On 4/7/2017 4:35 PM, Michael J. Mahon wrote:
> rickman  wrote:
>> On 4/5/2017 9:27 PM, Dennis Lee Bieber wrote:
>>> On Thu, 6 Apr 2017 00:43:45 -0000 (UTC), Martin Gregorie
>>>  declaimed the following:
>>>
>>>
>>>> Of course, 110v has a lot to answer for there: in the UK a 3kw heater or
>>>> power tool draws 12.5A, just under the 13A limit for standard plugs, but
>>>> a 3kw appliance will draw 27.25A in the USA - and its amps, not volts,
>>>> that melts or burns insulation off a cable.
>>>
>>> And in the US, that appliance will be using a 240V connection (two 120V
>>> circuits of opposite phase: +120, Neutral, -120, and earth ground [I'm
>>> using +/- for phase, since both are AC]). Regular wall sockets tend to be
>>> 15A, with the entire linked set on the circuit maxing out around 20A.
>>
>> To balance the current draw on the two phases I have seen outlets run on
>> both phases of the power line.  Some will be wired on one phase and some
>> on the other.  I was very surprised to find 240 volts when measuring
>> from one socket to another one day.  I was reading something about this
>> recently and it seems the two sockets in the same box are not to be
>> wired on different phases of the 240 line.  Who knew?
>>
>
> Hmmm. Sounds like a code violation to wire both phases to (115v) sockets in
> the same box...

Yes, that's what I was saying.  But adjacent boxes are ok to wire on
different phases and they *are* done that way.

--

Rick C

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