Wire sizing is determined by the amount of amperage that the connected device draws. Look on the nameplate of the motor and state the amperage. Then the question can be answered.
To find watts in kilowatts multiply kilowatts by 1000. In this case, 26 x 1000 = 26, 000 watts.
Safety & Regulations All installations must follow NEC, NFPA 37/70, and local codes and require proper permits. Only a licensed electrician or authorised Generac dealer (IASD) should perform the electrical and fuel hookups. Units must be installed outdoors, on solid, level ground, at least 5 ft from structures and windows. Site Pre-Installation Choose your location: well-ventilated, level, on a concrete pad or gravel base, positioned close to electrical panel & fuel source. Ensure clearances: typically 5 ft from walls, 3 ft from front/openings, as per manual ([How-To Haven: Clear Instructions. Prepare the base: install a non-combustible, level pad, keeping unit level within 13 mm (½″). 3. Utilities & Connections Fuel setup: Run a gas or propane line sized to Generac specs, include safety shutoff valves. Electrical hookup: Connect to a transfer switch adjacent to your home panel, not direct hijacking of power lines (to prevent backfeed. Use properly rated cables and install a grounding rod tied to the generator frame. Installation & Control Setup Mount the generator to the pad, securing with bolts per manual specifications. Controller activation: Power up the unit, run through the activation wizard (date/time, fuel type), and provide the code from Generac. Initial Testing & Commissioning Run a test exercise: Set up auto-test schedule (weekly/monthly), and test manually for about 5 minutes. Simulate power outage: Switch your panel to generator mode and verify all connected circuits receive power. Validate fuel/electrical behavior and confirm automatic transfer via transfer switch. Final Inspection & Maintenance Get sign-off: Have local authorities inspect for compliance and final approval. Establish routine maintenance: Includes monthly test runs, oil/filters, battery checks—ask for an annual maintenance plan with your installer. Step-by-Step Video Instructions How to Install a Generac 26kW 200A Generator This video walks through site prep, transfer switch integration, fuel hookups, and commissioning. Key Takeaways Never DIY the electrical or fuel systems—always use professionals to maintain safety, warranty, and code compliance. Proper location & base prep are essential—for ventilation, stability, and exhaust safety. Transfer switch is mandatory to prevent dangerous backfeed and protect utility workers. Routine testing & maintenance ensure reliability in an actual outage.