Questions and Answers
What is the minimum cross-sectional area of each conductor in a two-core cable?
What is the requirement for conductors less than 1.0 mm² in a cable?
What is the requirement for cables used external to a building?
What is the requirement for cables having more than two cores?
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What is the requirement for wiring associated with the fire alarm system?
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What is the requirement for penetrations through fire or smoke separating elements?
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Study Notes
Cable Requirements for Fire Alarm Systems
- Cables used within a building for detector circuits, alerting devices, loudspeaker circuits, or ancillary control circuits must comply with either AS/NZS 5000.2 or AS/NZS 5000.3 standards.
- Cables must be sheathed in polyvinyl chloride or installed in conduit.
- Conductors can be stranded or solid core, but must be stranded if less than 1.0 mm² in cross-sectional area.
- Two-core cables require a minimum cross-sectional area of 0.75 mm² for each conductor.
- Cables with more than two cores require a minimum cross-sectional area of 0.5 mm² for each conductor.
Cable Use in External or Special Environments
- Cables used external to a building (overhead, underground in conduit, direct buried) or in areas of sustained sub-zero temperature must be of an appropriate alternative type.
- All wiring associated with the fire alarm system must comply with the requirements of the Electricity (Safety) Regulations for 230 volt systems.
- Penetrations through fire or smoke separating elements must be adequately sealed to maintain the fire resistance rating of the element or the integrity of the smoke separation.
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Description
This quiz covers the Australian standards for electrical cabling within buildings, including detector circuits and control circuits. It includes specifications for conductor materials and sizes.
