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I will prepare fire alarm battery calculations per nfpa 72
About this Gig
Need fire alarm battery calculations for your permit submission?
I prepare accurate secondary power calculations per NFPA 72, with correctly sized batteries and power supplies for your panel.
What you receive:
- Standby and alarm battery calculations (24 hours plus 5 minutes, or 15 minutes for voice systems)
- Amp-hour sizing for the control panel and NAC power supplies
- Horn strobe, speaker, and detector load tabulation
- NAC voltage drop check
- Support for most major fire alarm panels
- Clear PDF calculation sheet, ready to attach to your permit set
Why order:
- Easy-to-verify format for plan reviewers
- Fast turnaround
- Help resolving undersized battery comments
To begin, send your panel model, device list or counts, and notification appliance candela ratings. Message me to confirm your scope.
Building type:
Residential
•
Commercial
•
Office & workspace
Software:
AutoCAD
•
Revit MEP
•
SprinkCAD
•
HydraCAD
•
AlarmCAD
Delivery style preference
Please inform the freelancer of any preferences or concerns regarding the use of AI tools in the completion and/or delivery of your order.
Other Building Engineering Services I Offer
FAQ
What do I need to send?
The panel model, a device list with counts, notification appliance candela and current ratings, and the number of NAC circuits. A floor plan or riser helps for voltage drop.
What durations do you use?
Standard NFPA 72 criteria: 24 hours of standby plus 5 minutes of alarm, or 15 minutes of alarm for emergency voice systems. Tell me if your reviewer requires a different safety factor.
My battery calculation was rejected. Can you fix it?
Yes. Send the reviewer’s comment and your original calculation, and I will correct it and resize the batteries or power supplies.
Will my reviewer accept it?
The calculations follow NFPA 72 and the manufacturer’s listed current draws. Share your adopted code edition and any local requirements and I will include them.
