Why does a generator need a transfer switch?
Because the alternative can hurt someone you’ll never meet. NES puts it plainly: “Never hook up a generator directly to your home’s electrical service or wiring. This can cause backfeeding and pose a serious risk to NES lineworkers.” A generator tied straight into the house wiring can push power back through the transformer onto lines a lineworker believes are dead.
A transfer switch, or a listed interlock on the panel, makes it one source or the other, utility or generator, never both. The standby unit in our gallery sits beside a brick house, wired through the meter and a transfer switch.
Standby or portable: which fits your house?
A standby generator sits on a pad outside, runs on natural gas or propane, and starts by itself when the power drops. It suits a house with medical equipment, a sump pump, or people who work from home. Because it needs a gas line as well as wiring, it helps that Jamie is certified in gas line work too.
A portable generator with a hookup is the lighter option: an inlet box on the outside wall, a transfer switch or interlock, and a cord. You roll the generator out, plug it in and choose which circuits to run. The CPSC counts about 85 deaths a year from carbon monoxide from portable generators, so it runs outdoors, away from doors, windows and vents, and never in the garage.
What do you want to keep running?
That question sizes the generator. A whole-house unit carries everything, central air included. A smaller one covers the essentials: the refrigerator, the furnace blower, some lights, a well pump if you have one, the outlets the home office needs. We make that list with you at the estimate and size from it.
Middle Tennessee learned the value of a plan during Winter Storm Elliott in December 2022, when TVA ran rolling blackouts for the first time. A hookup put in on a mild afternoon is a lot calmer than shopping for one during the next storm.
Jamie’s certifications cover generators, gas lines and solar, so the questions that come up around backup power don’t need a second opinion.
What moves the cost of a generator install?
The generator’s size and type; whether there’s natural gas at the house or a propane tank to place; how far the unit sits from the gas meter and the panel; the pad; the transfer switch, automatic or manual; and the condition of the panel it ties into. The permit gets its own line.