Fire Alarm Design in AutoCAD and AutoCAD LT: What a Clean Workflow Looks Like

Name: Titan Fire Protection, LLC
Address: PO Box 488, Ivoryton, CT, 06442, US
Telephone: 860-322-9028

By Joseph Montuori, NICET Level IV

Most fire alarm drawings in this country are still drawn in plain AutoCAD or AutoCAD LT. That is not a bad thing. AutoCAD is what the architects send, what the reviewers open and what most designers already know. The trouble is that plain AutoCAD knows nothing about fire alarm, so every device, wire run, riser and calc sheet is something you build by hand.

I have been doing fire alarm design for 20 years, and I hold NICET Level IV. This post covers what a complete submittal set needs, where the drafting time actually goes and what a clean AutoCAD workflow looks like, whether you are on full AutoCAD or LT.

What a Fire Alarm Submittal Set Needs

Requirements vary by AHJ, but a complete set generally includes:

Cover sheet. Project information, code basis, applicable editions, system description and contacts.
Sheet index. Every sheet listed with its number and title, matching the title blocks.
Device legend and symbols. Symbols per NFPA 170, with a legend that matches what is actually on the plans.
Floor plans with device layout. Every initiating device, notification appliance, module and panel located on the architectural background, with addresses or circuit labels.
Riser diagram. How the panel, SLC, NACs, power supplies and communicators connect, floor by floor.
Sequence of operations or input/output matrix. What each input does to each output.
Battery calculations. Standby and alarm capacity with the safety margin from the adopted edition.
Voltage drop calculations. End-of-line voltage for each notification circuit.

Each of these sheets depends on the others. Move a horn strobe on the floor plan and the riser, the voltage drop calc and possibly the battery calc all change. That dependency is where most of the pain lives.

Where the Time Goes in Manual Drafting

If you draft fire alarm by hand in AutoCAD, these will sound familiar:

Spacing by eye. Laying out detectors without a reliable way to check coverage against NFPA 72 spacing.
Wiring by hand. Drawing every SLC and NAC run back to the panel, then labeling it.
Rebuilding the riser. Every layout change means redrawing or re-editing the riser to match.
Retyping the calcs. Counting devices off the plans and typing them into a spreadsheet for battery and voltage drop, then doing it again after each revision.
Sheet setup. Creating layouts, viewports and title blocks one sheet at a time.
Keeping the index straight. Renumbering sheets and updating the index by hand when a sheet gets added.
Keynotes. Placing and numbering notes manually, then reordering them after edits.

None of this is hard. It is repetitive, and repetitive work is where errors creep in: a device on the plan that never made it into the calc, or a sheet number in the index that no longer matches the title block.

What a Clean Workflow Looks Like

Start From a Template

A good template is the single biggest improvement you can make. It should carry your standard layers, text styles, dimension styles, blocks and title block, so every project starts the same way. When every job looks the same, mistakes stand out.

Consistent Layers, Blocks and Title Blocks

Keep a layer standard and stick to it: separate layers for devices, wiring, text, tags and background. Use blocks with attributes for devices so you can count and tag them reliably. Use one title block with attributes for the sheet number, title and revision, so the information lives in one place.

Keynotes Instead of Loose Text

Keynotes keep plans readable. A numbered tag on the plan tied to a note list on the sheet beats loose text scattered across the drawing, and it makes revisions cleaner.

Let the Layout Drive the Calcs

The ideal is that the floor plan is the source of truth. The riser, the matrix, the battery calc and the voltage drop calc should all come from what is actually drawn, not from a separate count.

Introducing CodeGreen CAD Tools

That last idea is why I started building CodeGreen CAD Tools.

Fire alarm design, done right inside AutoCAD.

Clean, lightweight, AutoCAD-native tools that run on the commands you already know.

Features

Detector spacing and SLC wiring. Lay out detectors to NFPA 72 spacing, then wire the loop back to the FACU.
Risers and sheets. Risers built from your layout, with sheets and viewports set up for you.
Matrix and calcs. The fire alarm matrix, plus battery and circuit calculations.
Automated templates. Layers, blocks and title blocks.
Sheet index and numbering. No sheet sets needed.
Keynotes. Without AutoCAD Architecture.

Compatibility

CodeGreen CAD Tools works with AutoCAD 2024 and newer, including AutoCAD LT 2024 and newer, on Windows. AutoCAD LT now supports AutoLISP, which makes this possible on LT. It is an add-in, not a separate program, so you stay in the AutoCAD environment you already use.

Status and How to Get It

CodeGreen CAD Tools is heading into a closed beta, coming soon. Get notified when the beta opens.

Sign on to the CodeGreen ITM inspection platform and get CodeGreen CAD Tools free of charge.

You can watch the demo video on YouTube and read more on the CodeGreen CAD Tools page.

The calcs and spacing rules behind a clean set are covered in these guides:

FAQ

Can you do fire alarm design in AutoCAD LT?

Yes. Many designers draft fire alarm plans in AutoCAD LT using templates, blocks and layers. AutoCAD LT now supports AutoLISP, so add-ins like CodeGreen CAD Tools can run in AutoCAD LT 2024 and newer on Windows.

What should a fire alarm submittal set include?

Typically a cover sheet, sheet index, device legend with NFPA 170 symbols, floor plans with device layout, riser diagram, sequence of operations or matrix, and battery and voltage drop calculations. Requirements vary by AHJ.

Is CodeGreen CAD Tools a separate program?

No. It is an add-in that runs inside AutoCAD 2024 and newer, including AutoCAD LT 2024 and newer, on Windows. A closed beta is coming soon.

Need the Drawings Done for You?

If you would rather hand off the drafting, Titan Fire Protection prepares NICET-prepared fire alarm drawings for projects nationwide, designed and prepared by Joseph Montuori, NICET Level IV, SET. Have a set that needs a check before it goes to the AHJ? Our flat-fee drawing review covers plans, specs and calcs. See our design process.

Request a quote or call 860-322-9028.