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Old 09-05-2016, 06:23 PM   #1
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50 amp to 30

Howdy, I have 250' of 30 amp 8 gage,
Cord, my RL 26 is 30 amp. I'll be using about 200 ft of that cord, so if I adapt to a 50 plug at the pole, and I'm using a Progressive exterior surge protector, will I be alright?
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Old 09-05-2016, 06:28 PM   #2
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50 Amp is 4 wire, 30 Amp is 3 wire.

Exactly what are you trying to do? Just being able to plug into a 50 Amp outlet in order to feed a 30 amp RV?
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Old 09-05-2016, 09:21 PM   #3
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Thanks, for 13 days, we camp about 200' away from the pole which has 30, 50, and 20 amp receptacles. I'm thinking, with the voltage drop per 100 ft, if I used a four wire to three adapter, I'd have more power. What do you think? I sure don't want to overload. The city cranks up the volts for this event. Lots of campers.
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Old 09-06-2016, 02:24 PM   #4
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You're going to be cutting it really close, IF they keep the voltage up.

Plugging into a 50 amp adapter won't help you because the voltage is still going to be 120 volts.

200' of #8 awg at 120 volts & 30 amps will have a voltage drop of about 7.5 volts or about 6.5%.

Even if they bumped it to 130 volts, you're still looking at a 7.5 volt drop or almost 6%.

At 200' you really need at least a #6 wire size. That will give you about a 5 volt drop or 4%.
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Old 09-06-2016, 10:06 PM   #5
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Well, you can "Cheat" by using extra wires to compensate for a smaller gauge then is recommended for a specific distance run. BUT, you have to double ALL wires, not just the "Hot" line. That means two wires each for the Hot, the Neutral, and the ground. That is a total of 6 wires.

In the case that you describe, it would be possible for you to cut the 250' cable in half, then have a double run of 125'.

IMPORTANT: 50 amp 4 wire service is actually two legs of 120 volts each that CANNOT be tied together because the potential BETWEEN THE LEGS is actually 240 volts, just like a household service.

You also might consider an Autoformer voltage regulator. Info here:

https://www.amazon.com/30-Amp-3-600-...autoformer#Ask
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