Croxley Alarms Systems Ltd

Monitoring Information



In order to be eligible for a URN for police response , the current ACPO police policy requires all new alarm installations to be capable of providing confirmation of the alarm condition .

A sequentially confirmed alarm is one which results from the activation of two or more independent detectors .These must be configured so that the activation means that there is a high probability that a genuine intrusion or attempted intrusion has occurred . The second activation must occur within a fixed period of first event , known as confirmation time .

Confirmation time for this system will be 30 minutes unless otherwise agreed .

Activation of a single detector will generate an unconfirmed alarm and at this stage only the keyholders will be informed .

Activation of a second detector , within confirmation time , will generate a confirmed alarm and both the Police and Keyholders will be informed.

If a second activation does not occur within confirmation time , the system will reinstate itself.

If a detector is in alarm at the time of reinstatement , it will be inhibited to prevent a further alarm being generated . A signal will be sent to the Alarm Receiving Centre to indicate that detector inhibition has occurred and the keyholder will be informed . The action to be taken on receipt of this signal may need to be clarified by the customer with their insurers as it may not be acceptable to them for a detector to be left inhibited .
Should a further activation occur after reinstatement , this will generate a further unconfirmed alarm , requiring a further independent activation within the confirmation time to generate a confirmed alarm .


There are various approved methods of unsetting the system but Croxley Alarm Systems Ltd will usually us one of the following three options unless the site particularly requires a further option.
1. The system will be unset by means of a user code following the opening of the entry door . (DD243:6.4.4)
Opening the entry door will disable all means of confirmation and will start the entry timer , unsetting is completed by means of the user code .
NOTE . Your attention is drawn to the fact that by allowing this means of unsetting , if an intruder succeeds in forcing the initial entry door , the police will not be called regardless of the intruders further progress through the supervised premises. This means of unsetting the intruder alarm might be unacceptable to your insurers .
2. The system will be unset by means of a PACE (swipe card , proximity device ,etc) once the entry door has been opened . (DD243:6.4.5)
Opening the door starts the entry timer and will inhibit confirmation,the system is then unset by means of the portable device . Once the entry timer expires the means of confirmation are restored.
If the remote device fails it will be possible to complete the unsetting by means of a user code , but only after the entry time has expired .
3.The system will be unset by means of a PACE (swipe card , proximity device etc.) from outside the supervised premises .(DD243:6.4.5)
Operation/presentation of the remote device will cause the system to be unset prior to the entry door being opened . Should the system fail to unset , for any reason , prior to the entry door being opened , the entry timer will start and the unsetting can then be completed by the means of the remote device from the second reader inside the supervised premises.
Croxley Alarm Systems recommend that one of the following types of notification will be suitable as suggested on your quotation.
1 . Digital Communicator . This will transmit alarm information to an Alarm Receiving Centre . If a fault develops on the telephone line or if the line is cut or disabled then no further information is sent. The ARC will monitor the system for a test call every 24 hours . If a communication is not received within the required time frame the keyholders will be notified .
NOTE . If this means of notification is chosen your attention is drawn to the fact that failure or compromise of single path signalling cannot be passed to the police . While failure persists , subsequent alarms cannot be signalled to the ARC and passed to the police.
2. Dualcom or Emizon 21 . These are both dual path signalling using either a telephone line / broadband as one signalling path and a mobile network as the other signalling path . Failure of a single path is is reported to the ARC as an ATS path fail, with the second path still being available to transmit alarm information.
Failure of both paths , within 96 hours , will result in the ARC contacting the police.

NOTE . There are other means of notification and Croxley Alarm Systems Ltd will be pleased to quote for others upon request.


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