Extension Cord ? - Ford Powerstroke Diesel Forum
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post #1 of 12 Old 09-17-2019, 11:17 PM Thread Starter
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Extension Cord ?

So I have been doing some reading about plugging our trucks in when very cold winter nights arrive and a lot of people are saying to make sure to use a heavy duty extension cord. What exactly does that mean and I am sorry if this is a ridiculous question but this will be my first winter with a diesel.

Thanks in advance for your help!!
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post #2 of 12 Old 09-17-2019, 11:20 PM
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They suck a lot of power so get a good heavy chord from home store. No cheap Chinese harbor freight 99¢ jobbies. Also get a timer so it's only drawing power for a couple hours before you need it.

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post #3 of 12 Old 09-17-2019, 11:29 PM Thread Starter
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Originally Posted by guitarnut View Post
They suck a lot of power so get a good heavy chord from home store. No cheap Chinese harbor freight 99¢ jobbies. Also get a timer so it's only drawing power for a couple hours before you need it.

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Sounds good. Are the cords rated in any type of way or just pick up a heavy duty one.
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post #4 of 12 Old 09-18-2019, 12:24 AM
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12 gauge minimum. 10 gauge is better. The larger the gauge the cooler the wire will be.
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post #5 of 12 Old 09-18-2019, 12:34 AM Thread Starter
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Originally Posted by doubleslottedflaps View Post
12 gauge minimum. 10 gauge is better. The larger the gauge the cooler the wire will be.
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post #6 of 12 Old 09-18-2019, 02:16 AM
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Use as short of a cord as possible and lay it out straight. If you leave it rolled up then congratulations, you just made a small coil.
+1 on the timer and +1 on 10awg.
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post #7 of 12 Old 09-18-2019, 06:38 AM
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No, no, and NO! -hehehe

Let's keep to the facts. A 10ga wire is rated for 30 Amps (and here, in an extension cord, it's terminated with a 15 Amp receptacle). A 12ga wire is rated for 20 Amps, a 14ga 15 Amps, both have the same 15A receptacle at the end (the "vertical only" 2 blade, with the Neutral wider than the Hot).

Your Block Heater draws less than 15 Amps (it's only 1,000 watts - your wifes Hair Dryer, your Toaster Oven, Coffee Maker, all are usually 1,500 watts).

So, 10ga? Absolutely unnecessary, I mean, couldn't hurt, but to imply you need something like that is just wrong. I think the only reason not to use 14ga is not because of it's lack of capacity, but rather you could have to run a long length to get to your truck (over 50ft), plus they tend to be cheap & flimsy for something that's getting "dragged around" and tugged on.
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post #8 of 12 Old 09-18-2019, 07:20 AM
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@NoRalPh very true, but to justify my recommendation it’s always better to err on the side of caution in my opinion.

Assuming it is going to a 15A breaker, and assuming there are no other draws on the circuit, and assuming the breaker is functioning correctly, he should be fine on 14awg cord. Worst case is the breaker opens. Change any variable, and something burns.
No offense to the op, but asking that question leads me to think his electrical knowledge is limited. Again no offense.
Still too early to do math for me, but the price of a 10 awg cord ensures he buys the shortest one that will work instead of 150’ of 14/3 that can be used for other things too.

You are absolutely correct-14/3 will work. Would I personally recommend or do it myself? No
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post #9 of 12 Old 09-18-2019, 07:39 AM
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14/3? That's for lighting circuits

I would think most garages have 12ga to the receptacles, and a good 12ga extension cord would be my choice too (but again, not because of any "huge draw from the heater that requires it).

Seems to me that going out and getting a 30A cord for 10A load is kinda like taking that little tiny hose and sucking-dry the HPOP reservoir at oil changes. You're just pullin' you pud...
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post #10 of 12 Old 09-18-2019, 07:46 AM
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14 awg/3 conductor or type b plug.
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