ASD ISM 1639 Label building management cables clearly
What it says
Building management cables are labelled with their purpose in black writing on a yellow background, with a minimum size of 2.5 cm x 1 cm, and attached at five-metre intervals.
Quoted as published. Everything else on this page is written by Control Stack.
What it means
In plain EnglishLabel cables with purpose clearly at intervals to ensure easy identification.
This control is about clearly labelling the cables used for managing building systems like heating or security. By doing this, people can easily identify what each cable is for, which makes maintenance easier and avoids confusion or mistakes that could disrupt building operations.
Free. Save your status, tasks and notes.
Why it matters
Poorly labelled building management cables can lead to maintenance errors, misconfigurations and critical system downtime affecting operations.
How to implement
The building manager should ensure that all building management cables are clearly labelled.
They should organise for labels in black writing on a yellow background, ensuring they measure at least 2.5 cm by 1 cm. Have the handyman or a professional install these labels at regular five-metre intervals along each cable.
The facility maintenance team should regularly check that all cable labels are intact and legible.
They can do this by conducting a visual inspection every six months, ensuring labels haven't faded or fallen off due to dust or moisture.
The IT manager should coordinate with the building maintenance team to ensure each cable's purpose is clearly described on the label.
This involves listing the systems that the cables connect to, so that if there's a problem, repairs can be quickly targeted.
Procurement should ensure their suppliers provide labelling materials that adhere to the specified standards.
They can do this by detailing these requirements in purchase orders and contracts, verifying with labels already in use.
The facility's electrician or IT technician should install the labels, as they are familiar with the cabling layout.
They should use appropriate tools and de-clutter surroundings while ensuring they do not accidentally damage the cables or interfere with building systems.
Keep it running
Inspect building management cable labels for readability; replace faded tags and ensure black-on-yellow labels are at least 2.5 cm x 1 cm and attached every five metres.
Evidence and audit
- Check 1 of 5What an auditor asks for
Ask for
The maintenance log: Request the document where regular cable label checks are recorded.
Look at
The log for dates and outcomes of each inspection. Good records will show consistent intervals, findings, and any corrective actions taken.
- Check 2 of 5What an auditor asks for
Ask for
A sample set of cables: During a site inspection, identify a few building management cables.
Look at
The spacing of labels and their clarity. Good labelling will be clear and present at every five metres.
- Check 3 of 5What an auditor asks for
Ask for
Procurement files: Request documentation of purchases and specifications for labelling products.
Look at
References to label size, colour requirements, and quantity of labels provided. Good evidence would include clear adherence to the size and colour standards specified.
- Check 4 of 5What an auditor asks for
Ask for
Building management system plans: Review diagrams or plans showing cable routing and labelling points.
Look at
How labels are placed in relation to the whole system's functioning.
Good evidence
Plan will show structured, logical placement supporting easy identification.
- Check 5 of 5What an auditor asks for
Ask for
To speak with facility maintenance: Request feedback on the labelling process and materials used.
Look at
Alignment between their description and the standards outlined in this control. Good conformance would include correct descriptions and employees confirming regular checks.
Mappings
Closest match in ISO/IEC 27001: A.7.12, Secure cabling for power and data, which partially overlaps with this control.
ISO/IEC 27001: 1 mapping
This control partially overlaps A.7.12.
Annex A 7.12 requires protection of cabling from interference or damage and seeks to reduce opportunities for unauthorised interaction with cable infrastructure. ISM-1639 requires building management cables to be clearly labelled at defined intervals, improving identification and maintenance handling, which can reduce accidental damage and misconnections. ISM-1639 is limited to building management cabling and focuses on identification rather than broader interception/tamper protections expected under Annex A 7.12.
Mappings show how controls relate across frameworks. They do not imply full equivalence or certification.