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+--- Thread: Elect system - AC (/showthread.php?tid=7616)
Elect system - AC - Wilhelmus Schreurs - 01-29-2009 04:37
Goodmorning all.
I have to correct Pete's statement of AC power
Nominal voltage is 120 volts, but voltage should be between 110 and 125. This is the same for either a single phase or 3 phase system.
220, 230 or 240 volts are basically single phase power, not 2 phases of a 3 phase system.
If you were to use 2 phases of a three phase system as in commercial or industrial uses, then you would have 3 phases of 120 volts to neutral, and between phases you would have (square root of 3 * 120volts) 1.73 * 120 volts or 208 volts.
Asothers have said, when using single phase power, you use 2 legs each of 120 volts to neutral, and they are 180 degrees apart.
Sowhen ones tries to use the two 30 amp cords, if they are on the same leg, the neutral could be loaded to 60amps.Does this matter? I donot know, others can chime in here,BUT if the two cords are routed all the way up to the panel, that is through the transfer switch, then through the30 amp breaker box, and to the main panel, then, NO, it does not matter at all, except you will only get 120 volts. I believe this is the way BB had it designed and that is why there areno 240 volt appliances in our coaches.
Having all that said,in the next couple of months, I will also be redoingmy system, and the 30 amp system will be removed. I will keep the 50 amp cord, and at the end of the cord. I use a 50 amp - 240 volt to 30 amp 120volt adapter, and even a 30 amp 120 volt to 15 amp 120 volt if I have to.
Terrace, B.C. Canada
Elect system - AC - timvasqz - 01-30-2009 04:38
Bill, I cant follow all that so I just assume that code maintains a
protection for public use and modifications outside of code may
function and work properly but may expose other dangers when
further mods assume code compliance..
I would like to learn how amperage or voltage makes its way to the
other leg /line/side/ of a two leg 50 amp service once there is a
droped neutral with a demand. I looked for web answers and only got
more confused??????????
Greg ofTim&Greg
94ptca
--- In WanderlodgeForum@yahoogroups.com, Wilhelmus Schreurs
>
> Goodmorning all.
>
> I have to correct Pete's statement of AC power
>
> Nominal voltage is 120 volts, but voltage should be between 110
and 125. This is the same for either a single phase or 3 phase
system.
>
> 220, 230 or 240 volts are basically single phase power, not 2
phases of a 3 phase system.
>
> If you were to use 2 phases of a three phase system as in
commercial or industrial uses, then you would have 3 phases of 120
volts to neutral, and between phases you would have (square root of
3 * 120volts) 1.73 * 120 volts or 208 volts.
>
> As others have said, when using single phase power, you use 2 legs
each of 120 volts to neutral, and they are 180 degrees apart.
> So when ones tries to use the two 30 amp cords, if they are on the
same leg, the neutral could be loaded to 60amps. Does this matter?
I do not know, others can chime in here, BUT if the two cords are
routed all the way up to the panel, that is through the transfer
switch, then through the 30 amp breaker box, and to the main panel,
then, NO, it does not matter at all, except you will only get 120
volts. I believe this is the way BB had it designed and that is why
there are no 240 volt appliances in our coaches.
>
> Having all that said, in the next couple of months, I will also be
redoing my system, and the 30 amp system will be removed. I will
keep the 50 amp cord, and at the end of the cord. I use a 50 amp -
240 volt to 30 amp 120volt adapter, and even a 30 amp 120 volt to
15 amp 120 volt if I have to.
>
>
> Bill 84 FC 35 SB "$quanderlodge"
> Terrace, B.C. Canada
>
>
>
>
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