# FireSpec Pro: Fire Alarm Calc — Battery, Voltage Drop, Spacing

> Battery, Voltage Drop, Spacing (iPhone/iPad app by Nguyen Pham.)

- Source: https://appshunter.io/ios/app/firespec-pro-fire-alarm-calc/id6820357003 (this page in markdown: same URL + `.md`)
- Developer: [Nguyen Pham](https://appshunter.io/developer/1594808704)
- Category: Utilities, Reference
- Price: Free
- Age rating: 4+
- Requires: iOS 13.0 · 48 MB
- Languages: American English
- Released: 2026-11-05
- Data updated: 2026-11-08

## What is FireSpec Pro?

FireSpec Pro is the pocket toolkit for fire alarm designers, installers and service technicians. Size standby batteries, check NAC voltage drop, lay out detectors and look up panel trouble codes – right on site, even with no signal.

BUILT FOR THE JOB SITE
• Works offline – calculations never need an internet connection
• NFPA 72 (US) and BS 5839-1 (UK) profiles
• Imperial (ft, AWG) or metric (m, mm²) units
• Big inputs, dark mode and a glove mode for gloved hands
• English and Vietnamese

CALCULATORS
• Standby battery – NFPA 72 or BS 5839-1 method, recommended battery size, panel maximum check and charger current
• NAC voltage drop – end-of-line or point-to-point, voltage at every device, maximum circuit length and wire size suggestion
• Detector spacing – smooth flat ceilings, with a layout grid
• Strobe & audibility – wall-mounted strobe candela and sound level check
• Utilities – Ohm's law, feet ⇄ metres
• Every result shows the formula and assumptions used

DEVICE LIBRARY
Standby and alarm currents, current-per-candela tables, EN 54-23 coverage and datasheet links for common detectors, modules, horns and strobes. Pick devices straight into the battery and voltage-drop calculators – quantities and candela settings included.

PANEL TROUBLE CODES
Type what the panel shows (for example GROUND FAULT) and get the meaning, likely causes and step-by-step checks. Supports popular panels such as Fire-Lite, Notifier, GST and Hochiki, and the library keeps growing. Rate a fix or suggest a missing code right from the app.

PROJECTS & REPORTS
• Save calculations into projects
• Professional PDF reports with your company logo, formulas, assumptions and signature
• Share a clean result image with one tap

FREE AND PRO
All calculators are free to use. Watch a short video to unlock a PDF export, point-to-point voltage drop, the charger check or full trouble-code details when you need them.
FireSpec Pro (monthly or yearly) removes ads and unlocks everything, including unlimited projects. Eligible new users can start with a free trial. Subscriptions renew automatically and can be cancelled anytime in Google Play.

IMPORTANT
FireSpec Pro is a reference tool. Always verify results against the codes adopted in your jurisdiction, the manufacturer's documentation and your approved design. FireSpec Pro is not affiliated with or endorsed by NFPA, BSI or any manufacturer; product names are trademarks of their respective owners.

Questions or ideas? info@359258.net

## Is FireSpec Pro safe?

Not enough ratings yet to assess FireSpec Pro.

## Is FireSpec Pro legit?

FireSpec Pro: Fire Alarm Calc appears legitimate, with a few gaps. The AppsHunter Legitimacy Score for FireSpec Pro is 70 out of 100 points across 7 verification signals from App Store and developer data.


## Version history (last 1 release)

### 1.0 — 2026-11-05

No release notes.

## More apps by Nguyen Pham

- [KBCheck](https://appshunter.io/ios/app/kbcheck/id1594808702)
- [CCTV VN](https://appshunter.io/ios/app/cctv-vn/id1612383749)
- [CCTV Reset Default](https://appshunter.io/ios/app/cctv-reset-default/id6478074575)
- [CCTV Stadium: Pickleball VAR](https://appshunter.io/ios/app/cctv-stadium-pickleball-var/id6753677398)
- [Viet Folk Games – Play on LAN](https://appshunter.io/ios/app/viet-folk-games-play-on-lan/id6805395073)

All apps by Nguyen Pham: https://appshunter.io/developer/1594808704

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-11-08.*