Generator Transfer Switches: What Manuals Say
A transfer switch connects a generator to your home’s wiring so power can only come from one source at a time. This guide summarises what two manufacturers’ manuals say about connecting a portable generator to a house, read on 5 November 2026. It is not a wiring guide, and the work must be done by a licensed electrician.
What the manuals say
- Westinghouse (WGen7500): the manual recommends a manual transfer switch when connecting directly to a building’s electrical system. The connection must follow national and local electrical codes and be completed by a qualified electrician.
- Champion (100809): connection to your home’s electrical system requires a listed 30A transfer switch installed by a licensed electrician and approved by the local authority. The connection must isolate the generator from utility power and comply with codes.
Why backfeeding matters
Champion’s manual calls connecting a generator to the utility lines, known as backfeeding, a dangerous practice that is illegal in many states and municipalities. Power flowing back onto the line can seriously injure or kill a utility worker, and it can damage your generator and appliances. A transfer switch isolates the generator from the utility, so that cannot happen.
Manual and automatic types
| Type | How it works |
|---|---|
| Manual transfer switch | You start the generator and move the switch from utility to generator yourself, and back when power returns. |
| Automatic transfer switch | It senses the outage and switches over without you, normally paired with a standby generator that starts itself. |
We have no sourced price data for either type, so we show none.
Check the generator itself
- Transfer switch ready. The Westinghouse WGen7500 specification lists “Transfer Switch Ready” with a 120/240 V 30 A L14-30R outlet. Our comparison tool has a “transfer ready” field and shows “Not stated” where the maker does not say.
- Neutral bonding. The Westinghouse generator ships with its neutral bonded to ground. With a panel board transfer switch, an electrician needs to decide whether that bond must be removed so household GFCI circuits work, and Westinghouse says the unit must then be relabelled. Do not change it yourself.
- Grounding rod. Westinghouse says a licensed electrician must decide whether one is needed.
What we could not verify
- Code text. We did not read the National Electrical Code or local rules, which an electrician and your inspector apply.
- Prices and brands. We name no switch products and give no installation costs.
- Alternatives. Our guide to connecting without a transfer switch has not been re-checked against sources yet.
Related guides
Frequently asked questions
Do I need a transfer switch?
Both manuals we read say to use one when connecting a generator to a house’s wiring, installed by a qualified or licensed electrician.
Can I plug a generator into a wall outlet?
No. That causes backfeeding, which can electrocute utility workers.
Can I install it myself?
Both manufacturers say a qualified or licensed electrician must make the connection.
