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Use 10 or 12 gauge extension cord with 20 amp outlet for 100 feet cord

Use 10 or 12 gauge extension cord with 20 amp outlet for 100 feet cord

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  #1  
Old 11-08-16, 05:35 PM
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Use 10 or 12 gauge extension cord with 20 amp outlet for 100 feet cord

Looking for advice on selecting an extension cord. Looking for a 100 foot extension cord to access an area where we're unable to install a sub panel (because we're moving around). The cord would be used with a 12 amp shop vac, 13 amp electric leaf blower, and hammer drills. Max amps would be 14 most continuous use 13 amps.

Currently we have a 20 amp outlet in the garage (we believe is wired with 12 gauge). Can we go from 12 gauge wire (wire to the outlet) then to a 10 gauge extension cord. Or should we limit ourselves to 12 gauge wiring. Here's the question:

From a 20 amp garage outlet (likely served by 12 gauge wire and on a 20 amp breaker) we plan to use a 100 foot extension cord. Should we choose the 10/3 extension cord or the 12/3 extension cord? We'd prefer to use the 10/3 to avoid amp drop but are concerned about going from 12 gauge to 10 gauge wire. We are limiting the search to 5-15 amp extension cords (so we could also use the cord with 15 amp outlets). Options:

Preferred option

10/3 100'SJTW YELLOW JACKET EXTENSION CORD W/LIGHTED END

104/30 BC 0.567 in

Alternate if better to stick with 12 gauge and ok amp drop

12/3 100'SJTW YELLOW JACKET EXTENSION CORD W/LIGHTED END

65/30 BC 0.420 in

Alternate prefer to avoid so we cord could be used with 15 amp outlet

10/3 100'SJTW YELLOW JACKET EXTENSION CORD W/LIGHTED T-BLADE

same 104/30 BC 0.567 in but with 20 amp T blade
 
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  #2  
Old 11-08-16, 05:45 PM
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A #10 gauge extension cord is unnecessary. You will do fine with the #12/3 cord.
 
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Old 11-08-16, 07:40 PM
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If you are concerned about drop.... go with the #10. There is no problem with doing that.
Your devices are not terribly sensitive to slight drops so it's not of critical concern.
 
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Old 11-09-16, 06:20 AM
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We'd prefer to use the 10/3 to avoid amp drop but are concerned about going from 12 gauge to 10 gauge wire
Going from a smaller gauge wire to a higher gauge, the #10, is fine and I would go that route.

You couldn't do it the other way around, and feed a #12 wire with a #10 30amp wire.
 
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Old 11-09-16, 05:00 PM
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Thanks for the quick and helpful replies. My garage and outdoor and garage outlets are 20 amp GFCI so the 12 gauge wire to the outlet and GFCI should give me a safety margin.
 
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