Fire Alarm Submittal Guides
NFPA 72 battery calcs, voltage drop, and AHJ submittal packages, based on 47 real approved permit jobs.
September 7, 2026 · 5 min read
The NFPA 72 Record of Completion Nobody Fills Out RightWhat actually goes in each NFPA 72 Record of Completion block, which signatures matter, and why one blank line can stall your certificate of occupancy.
September 3, 2026 · 5 min read
NFPA 25 SoftwareWhat NFPA 25 software actually needs to track: test frequencies, main drain trends, and impairment tags, so the AHJ report writes itself.
August 31, 2026 · 5 min read
Main Drain Tests: What the Numbers Mean and When to EscalateHow to read main drain gauge numbers against last year's test, tell a closed valve from a real supply problem, and what actually belongs on the ITM report.
August 27, 2026 · 5 min read
Fire Alarm Communicator Requirements After the POTS Line DiedPOTS is gone. Here's what AHJs actually want documented for cellular and dual path IP communicators, plus the panel compatibility trap that catches techs.
August 24, 2026 · 4 min read
Pull Station Mounting Height and Placement RulesPull station height, exit distance, and travel distance rules under NFPA 72 and ADA, plus the dual action question and why inspectors flag it so often.
August 20, 2026 · 6 min read
Smoke Detector Spacing: The Rules That Actually Get Enforced30 ft on center gets quoted a lot, but plan reviewers flag corridor width, beam pockets, and HVAC returns more. Here's what actually gets a comment letter.
August 17, 2026 · 5 min read
AHJ Registry: How to Find Out Who Actually Reviews Your JobThere is no master AHJ registry. Here is how to find the right reviewer, confirm the code edition, and build a jurisdiction sheet you reuse.
August 10, 2026 · 6 min read
Billing for Alarm Work: What to Invoice and WhenA fire alarm contractor's guide to progress billing, T&M service calls, recurring contracts, and retainage, so invoices actually get paid on time.
August 3, 2026 · 6 min read
Common Fire Alarm Plan Review Comments (and How to Answer Them)The plan review comments that keep coming back on fire alarm submittals, what each one actually means, and the fastest clean way to answer it.
July 28, 2026 · 6 min read
NFPA 72 Secondary Power: The 24-Hour Standby Rule ExplainedWhy NFPA 72 wants 24 hours of standby plus 5 minutes of alarm (15 for voice), how that feeds the battery calc, and when a generator fits instead.
July 24, 2026 · 4 min read
Deficiency or Impairment? NFPA 25's Three Tiers and the Chapter 15 ProcedureWhat separates a noncritical deficiency from a critical one from a full impairment under NFPA 25 — and the exact Chapter 15 steps required when a sprinkler system comes out of service.
July 24, 2026 · 4 min read
Quarterly NFPA 25 Sprinkler Inspection & Testing ScheduleNFPA 25 testing requirements for sprinkler systems: the quarterly inspection, annual check, and the 3-year and 5-year internal and standpipe tests.
July 23, 2026 · 6 min read
NFPA 10 Fire Extinguisher Inspection & Maintenance Schedule, ExplainedThe full NFPA 10 service schedule in one place: monthly inspections, annual maintenance, the 6-year internal exam, and hydrostatic testing at 5 or 12 years depending on the agent type.
July 23, 2026 · 4 min read
What NFPA 10 Actually Requires on a Fire Extinguisher Service TagThe service tag, the verification-of-service collar, the 6-year internal label, and the hydro test label — what each record must say under NFPA 10, and which service gets which.
July 23, 2026 · 4 min read
Fire Extinguisher Hydrostatic (Pressure) Test: 5 YearsFire extinguisher pressure (hydrostatic) testing: which agents hydro at 5 years vs 12, your test date and validity, and how it meets NFPA 10's 6-year exam.
July 20, 2026 · 5 min read
Fire Alarm Riser Diagrams: What Plan Reviewers Look ForWhat actually belongs on a fire alarm riser diagram, and why reviewers check it against your battery calc and device matrix before anything else.
July 13, 2026 · 6 min read
Building a Fire Alarm Device Matrix (With a Real Example)A walkthrough of a real device matrix: addresses, circuits, currents, and the annunciation and supervision columns a plan reviewer actually checks.
July 8, 2026 · 5 min read
Fire Alarm Cut Sheets: What AHJs Actually Want to SeeCut sheets sink more submittals than bad calcs do. Here's what AHJs actually want highlighted on the sheet, and the one mistake that gets it kicked back.
June 29, 2026 · 5 min read
Battery Calc Differences: Potter vs Fire-Lite vs Silent KnightHow Potter, Fire-Lite, and Silent Knight structure battery worksheets differently: where to find the numbers and how each handles the derating factor.
June 28, 2026 · 5 min read
Why AHJs Reject Fire Alarm Submittals (Top Reasons)Most AHJ rejections trace back to six fixable mistakes. Here's what's missing from your submittal package and how to fix each one fast.
June 26, 2026 · 5 min read
Sizing a NAC Circuit: Current Limits and Voltage DropHow to add up horn/strobe current draw, apply NAC de-rating, and know when voltage drop forces a circuit split or booster.
June 25, 2026 · 5 min read
Duct Smoke Detector Requirements Without the GuessworkCFM thresholds, sampling tube sizing, remote station placement, and the IMC vs NFPA 72 overlap that catches fire alarm techs off guard.
June 24, 2026 · 5 min read
Class A vs Class B Fire Alarm Wiring: When and WhyUnderstand the survivability difference between Class A and Class B fire alarm wiring, where AHJs actually require Class A, and the real cost tradeoff.
June 23, 2026 · 5 min read
Fire Alarm Candela and Strobe Spacing, ExplainedHow to read the NFPA 72 candela tables for wall and ceiling strobes, pick the right cd rating for a real room, and avoid the sync gotcha.
June 21, 2026 · 8 min read
NFPA 72 Battery Calculation: A Step-by-Step Walkthrough for Working ContractorsWalk through the 24-hour standby and 5-minute alarm battery calc from NFPA 72 using real numbers from a Potter panel swap, including the 1.2x derating factor.
June 21, 2026 · 8 min read
Fire Alarm Voltage Drop Calculation: The Real Numbers (and Why Most Submittals Show Zero)How the fire alarm voltage drop calc actually works, why the panel maker's form almost always shows zero, and when you really need real wire-run numbers.
June 21, 2026 · 10 min read
What Goes in a Fire Alarm AHJ Submittal Package? (Based on 47 Real Approved Jobs)A practical checklist of every component in approved fire alarm permit packages, with notes on which AHJs want each one, from 47 real completed jobs.