duplex outlet current capacity

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Old 12-19-05, 06:37 PM
rick kalin
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duplex outlet current capacity

I was looking at an extension cords at Lowe's the outer day that was listed as 10/3 100 ft and 20 amp capacity. The plug had a vertical pin and a horizontal pin. The outlets in my garage are protected with 20 amp breakers but they only have duplex outlet with two vertical pins. Are these 15 amp outlets? connected to 20 amp breakers?
 
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Old 12-19-05, 06:49 PM
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Originally Posted by rick kalin
I was looking at an extension cords at Lowe's the outer day that was listed as 10/3 100 ft and 20 amp capacity. The plug had a vertical pin and a horizontal pin. The outlets in my garage are protected with 20 amp breakers but they only have duplex outlet with two vertical pins. Are these 15 amp outlets? connected to 20 amp breakers?
Yes and yes.
 
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Old 12-19-05, 07:06 PM
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Originally Posted by rick kalin
I was looking at an extension cords at Lowe's the outer day that was listed as 10/3 100 ft and 20 amp capacity. The plug had a vertical pin and a horizontal pin. The outlets in my garage are protected with 20 amp breakers but they only have duplex outlet with two vertical pins. Are these 15 amp outlets? connected to 20 amp breakers?
The NEC permits one or more 15A duplex on 20A circuits. I believe the thinking behind that is that any device with a 15A plug cannot be rated at more than 15A, but you could easily have two items rated at less than 15A that you could use safely on a 20A circuit simultaneously. For example a 8A saw and a 7A shopvac.

A 15A single (simplex, I suppose) receptacle outlet would not be permitted. If you want to use the extension cord, just replace the 15A duplex with a 20A duplex.

NEMA 5-15R duplex = what you have now
NEMA 5-20P = the plug on the Lowes cord
NEMA 5-20R = the receptacle you need to use the Lowes cord in your garage
 
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Old 12-20-05, 05:29 AM
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duplex outlet current capacity

If the plug and outlet of the cord have a horizontal and vertical blade/slot it is rated at 20 amps and 240 volts. I use one of these on my table saw which is set at 240 volts. Now, if one of the blades is vertical and the other one is a combination horizontal/vertical (sort of a "t") then it is rated at 120 volts 20 amps.
You have the 15 amp outlets in your application since they are "pass thru", and don't require 20 amp outlets.
 
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Old 12-20-05, 06:31 AM
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Old 12-22-05, 06:51 PM
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Originally Posted by chandler
If the plug and outlet of the cord have a horizontal and vertical blade/slot it is rated at 20 amps and 240 volts.
Not necessarily. It depends which prong is "turned" if the circuit is 240V or 120V.

With ground down, the left slot of a receptical being horizontal (or T shaped), and the right slot being vertical, is 120V 20A. With the left slot vertical, and right slot horizontal,
you have 240V 20A. Needless to say, both slots vertical are 120V 15A, and both slots horizontal are 240V 15A.
 
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