Specification for PVC insulated and sheathed cables for interconnecting wiring in intruder alarm systems.

British Standard BS4737-3.30:2015 was released on 28 February 2015 and covers cables used in security and alarm systems installed in the United Kingdom since 1 April 2016. This standard set out to address the issue of sub-standard cables in security systems, including burglar alarms, intercom and detector connection.

BS4737 identifies specification deviations, conductor metal content and materials. It also covers the measurement of conductor resistance and the use of compounds in fire performance versions.

Types of alarm cables:

  Type 1 Alarm Cable Type 2 Alarm Cable Type 3 Alarm Cable
Conductor Copper Copper Copper
Insulation Low Smoke Zero Halogen (LSZH) Polyvinyl Chloride (PVC) PVC
Outer Sheath LSZH PVC PVC
Maximum Resistance Value Conductor Resistance <100 ohms/km Conductor Resistance <100 ohms/km

Conductor Resistance <155 ohms/km

BS4737 details the requirements for clear labelling of the cable type, the resistance value, and the number of strands in the conductor to help ensure quality compliance and prevent failures in security systems. It can be viewed in conjunction with standard BS5839-1 for Fire Performance cables for fire alarm systems for buildings.

BS4737 cable compliance

Our portfolio of fire performance cables are subject to intensive quality and compliance testing in our ISO 17025 testing facility. Please contact our technical engineers to discuss your specific project requirements and for advice on ensuring full compliance with BS4737, including the selection of alarm cables from our fully compliant range.

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