Hire a licensed electrician and follow local electrical codes and permit requirements
Choose the generator type and size based on essential loads
Select a transfer switch or interlock kit rated for the generator and service panel
Turn off utility power before any work begins
Install the generator outdoors on a level, well-ventilated surface away from openings
Mount the transfer switch near the main electrical panel
Route generator power cable from the generator inlet to the transfer switch or interlock inlet
Install a weatherproof power inlet box if using a portable generator
Connect the inlet box to the transfer switch or interlock kit with properly sized wiring
Connect the transfer switch output to the circuits or subpanel you want backed up
Bond and ground the system according to code and manufacturer instructions
Connect the generator to the transfer switch or inlet using the correct cord and plug
Test the transfer switch operation with utility power off and generator running
Verify the generator powers only the selected circuits
Label all backed-up circuits and transfer equipment clearly
Perform a final inspection if required by local authorities
Maintain safe clearances, ventilation, and fuel handling at all times