Q about 240/120 dual voltage receptacles

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Old 01-22-13, 09:29 AM
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Q about 240/120 dual voltage receptacles

I see duplex receptacles at the home center with 240V slots (sideways) AND 120V slots on the same body. Are these sections separate from each other or do they have a break-off tab? Is the intent to wire the 120 on one leg of the 240, or have dual feeds in the box? Is there code to guide this decision?
 
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Old 01-22-13, 11:31 AM
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Well, I don't know about this product that you have pictured, but I found a 20A version:

Leviton Ivory 125/250V DUAL Voltage Receptacle Duplex Outlet 20A 5844-I

The directions indicate that it has break-off tabs. So, it's likely that one leg supplies power to one of the 240V sides and the 120, and the other leg only supplies to the other 240V side, unless one breaks the tab and uses a separate circuit entirely...
 
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Old 01-22-13, 07:41 PM
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So...my question is...it's OK to power the 120 off 1 leg of the 240 AND OK to remove the tab & feed the 120 from a different breaker? NEC is OK with either scheme?
 
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Old 01-22-13, 08:02 PM
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It appears that it is designed to remove the tab to feed one receptacle from one circuit and the other receptacle from a different circuit, and I expect that if it wasn't code, they wouldn't have made it where it could do that.
 
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Old 01-22-13, 08:15 PM
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If this device was fed by two circuits, 1 - 120 volt and 1 - 240 volt, you would be required to use a three pole breaker since the receptacles are on the same yoke/strap.

I would suspect it would normally be fed by a single 120/240 volt circuit, two hots, one neutral, and one ground, on a two pole breaker.
 
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Old 01-23-13, 08:48 AM
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What I was wondering is if the 120V recep. was experiencing a slight overload would the unloaded other 1/2 of the breaker hold it back from tripping? Do breakers respond to unbalanced loads the same as if they are balanced?

I used these in my workshop wiring, all on one circuit and at the time never imagined that I might have a large load on the 240 plug AND something loading the 120 at the same time. In nearly 20 years it's never tripped but if I ever do have a helper I can see it becoming a minor inconvenience.
 
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Old 01-23-13, 08:59 AM
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What I was wondering is if the 120V recep. was experiencing a slight overload would the unloaded other 1/2 of the breaker hold it back from tripping?
No....if you overloaded the 120v circuit the breaker will trip

I was never a big fan of these receptacles.
 
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