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Posted by Wayne Whitney on February 4, 2009, 1:28 pm
>> 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
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Posted by Steve Barker TB on February 4, 2009, 4:01 pm
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
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Posted by jamesgangnc on February 6, 2009, 8:32 am
> 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.
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Posted by Steve Barker on February 6, 2009, 9:05 am
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
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Posted by on February 6, 2009, 11:25 am
> jamesgangnc wrote:
> >> Wayne Whitney wrote:
> >>>>> At 400' away, you had best perform a voltage drop calculation, whic=
h
> >>>>> 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 3=
0
> >>>> 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%. =A0So go ahead and use you=
r
> >>> #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 5=
0 will
> >> be fine. =A0Right now, i'm running a refrigerator, lights, two door op=
eners
> >> and two 1000 W. tank heaters on a 12-2 NM-b laying on the ground. =A0T=
he #6
> >> will be WAY WAY overkill, but that's what I'll do. =A0I'll never pull
> >> 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. 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.
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>> will probably lead to increasing the wire size above #6 Cu for a 50
>> amp circuit.