I have a customer who wants to have a 30A 120V RV receptacle installed at the back of his property. The overall run including the portion in the house is 300'. He wants to have a full 30A capacity to run AC, micro, etc. Looks to me that #4CU is a minimum cond size to make up for VD.My question is could I reduce the 30' run in the interior to anything smaller than the #4 and still be ok? Didn't know if that 10% portion of the run is as critical as the other 90%. Would running out at 240V and setting a step down xfmr be a better route? Open to all suggestions.
Voltage drop ????
- Thread starter nizak
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cadpoint
Senior Member
- Location
- Durham, NC
Why not run them 60 amps... first thing you know there living out in the backyard and your 30A looks embracing... just a thought!
kwired
Electron manager
- Location
- NE Nebraska
That is fine but it will need to be even larger for voltage drop.
kwired
Electron manager
- Location
- NE Nebraska
You would need to check the price difference between running your #4 copper vs cost of transformer and probably at least 8 AWG. You could run 1/0 aluminum - probably cost maybe 2/3 of what 4Cu costs but larger raceway will be needed unless direct bury conductors.
Transformers are not all that cheap either, 300 feet is short enough it may not be worth using a transformer.
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cadpoint
Senior Member
- Location
- Durham, NC
I believe the electricain is trying to account as they should for the requirement of the service!
RV electricial requirements can come in both 30 and 50 amp service.
So will the owner be happy with their 30?
http://www.timberman.com/ELECTRIC/electric.htm
RV electricial requirements can come in both 30 and 50 amp service.
So will the owner be happy with their 30?
http://www.timberman.com/ELECTRIC/electric.htm
kwired
Electron manager
- Location
- NE Nebraska
So run one more conductor so you can have 240 volt as well as 120 volt. If you run 120/240 and only connect to a 30 amp 120 volt receptacle you still have the same voltage drop as you do with just 120 volts run out to the location. You will be able to run two RV's and balance the load if connected to 30 amp receptacles. One 50 amp RV will also be acceptable but start getting other combinations and you can have higher voltage drop.
stew
Senior Member
- Location
- federal way,washington
You might just price 2/2/2/4 al at Lowes or your local supplier. You might find, and I think you will, that this would be way cheaper than running #4 cu. Then you could make this a 60 amp 120/240 setup.
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