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12 gauge extension cord with in-line switch? or custom made?

12 gauge extension cord with in-line switch? or custom made?


Old 04-05-14, 10:54 AM
Thread Starter
Join Date: Mar 2014
Location: USA
Posts: 10
12 gauge extension cord with in-line switch? or custom made?

Hi all,

Note: I rent a house so I can not change the actual outlets to install a wall mounted switch. I can't change much about the house.

I charge up my electric car at night via a 12 gauge 25 foot extension cord. I usually charge up at 120V @ 8AMPS but sometimes I charge up at 120V @ 12AMPS. I'd like to limit the amount of time the cord is "hot" & I'd like to avoid constantly unplugging the cord. The reason I do not wish to keep the cord "hot" 24/7 is because we have kids around the house (the chord is mostly high above where they can not reach it..but at one point it comes within reach as the cord goes out the unused mailbox) so I want to reduce potential accidents if they cut the cord & also the cord goes outside the house so I don't want a "hot" cord outside where the kids play.
So I was wondering if anyone knows about a 12 gauge extension cord with a built in in-line switch or if it is safe to add an in-line switch to an existing extension cord using components which can handle 15AMP or more. If this is a DUI I'd probably hire a local electrician since I'm already working multiple job and don't have time for a hobby project right now .

Thanks for suggestions and tips.
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Old 04-05-14, 11:11 AM
Nashkat1's Avatar
Join Date: Mar 2012
Location: USA
Posts: 8,470
First one I found. Will this work for you?

Old 04-05-14, 11:59 AM
Tolyn Ironhand's Avatar
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Location: Twin Cities, MN
Posts: 12,277
You could also use a plug in timer like this which it will only be on the times you choose automatically:
Amazon.com: GE 15153 Heavy Duty 24-Hour Mechanical Timer: Home Improvement

Or you could do a countdown timer like this which you set to run for a set length of time. So if your car takes 8 hours to charge, you set it to 8 hours and it will shut off after the set time expires.
Amazon.com: Woods 50030 Indoor Countdown Timer, 1-Outlet Grounded: Home Improvement

These are only examples and you can buy them in many stores.
Old 04-05-14, 03:17 PM
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Join Date: Sep 2005
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Posts: 4,251
I would make sure the extension cord is being plugged into a GFI receptacle or short GFI cord. This will help protect from most accidents involving the cord.

Here's a 15A grounded switch that may work
Belkin F7C016q Conserve Power Switch - Smarthome
Old 04-05-14, 03:31 PM
Join Date: May 2012
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Welcome! .
Old 04-06-14, 09:34 AM
chandler's Avatar
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Two birds....GFCI protection and test switch built in to disable it. Defiant, 2 ft. In-Line GFCI Cord, 30338213 at The Home Depot - Tablet
Old 04-06-14, 08:13 PM
Thread Starter
Join Date: Mar 2014
Location: USA
Posts: 10
I like the Belkin switch. The outlet is GFCI. So if I went the route of the Belkin switch here is the setup: 120V GFCI outlet->Belkin switch->12 guage extension cord 25ft->car's EVSE (electric vehicle supply equipment..has GFCI in it too)-> car (Chevy Volt)
Old 04-06-14, 08:17 PM
Thread Starter
Join Date: Mar 2014
Location: USA
Posts: 10
Thanks for the suggestion. It have have worked but the electric car uses a grounded prong too.
Old 04-07-14, 02:29 PM
Join Date: Jul 2009
Location: NYC
Posts: 302
Just curious. What car.

When I helped install one for a friend awhile back for his Tesla, we ran it to a sub - and from the sub, a 50 amp

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