[Shop-talk] Determine NEMA outlet type if it’s plugged in?

[DAVID MASSEY]

Are these the TwistLock variety?  If so many of them look very similar but have subtle differences making them incompatible with other styles.  This is to make a 120V/20 amp different from a 220V20 amp so as to avoid the possibility of plugging a 120V device into a 220V circuit.  Or a 120V 30A device into a 20A circuit.
You might be able to determine what styles you need from the nameplate ratings on the powered device.  In other words is it a 120V or a 220V device?  Of course if it dual voltage device it may be ambiguous.
Dave 


 

    On Wednesday, April 9, 2025 at 10:03:22 AM CDT, Jim Franklin <jamesf at groupwbench.org> wrote:   

 I’m dealing with a bunch of Schroedinger’s outlets here. All the outlets are in use so I can’t unplug them to look at the NEMA marking, but I need to replace the devices plugged in, which can be ordered with various plug types. Is there a way to tell from the outside what type I have? It’s round, which narrows it down to a few…

Thanks,
Jim
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