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System Builder Quick Start

Real NFPA 72 Fire Alarm System Design

The System Builder provides production-ready calculations for installable fire alarm systems. All calculations follow NFPA 72 and NEC standards.

Step-by-Step Design Process

1. Enter Building Parameters

Total Area: Square footage of building
Stories: Number of floors
Occupancy: Business, Residential, Educational, etc.

2. Design System

Click "🎯 Design System" to calculate:

Number of smoke/heat detectors
Manual pull stations
Notification appliances
Coverage requirements

3. Calculate Wiring

Click "⚡ Calculate Wiring" to determine:

Circuit configurations
Wire sizes (AWG)
Voltage drop analysis
Conduit requirements

4. Generate Materials

Click "🧵 Generate Wire Spool" for:

Cable spool lists
Conduit specifications
Installation quantities
Procurement details

Example: 10,000 sq ft Business Occupancy

Input Parameters

Area: 10,000 sq ft
Stories: 1
Occupancy: Business

Calculated Results

Smoke Detectors: 12 (30 ft spacing)
Manual Stations: 3 (per NFPA 72)
Horns: 8 (15 ft spacing)
Total Current: 2.4 A
Battery: 55 Ah (24 hr backup)

Wiring Requirements

SLC Circuit: 16 AWG, 450 ft
NAC Circuit: 14 AWG, 300 ft
Conduit: 3/4" EMT

Compliance Verification

The system automatically ensures:

NFPA 72 device spacing
NEC wire sizing
UL listing requirements
AHJ approval considerations

Output Formats

Results include:

Device counts and locations
Electrical specifications
Material procurement lists
Installation procedures
Testing requirements

Professional Use

This tool generates designs suitable for:

Contractor bids
AHJ submissions
Installation planning
Code compliance documentation