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--></style></head><body><div>Jim - If they are UPSs (Uninterruptible Power Supply), if you unplug one/them the devices plugged into the UPS should just keep on working and not be affected. (Otherwise, there is a much larger problem here.)</div><div><br /></div><div>On the other hand, I am a jinx when it come to power failures and backup power. I have been present at more clients than I can remember where there was a loss of power and the backup failed. Each failure was different, but all when analyzed fell into the category of failure to adequately validate the system.</div><div><br /></div><div>So, in principle you SHOULD be able to unplug the UPS and see what kind of plug and outlet are there. But don't tell anyone you heard that from me!! 🙂</div>
<div><br /></div><div id="signature_old" style="clear:both"><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"> <br />===========================<br />Al Fuller<br />714.335.0248 Mobile<br /></div></div></div></div></div></div><div><br /></div>
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<div>From <a href="mailto:jamesf@groupwbench.org">jamesf@groupwbench.org</a></div>
<div>To <a href="mailto:Shop-talk@autox.team.net">Shop-talk@autox.team.net</a></div>
<div>Date 4/9/2025 10:43:07 AM</div>
<div>Subject Re: [Shop-talk] Determine NEMA outlet type if it’s plugged in?</div></div><div x-em-quote=""><br /></div>
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<p id="reply-intro">Yes, twist lock. The devices in question are UPSs, and are 2880va, 120v units. And it may be confirmation bias, but 2880va/120v = 24a, which is 80% of 30a, the standard derating. So I'm inclined to believe they are L5-30, especially since one unused one in the rail of 10 outlets is (local guy was able to unplug an unused unit). Does that make sense or am I thinking wishfully here (I have an order ready to go for mew ones with L5-30 plugs, just waitng for the outlet specs).</p>
<p>jim</p>
<p>On 2025-04-09 16:15, DAVID MASSEY wrote:</p>
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<div dir="ltr">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.</div>
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<div dir="ltr">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.</div>
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<div class="v1ydpb4963a08quoted-text-header">On Wednesday, April 9, 2025 at 10:03:22 AM CDT, Jim Franklin <jamesf@groupwbench.org> wrote:</div>
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<div dir="ltr">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...</div>
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<div dir="ltr">Thanks,</div>
<div dir="ltr">Jim</div>
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