How to Install a Manual Transfer Switch for a Portable Generator | Ask This Old House

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Published 2017-05-07
Ask This Old House master electrician Scott Caron visits Alaska to install a portable generator with a manual transfer switch to power hardwired appliances like a well pump and heating system using unleaded gasoline.

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Cost: $3,000

Skill Level: Moderate

Tools List for Installing a Manual Transfer Switch for a Portable Generator:
Drill
Lineman’s pliers
Wire strippers

Shopping List:
Portable gas generator
10-circuit manual transfer switch
Power inlet
10-3 non-metallic wiring
Wire nuts

Steps:
1. Mount the manual transfer switch near the main electric panel.
2. Select up to 10 circuits to be powered by the generator (240 volt circuits require two spots on the transfer switch).
3. Turn off power to the house at the main electric shut off.
4. Remove the cover on the main electric panel (work inside the electric panel is only recommended for licensed electricians).
5. Locate an available knockout hole on the electric panel and remove the plug. Attach the armored cable from the transfer switch to the electric panel.
6. Connect the ground and neutral wires from the transfer switch to the appropriate bus bars on the main panel.
7. Locate the first circuit to be powered by the generator and remove the power wire on the existing circuit breaker. Replace that wire with the red wire from the transfer switch marked “A.” Splice the black wire marked “A” from the transfer switch to the removed power wire using a wire nut. Repeat this process for all 10 circuits, ensuring the red and black wires from the transfer switch are a matched pair.
8. Use 10-3 non-metallic wiring to connect the transfer switch to a power inlet outside.
9. Use the provided generator cord to connect the power inlet to the generator (or make your own cable if a longer one is desired using bulk wire and connectors).
10. Ensure the generator has unleaded fuel and oil inside, then start the generator.
11. To test the wiring connections, flip the switches on the transfer switch from “Line” to “Gen.” The generator should power the selected circuits.

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How to Install a Manual Transfer Switch for a Portable Generator | Ask This Old House
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All Comments (21)
  • @FiloYappins
    I like how he introduced him to the utility room 😂😂😂😂
  • Just completed the break-in period and so far the unit is operating perfectly youtube.com/post/UgkxOTeIs0vv4_9B5hsmnLsk9r930uDQL… . I was amazed by just how quiet this little guy is. I kept having to walk down the driveway to the generator to make sure it was still running. In fact, the most annoying noise coming from the set-up is a high-pitched chirping coming from the pressure regulator on the propane line. I suppose it's possible my other propane-powered generator's pressure regulator is making the same noise, but the generator itself is so loud I've never noticed it. Build quality so far is excellent. My only nit is the service panel is a little tricky to remove. I feel like I might break off one of the plastic tabs when bending it back. I probably just need to work out the technique, so will not hold it against Champion.Next week I intend to fully load the unit to charge a large battery pack and will update this review if there's any problem (3000W continuous load vs a rated 3100W capacity while using propane). Absent any trouble there, I'm 100% pleased with this purchase.
  • @KawaRider88
    Every new house should have a mandatory transfer switch!
  • @itsnotan8
    Vin Diesel is a pretty good electrician.
  • @ITStechy
    Another nice thing about these manual transfer switches is that you leave one circuit not desired on genset power to alert you when line power is back with a radio and/or light plugged in. I keep my main HVAC breaker off until I know power from the grid has stabilized anyway and this is the way to go for alerting you safely.
  • I have a permanently installed 8 kW genset, propane fuel from 2 100 gal cylinders, and an automatic transfer switch. It's saved the day a number of times since utilities were "deregulated". If you're going with a portable genset there are three things I'd recommend: (1) Document every circuit breaker at your service entrance. Make sure you have a list of every load that every circuit breaker serves. With a 200 A service, you can't power up every circuit with a 7 or 8 kW generator. You can buy a kit to help you do that at Lowe's, Home Depot, or Harbor Freight for $20-25 (or so). (2) Get a "dual fuel" generator - gas or propane, for example. Long term storage of a 20 or 30 # propane tank is much safer than long term storage of 5, 10, or 15 gallons of gasoline in a can in your garage or pole barn. (3) If you go with gas, use ONLY non-ethanol (and do this religiously) - like in your lawn mower or boat.
  • @ElvisInNY
    I liked how they both agreed that the driveway was not the ideal location for the generator, but they both walked off camera at 2:00 and left it in the driveway.
  • @ericguthrie3859
    Certainly a better explanation for we the curious. I just have to understand how it works. I probably won’t be the one doing the work but at least I’m certain at how the power flow continues. Great graphics to detail what you were actually doing. Concise and directly to the point always staying on task.
  • @thewulvrine8042
    This is the best instructional video I have watch to date, very thorough and informative!
  • @commandertim575
    This is great! Best explanation (with animated diagraming) of how a typical transfer switch works. Just what I was looking for. Thanks. 👍
  • @Kevin_747
    Interesting episode. We lived for a week and a half after a bad storm on a 4500 watt gen. Had lights, refrigerator and ran our gas fired furnace. When we cooked on an electric skillet I made sure the furnace wasn't going to kick on. All done with extension cords. I need to look into a manual transfer.
  • @scorpion068
    20$ says hes going to wheel it under the deck right next to the vents 😂
  • @Rlaplante73
    This is an excellent step-by-step video presentation of the process from A to Z. Thank you!
  • Thank you for showing folks how to safely use a generator. Linemen appreciate when you use a transfer switch, those switches save lives while they are out restoring power.
  • @SilverCymbal
    Love this video, I have a ton of great generator videos myself and this is very helpful.
  • @robertcyr9220
    As a licensed electrician I never did a transfer switch your video makes it so easy anyone can install one of these
  • Greetings from Reno, Nevada. This one video was worth the subscription.