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Old 06-25-2012, 08:49 PM   #1
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Generator power transfer switch


I'm wanting to run a supply line from my 15kw generator to supply my home in a emergency. Would a double throw transfer switch be what I need to isolate my power from the grid?

I'm not a professional., But I did stay at Holiday Inn Express last night.

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Old 06-25-2012, 08:52 PM   #2
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Generator power transfer switch


For something that size, I would look for a breaker interlock. Unless you want something that changes over automatically.

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Old 06-25-2012, 08:58 PM   #3
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Generator power transfer switch


Would you explain the difference in the two?

I'm not a professional., But I did stay at Holiday Inn Express last night.
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Old 06-25-2012, 09:17 PM   #4
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Generator power transfer switch


A breaker interlock switch is a simple installation, requires only wiring the generator to a back feed breaker. A transfer switch will require quite a bit more wiring to affect the same result. Either way, a 15kw generator will pretty much allow you to use most of your circuits, with only a few exceptions. This is a portable generator, I assume?
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Old 06-25-2012, 09:50 PM   #5
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Generator power transfer switch


It's a PTO driven generator. I'm going to do some research on the interlock. What im calling a double throw breaker, does in one action/throw removes your feed from grid an places you onto your standby power source eliminating potential of someone being electrocuted or generator from being fired form back feed.

I'm not a professional., But I did stay at Holiday Inn Express last night.
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Old 06-25-2012, 09:59 PM   #6
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Generator power transfer switch


Quote:
Originally Posted by jburd964 View Post
It's a PTO driven generator. I'm going to do some research on the interlock. What im calling a double throw breaker, does in one action/throw removes your feed from grid an places you onto your standby power source eliminating potential of someone being electrocuted or generator from being fired form back feed.

I'm not a professional., But I did stay at Holiday Inn Express last night.
That is a nice set-up, but can be quite pricey. A breaker interlock is cheap...if you have a "standard" panel you can get one for less than 50 bucks.

The interlock is the metal lever installed on the breakers. It won't allow POCO power and emergency power to be on at the same time.

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Last edited by k_buz; 06-25-2012 at 10:02 PM.
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Old 06-25-2012, 10:04 PM   #7
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Generator power transfer switch


http://www.interlockkit.com/
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Old 06-25-2012, 10:18 PM   #8
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Generator power transfer switch


It may be helpful to state that my main feed comes from under ground to the outside wall of home. My house has spray foam insulation and my main breaker panel is inside on a wall away form external main.
I looked at the interlock system and that would be a lot cheaper than the double throw setup but I think I'll have to go that rout seeing as I can't pull new wires to feed inside breaker panel. Any other suggestion would be appreciated.

I'm not a professional., But I did stay at Holiday Inn Express last night.
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Old 06-26-2012, 10:42 PM   #9
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Generator power transfer switch


depending what you want to do with your generator you can pick up a generator panel from a big box store for around $160, it has the interlock built in. You basically feed one side of the main from a 30A breaker and the other side of the main from the generator. what i generally do is install a weather proof 30A twistlock plug on the outside of a house and run it to the genny panel. build them an extension cord with two male ends that plug into the wall and the genny. When the power goes out all they have to do is flip the genny panel breaker plug in the cord and fire up the genny and everything in the genny panel comes back on. It's an idiot proof install.
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Old 06-27-2012, 05:52 AM   #10
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Generator power transfer switch


In Australia we dont use metal mechanical type interlocks such as
the one shown in the picture.
Instead we use a DPDT switch.
Probably more reliable in the long run.
And cant be miss used.

Do you use DPDT switchs as transfer switchs ?
Or are they mostely a mechanical interlock type.
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Old 06-27-2012, 10:18 AM   #11
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Generator power transfer switch


The issue with the dpdt switch is that the neutral remains connected. In theory the guy trying to fix the power lines could get a whack off your genny if circumstances are right. I'm not sure what the rule is on neutrals in the states or even here in Canada code wise but every genny panel I've ever seen switches the neutrals out as well.
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Old 06-27-2012, 10:57 AM   #12
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Generator power transfer switch


These are pictures of my main/meter box.

I'm not a professional., But I did stay at Holiday Inn Express last night.
Attached Thumbnails
Generator power transfer switch-image-412589832.jpg   Generator power transfer switch-image-3827745724.jpg   Generator power transfer switch-image-4236881471.jpg   Generator power transfer switch-image-1840010008.jpg  
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Old 06-27-2012, 10:59 AM   #13
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Generator power transfer switch


Is there a inter lock for such a application? Any suggestions?

I'm not a professional., But I did stay at Holiday Inn Express last night.
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Old 06-27-2012, 11:18 AM   #14
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Generator power transfer switch


This is what you need:

http://www.geindustrial.com/publibra...T-458A|generic

Its 39.97 at HD

http://www.homedepot.com/webapp/wcs/...|e|11593998877

Double check the model of your panel and that kit.

Here is a 50 amp inlet that you can add to the bottom of your meter/main panel, no extra box required:

http://www.homedepot.com/webapp/wcs/...5f%2d202216491

Last edited by Auger01; 06-27-2012 at 12:24 PM. Reason: added inlet
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Old 06-27-2012, 01:23 PM   #15
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Generator power transfer switch


This is great, I was looking to spend $300 on a DPDT switch. Going to get ahold of the permitting office, hopefully this will be good with them and they come up with some crazy crap. Thanks for everyone's input.

I'm not a professional., But I did stay at Holiday Inn Express last night.

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