What kind of outlets are these? Differences?

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Forum topic by Raymer posted 02-17-2019 05:11 PM 762 views 0 times favorited 8 replies Add to Favorites Watch
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92 posts in 935 days

02-17-2019 05:11 PM

Sorry if this is in the wrong forum and I realize this is woodworking, not electrical, but LJ has been very helpful and figured some of you may have dealt with various 220 outlets.

When we had our home built 5 years ago, I knew I would eventually need 220. The builder offered to install 220 to the garage. He said he was upgrading my service from like 150amp to 200 or 250 forget which. They installed 2 outlets and the service upgrade for an additional $250, seemed like a no brainer. Now I’m not sure what each of these two outlets are for and how they can be used, such as what tools would make use of each plug.

Any information would be appreciated.

-- -Measure once, cut twice, cut once more for good measure.

8 replies so far

View MrRon's profile


5934 posts in 4096 days

#1 posted 02-17-2019 05:23 PM

One is for a dryer(don’t know which one)

View Fred Hargis's profile

Fred Hargis

6424 posts in 3346 days

#2 posted 02-17-2019 05:29 PM

My guess: the top one might be a Nema 14-50, which has a neutral to support both 240V and 120V. You commonly see these used with appliances that have a need for both voltages. The lower one is a locking outlet, and it appears to be an L6-20. a 20 amp outlet and would be common with most woodworking tools. Most folks don’t use all locking receptacles, so the straight blade version is actually the most common. The first one could be used for a dryer or high voltage appliancee, it’s rated at 50 amps (at least that’s what i think it is).

-- Our village hasn't lost it's idiot, he was elected to congress.

View MrUnix's profile


8212 posts in 3052 days

#3 posted 02-17-2019 05:37 PM

Standard NEMA plug configurations:


-- Brad in FL - In Dog I trust... everything else is questionable

View woodbutcherbynight's profile


6176 posts in 3262 days

#4 posted 02-17-2019 05:50 PM

Thanks for the chart Brad!!

-- Live to tell the stories, they sound better that way.

View Mike_D_S's profile


605 posts in 3067 days

#5 posted 02-17-2019 06:34 PM

Brad for the win. Very useful chart.

-- No honey, that's not new, I've had that forever......

View CaptainKlutz's profile


3604 posts in 2347 days

#6 posted 02-17-2019 10:55 PM

(1) Nema 14-50R 4 wire receptacle with 2 hots, neutral, and ground (1st pic)
(1) Nema L6-XX locking receptacle with 2 hots, and ground (2nd pic)
L6-20 and L6-30 are similar looking. Need to look check OD, and look at the markings on receptacle to figure out which one.

Suggest you check your breaker panel for size of breakers before using the circuits.
Technically, they should have proper 50A and 20-30A breakers on circuits; but the locking L6 series is not common in residential applications as they are more expensive than non-locking, so I wonder what your electrician was thinking? I know why the 50A is not locking; 50A locking plug/receptacle run about $150 a set.

Have often seen over rated receptacles used for breaker rating. Last house I built electrician used 14-50R on 40A breaker, as nema 40A plug doesn’t exist. Code doesn’t require the breaker and receptacle amperage to match. Only the wire size and breaker are defined in code, as breaker protects wiring not devices using the power.

Best Luck.

-- If it wasn't for bad luck, I wouldn't have no luck at all, - Albert King - Born Under a Bad Sign released 1967

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Fred Hargis

6424 posts in 3346 days

#7 posted 02-18-2019 11:38 AM

so I wonder what your electrician was thinking?
Best Luck.

- CaptainKlutz

That thought crossed my mind as well.

-- Our village hasn't lost it's idiot, he was elected to congress.

View Fresch's profile


500 posts in 2773 days

#8 posted 02-18-2019 12:25 PM

Was it his house? He might have changed his tools to twist lock so on the job his cord didn’t unplug, cut down on theft.

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