Willow Fire & Security returned to this property in Central London to carry out the replacement of a non compliant fuse spur and x2 failed batteries.
Following on from a 6 month service we found that the AOV panel spur was now non compliant and the batteries had failed due to passing the 4 year age.
We replaced all to keep site compliant and fully operational.
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A red key-operated fused spur is often used as a dedicated mains isolator for an AOV control panel.
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While not exclusive to BS 5839, the concept of isolation via a secure key switch is borrowed from fire alarm system practices, to:
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Prevent unauthorised power isolation.
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Ensure safe maintenance access.
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Provide a clear means of disconnection in emergencies.
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