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# I have a single phase 30 amp 120 volt standard connector on…

Customer Question
I have a single phase...
I have a single phase 30 amp 120 volt standard connector on my RV.
The hydro pedestal is 200 feet from my RV.
I need a over the ground, extension cord
Preferably at 100 feet lengths times two to make 200 feet .What gauge of cable should I purchase and if possible how did you do the calculations please
Submitted: 5 months ago.Category: Electrical
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Answered in 2 minutes by:
10/4/2017
Electrician: Mike G., Master Electrician replied 5 months ago
Mike G., Master Electrician
Category: Electrical
Satisfied Customers: 8,090
Experience: Proven Professional 49 years Experience
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Customer reply replied 5 months ago
Ok
Customer reply replied 5 months ago
If you have suggestions on where to purchase is also appreciated
Electrician: Mike G., Master Electrician replied 5 months ago

You'll need a #4 copper wire to not exceed 3% Voltage Drop.

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Customer reply replied 5 months ago
What is the difference btwn copper vs aluminum? Should I consider aluminum too?
Electrician: Mike G., Master Electrician replied 5 months ago

Aluminum wire will.need to be larger and you wouldn't find it in an extension cord It would be a SEU cable

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Electrician: Mike G., Master Electrician replied 5 months ago

The calculation was done on a VD CALCULATOR.

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Customer reply replied 5 months ago
But #4 aluminum or copper do the same job right?
Electrician: Mike G., Master Electrician replied 5 months ago

In Aluminum you'll need a #2 conductor. Either size wire won't fit a plug or cord cap. You can splice a smaller wire #10 copper at the ends of the run.

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