20 amp extension cord on a 15 amp circuit


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Old 09-23-13, 09:12 PM
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20 amp extension cord on a 15 amp circuit

I have a 50 ft, 10 gauge/20 amp extension cord, it has male NEMA 5-20P and female NEMA 5-20R connectors. I found some NEMA 5-20R to NEMA 5-15P adapters online, if I were to get one of these adapters and plug the 20 amp extension cord into a standard household 15 amp circuit, are there any dangers if I keep the amps under 15?
 

Last edited by derwert; 09-23-13 at 09:29 PM.
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Old 09-23-13, 09:34 PM
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Welcome to the forums.

Absolutely no damage to the extension cord as the wire is rated for 30 amps.

Since you are using that extension cord in a 15a receptacle..... you'll get 15amps. before the breaker trips.
 
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Old 09-23-13, 10:11 PM
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Thanks for the quick and helpful information, it's really appreciated.

D
 
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Old 09-24-13, 12:28 AM
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Absolutely no damage to the extension cord as the wire is rated for 30 amps.
Actually, a #10 flexible cable is rated at 25 amperes.
 
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Old 09-24-13, 02:33 AM
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Actually it's 30 amps up to 50' and 25amps if over.

UL Ampacity Guidance Chart
 
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Old 09-24-13, 11:41 AM
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derwert

I have a 50 ft, 10 gauge/20 amp extension cord, it has male NEMA 5-20P and female NEMA 5-20R connectors. I found some NEMA 5-20R to NEMA 5-15P adapters online, if I were to get one of these adapters and plug the 20 amp extension cord into a standard household 15 amp circuit, are there any dangers if I keep the amps under 15?

I do this all of the time. (Anyone who knows me knows I love 20A connectors.)
 
 

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