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Electrical question for new workshop rlz 02-03-2009
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Posted by Steve Barker on February 6, 2009, 3:36 pm
jamesgangnc@gmail.com wrote:
>> jamesgangnc wrote:
>>>> Wayne Whitney wrote:
>>>>>>> At 400' away, you had best perform a voltage drop calculation, which
>>>>>>> will probably lead to increasing the wire size above #6 Cu for a 50
>>>>>>> amp circuit.
>>>>>> I hear ya, but as i stated before, we ran a shop 300 feet away for 30
>>>>>> years on a 10ga.
>>>>> A quick google for "voltage drop calculator" gave me a web site which
>>>>> claimed that for 30 amps on #6 Cu for 400 feet (one-way), the voltage
>>>>> drop for a 240 volt circuit would be 4.8%. So go ahead and use your
>>>>> #6 Cu, but put it on a 30 amp circuit breaker instead of a 50 amp
>>>>> circuit breaker.
>>>>> Cheers, Wayne
>>>> I'll do what works. The #6 is actually good for about 70A. The 50 will
>>>> be fine. Right now, i'm running a refrigerator, lights, two door openers
>>>> and two 1000 W. tank heaters on a 12-2 NM-b laying on the ground. The #6
>>>> will be WAY WAY overkill, but that's what I'll do. I'll never pull
>>>> anywhere nears 30A anyway.
>>>> s
>>> Turn all that shit on at the same time and then measure the voltage. You'll
>>> be surprised.
>> 118
>> thanks
>> steve- Hide quoted text -
>> - Show quoted text -
>
> Don' believe you. Make sure it's actually on, not just turned on. In
> other words both your tank heats are putting out heat. Two 1000 watt
> tank heats are about 16 amps. There's no way you're running 16 amps
> over 400 feet of 12/2 and not seeing a voltage drop. Nevermind the
> refer and the lights which have to be pushing you up to 20 amps total
> if they kick in while both tank heaters are on. I'd consider a
> lockout circuit so that only one tank heater can be on at a time if
> you want to keep the wire size down.

Everything works just fine the way it is. Believe it or not, it doesn't
really matter to me what you believe.

steve

Posted by on February 6, 2009, 3:42 pm
> jamesgan...@gmail.com wrote:
> >> jamesgangnc wrote:
> >>>> Wayne Whitney wrote:
:
> >>>>>>> At 400' away, you had best perform a voltage drop calculation, wh=
ich
> >>>>>>> will probably lead to increasing the wire size above #6 Cu for a =
50
> >>>>>>> amp circuit.
> >>>>>> I hear ya, but as i stated before, we ran a shop 300 feet away for=
30
> >>>>>> years on a 10ga.
> >>>>> A quick google for "voltage drop calculator" gave me a web site whi=
ch
> >>>>> claimed that for 30 amps on #6 Cu for 400 feet (one-way), the volta=
ge
> >>>>> drop for a 240 volt circuit would be 4.8%. =A0So go ahead and use y=
our
> >>>>> #6 Cu, but put it on a 30 amp circuit breaker instead of a 50 amp
> >>>>> circuit breaker.
> >>>>> Cheers, Wayne
> >>>> I'll do what works. =A0The #6 is actually good for about 70A. =A0The=
50 will
> >>>> be fine. =A0Right now, i'm running a refrigerator, lights, two door =
openers
> >>>> and two 1000 W. tank heaters on a 12-2 NM-b laying on the ground. =
=A0The #6
> >>>> will be WAY WAY overkill, but that's what I'll do. =A0I'll never pul=
l
> >>>> anywhere nears 30A anyway.
> >>>> s
> >>> Turn all that shit on at the same time and then measure the voltage. =
=A0You'll
> >>> be surprised.
> >> 118
> >> thanks
> >> steve- Hide quoted text -
> >> - Show quoted text -
> > Don' believe you. =A0Make sure it's actually on, not just turned on. =
=A0In
> > other words both your tank heats are putting out heat. =A0Two 1000 watt
> > tank heats are about 16 amps. =A0There's no way you're running 16 amps
> > over 400 feet of 12/2 and not seeing a voltage drop. =A0Nevermind the
> > refer and the lights which have to be pushing you up to 20 amps total
> > if they kick in while both tank heaters are on. =A0I'd consider a
> > lockout circuit so that only one tank heater can be on at a time if
> > you want to keep the wire size down.
> Everything works just fine the way it is. =A0Believe it or not, it doesn'=
t
> really matter to me what you believe.
> steve- Hide quoted text -
> - Show quoted text -

The tank heaters don't care if it's 115 or just 100. But it's hard on
that refer compressor when it has to start up wiht both tank heaters
on.

Posted by Steve Barker on February 7, 2009, 9:17 am
jamesgangnc@gmail.com babbled some shit he knew nothing about:
>
> The tank heaters don't care if it's 115 or just 100. But it's hard on
> that refer compressor when it has to start up wiht both tank heaters
> on.

Not hard on it 'cause the voltage is always around 115 - 118. YOU seem
to have a problem with comprehension. You don't seem to understand what
you've been told. So, here's the deal. I'll drop the thread, and you
can fuck off.

s

Posted by jamesgangnc on February 9, 2009, 8:55 am
> jamesgangnc@gmail.com babbled some shit he knew nothing about:
>> The tank heaters don't care if it's 115 or just 100. But it's hard on
>> that refer compressor when it has to start up wiht both tank heaters
>> on.
> Not hard on it 'cause the voltage is always around 115 - 118. YOU seem to
> have a problem with comprehension. You don't seem to understand what
> you've been told. So, here's the deal. I'll drop the thread, and you can
> fuck off.
> s
You just don't like being confronted with the facts. You don't run 16 amps
400 feet on 12/2 wire and not have a voltage drop. And telling someone else
it's ok is bad advice.



Posted by PeterD on February 9, 2009, 11:44 am
wrote:

>> jamesgangnc@gmail.com babbled some shit he knew nothing about:
>>> The tank heaters don't care if it's 115 or just 100. But it's hard on
>>> that refer compressor when it has to start up wiht both tank heaters
>>> on.
>> Not hard on it 'cause the voltage is always around 115 - 118. YOU seem to
>> have a problem with comprehension. You don't seem to understand what
>> you've been told. So, here's the deal. I'll drop the thread, and you can
>> fuck off.
>> s
>You just don't like being confronted with the facts. You don't run 16 amps
>400 feet on 12/2 wire and not have a voltage drop. And telling someone else
>it's ok is bad advice.


A 400 ft run of 12 AWG, at 120 volts, a 15 amp load, will drop 23.7
volts, giving a terminal voltage of about 96.3 volts. The power lost
will be 355 watts over the run. Power available at terminal will be
1450 watts.


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