Generator Installation Guide

Install generators safely and to code with this comprehensive guide covering NEC 702, 445, and 250 requirements, installation steps, and testing protocols for single-phase residential systems up to 20 kW.

Code Reference (NEC)

• NEC 702 – Optional Standby Systems
• NEC 445 – Generators
• NEC 250 – Grounding and bonding
• NEC 110.20 – Transfer equipment ratings

Generator Requirements

1. Single-phase residential generators
2. Compatible start/stop control (if auto-start)
3. Proper grounding and neutral configuration
4. ≤ 20 kW

Installation Steps

1. Install generator breaker in designated slot
2. Land L1, L2, Neutral, Ground on designated terminals
3. Install generator CTs if required
4. Connect auto-start wiring if applicable
5. Keep auto-start wiring isolated from HV conductors

Testing

• Simulate outage
• Confirm generator start and load acceptance
• Verify priority circuits behave correctly