System Layout Drawings

What is a System Layout Drawing?

When installing or modifying a fire alarm system, as part of the document process, A system layout drawing
(or As-Fitted drawing) must be provided to the premises manager.

The actual routes of cables must be added.  A simple schematic showing just the order in which devices are connected is not sufficient to comply with the recommendations. Likewise, for addressable systems, adding a note
just stating wiring is in address number order does not meet the recommendations.


The actual routes must be adhered to as much as possible, whilst also showing the order in which devices are connected.  Where multiple cables run together, it is acceptable to show these separately and with enough space to be able to identify separate cables on the drawing.

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What is Included?

These drawings should include:

  • The positions of all control, indicating and power supply equipment. The positions of all the fire alarm control panels, repeater panels, and all associated power supplies.

  • The positions of all manual call points, fire detectors and fire alarm devices. We use a different symbol for each type of device; including a key or legend, detailing what each of the symbols is.  

  • The positions of all equipment that might require routine attention or replacement (e.g. short circuit isolators and remote indicators).

  • The type, sizes and actual routes of cables - We add a note to all your drawings detailing the cable type and size.

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What we Do

We complete your drawings knowing that the purpose of accurate wiring routes is to enable a competent person to be able to locate the cable in the event of a fault or the need to modify/extend the installed system.


DON’T FORGET:  Should a system be extended; the existing as fitted drawings should be updated to reflect the changes/additions too!

Next Steps

Whether you need drawings for your tender, working drawings to help with the management of the project, or As Installed drawings to complete your project - QDOS can help. Simply email images of your marked-up plans to or post the more complex ones and let QDOS do the rest! 

To read our guide for As Fitted Drawings, view our article here.