRIC BEAMS Major Uses: Perimeter or area protection can be a single beam or stacked arrangement providing a vertical barrier Covers open areas where physical obstructions Beams can be located and defeated cannot be tolerated Detects "stay behinds" Susceptible to misalignment Can activate other security devices such as Dusty or smoky atmospheres may cause false cameras, microphones, etc. alarms Covers large ranges, of up to ft. 3. SONIC AND VIBRATION DETECTORS Major Uses: As a sensing device on any surface to which it is attached for either yard or area protection Can be extremely sensitive for specialized Cannot be used in areas of high vibration8 Page 8 of 10 Applications such as vaults 4. MICROWAVE Difficult to defeat unless exact location is known Major Uses: Similar to ultrasonic, except that range and sensitivity are considerably greater. Same advantages as ultrasonic Not affected by air currents Penetrates solids Equipment is compact & easily installed False alarms can be caused by other radio transmitters operating at a similar frequency Not prone to false alarms from air currents Not suitable for use in metal buildings Building movement is sensed as an alarm 5. ULTRASONIC Major Uses: Area protection. Saturates area with a pattern of high frequency sound waves, the intruder disrupts the wave pattern and triggers alarm Detects "stay behinds" Does not penetrate solids Flexible interior coverage May not detect slow movements Difficult for intruders to detect Can be subject to false alarms Cannot be used in high sound absorbing areas Cannot be used in areas subject to excessive vibration from mechanical equipment or excessive air turbulence 6. INFRARED MOTION DETECTION (Passive infrared) Major Uses: Area protection, detects body heat and transmits alarms. Excellent for confined areas Not subject to false alarms from movement of Subject to false alarms from hot metallic surfaces non living things or from the sun Not affected by air in motion, sounds, vibration, Subject to false alarms from rodents, however electrical or radio disturbances, or changes in viewing pattern can be adjusted to start a few level feet above the floor to avoid this problem Will not penetrate glass or solids Covers fairly large area 7. FIELD (Proximity, Electrostatic, Capacitance) Major Uses: Suitable for Perimeter protection. Current carrying field wires and separate sensing devices may be installed along a fence9 Page 9 of 10 Capable of detecting burglar prior to intrusion 8. SOUND DETECTION Only metal objects separated from ground can be monitored Major Uses: Area protection. Audible sound picked up by microphones in the protected, covered area Covers large volumes Susceptible to outside noises Inexpensive installation Can be defeated by knowledgeable intruder Can use existing intercom or speaker system as Subject to human error microphones Local alarms cannot be easily provided. Failure of one microphone is not easily detectable Insensitive to areas with high ambient noise level. Notification of police or guards is not automatic 9. VIBRATION DETECTION (Seismic) Major Uses: Safes, vaults. Highly sensitive piezoelectric crystal or microphone detects hammer like impact on rigid surfaces and generates alarms. Can also be mounted on fences for yard protection Versatile, highly adjustable Will not detect "stay-behinds" if they keep away from fence, wall, etc. being monitored Similar documents
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