Generator Systems Plan Review & Inspection

At Texas Power Inspections (TPI), we provide complete combined plan review and inspection services for standby and backup generator systems throughout Texas. Under SB 1202 and SB 1252, contractors and homeowners can now choose third-party plan review and inspection to accelerate project approval while maintaining the highest level of code compliance and safety.

TPI ensures every generator installation is designed and installed according to the National Electrical Code (NEC Article 702), International Residential Code (IRC), and manufacturer requirements — guaranteeing a safe, reliable, and legally compliant backup power system.

What We Review

TPI’s generator plan reviews evaluate every aspect of the electrical and structural design to verify safety, performance, and compliance before installation begins.

During plan review, we verify the following:

  • Site plan and placement: Confirm generator location, pad layout, clearances from structures, property lines, doors, and windows per IRC R331.2 and manufacturer guidelines.

  • Electrical one-line diagram: Review conductor sizes, conduit paths, disconnect locations, breaker ratings, grounding, and bonding per NEC 702.4–702.12.

  • Transfer switch configuration: Ensure correct type (manual or automatic), interlock method, and neutral isolation.

  • Overcurrent and disconnect protection: Confirm properly sized main breakers, service disconnects, and emergency shutoffs located at the service point.

  • Fuel system coordination: Verify fuel type (natural gas, propane, or diesel), supply line size, and mechanical code compliance for venting and pressure ratings.

  • Labeling and signage: Review proposed labeling for disconnects, standby sources, and emergency power systems per NEC 702.7.

  • Interconnection details: Confirm safe tie-in method to existing service equipment — supply-side or load-side — and that it complies with NEC 705 when interconnected with solar or ESS.

  • Manufacturer documentation: Review all cut sheets for the generator, transfer switch, and control system verifying listing and labeling by a Nationally Recognized Testing Laboratory (NRTL) such as UL or CSA.

  • Load calculations: Ensure the generator’s capacity meets or exceeds critical circuit demand, calculated per NEC 220.

What We Inspect

After plan approval, TPI conducts a full inspection to ensure the generator system is installed exactly as designed and meets all local and state code requirements.

During inspection, we verify:

  • Generator placement and pad: Proper clearances, elevation, and anchoring.

  • Electrical connections: Conduit sizing, conductor terminations, and weatherproof fittings.

  • Grounding and bonding: Proper electrode system, bonding jumpers, and neutral isolation.

  • Transfer switch operation: Verify correct switching function and labeling for emergency/off positions.

  • Disconnects and overcurrent protection: Accessible, properly rated, and clearly marked.

  • Fuel line and exhaust systems: Check for leaks, proper venting, and clearance from openings or combustibles.

  • System labeling: Permanent signage for emergency power, service disconnects, and identification placards.

  • Startup and functional testing: Confirm the generator starts automatically (if applicable) and transfers load safely.

  • Fire and safety compliance: Verify separation distances and exhaust discharge per manufacturer instructions and fire code.

Important Notice: The inspection and review items listed above are intended to serve as a general guideline and do not represent a complete list of all code, safety, or installation requirements. Additional elements may be included, excluded, or modified based on specific project conditions, system design, or field observations. All code references cited are based on the State of Texas’ currently adopted editions of the National Electrical Code (NEC), International Residential Code (IRC), International Fire Code (IFC), and International Building Code (IBC). Local Authorities Having Jurisdiction (AHJs) may adopt different code editions or amendments that can alter applicable requirements. It is the responsibility of the contractor or system owner to confirm compliance with the locally adopted codes and standards in effect at the time of project submission.