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Old 12-30-2012, 08:59 AM   #21
John Shaw
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Agw?

I've never heard of AGW. I actually think you are talking about AWG which stands for American Wire Gauge.

Also the one post talked about running three wires and driving a ground rod at the outlet. You can only do that if you put a disconnect there and reestablish ground and bond the neutral to the ground. The NEC is very specific in stating the earth shall not be the sole means of equipment ground.
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Old 05-21-2022, 03:13 AM   #22
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[Edit: The post this replies to is no longer there. I guess the mods agreed it was spam and removed it.]

There are so many gotchas in this post.

The link isn't to Amazon. The product at the link doesn't have a twist-lock connector, at least not as pictured. Its gauge is 6/8, not 12 (which would be vastly undersized). The manufacturer rates it at 50A not 15, which would be ludicrous for a "50 amp cord." The "100ft extension cord" sold there is really a three-pack of their 36ft cord.

"so you can plug into any standard outlet without worrying about whether it's female or male" makes zero sense. Neither does "you can leave it outside all year long. This will help prevent corrosion and rusting of the metal parts in the weather." (Leaving it inside would always be better than outside.)

Finally, the wattage math is wrong, as a 50A cord carries 240V (2 circuits x 120V), but wattage isn't a useful parameter for a trailer anyway.

Add to all this the observation that it's the poster's first post, and my conclusion is: spam.
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Old 05-21-2022, 04:05 AM   #23
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Originally Posted by LHaven View Post

"so you can plug into any standard outlet without worrying about whether it's female or male" makes zero sense. Neither does "you can leave it outside all year long. This will help prevent corrosion and rusting of the metal parts in the weather." (Leaving it inside would always be better than outside.)
I can't answer this question because I am not a biologist.
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Old 05-21-2022, 08:56 AM   #24
Carl n Susan
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This is a 10 year old post.
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Old 05-21-2022, 10:36 AM   #25
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Originally Posted by JRTJH View Post
Using the calculated voltage drop, here's the actual figures:

6/3 AGW wire, at 125 ft distance carrying a total 50 Amp load with an input voltage of 120 VAC single phase would deliver (at the terminal plug) 114.992 volts AC. the total voltage drop would be 5.078 volts (well within the acceptable range for RV use)

4/3 AGW at the same distance carrying the same load would provide 116.807 volts with a total voltage drop of 3.192 volts.
Industry design standard is 5% drop from the service entrance, which includes the 2% from service to the panel and 3% for the feeder. If you're pulling from the panel, which is also the service, then you're probably ok using the whole 5% on the run.

That said, voltage drop fries motors. Motors are typically rated at 115v and the service is likely closer to 130v.

I believe the 50A plugs are 240v, not 120, so you're even better off there. That said, southwire has an online calculator that you can use.
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Old 05-21-2022, 11:36 AM   #26
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Originally Posted by Carl n Susan View Post
This is a 10 year old post.
Yeah! Was wondering about that myself. LHaven bored and doing a late night forum archive deep dive!
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Old 05-21-2022, 11:37 AM   #27
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This is a 10 year old post.
Actually, the post to which I was replying was made just yesterday. Looks like the mods agreed it was advertising spam and removed it. You probably never saw it.
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Old 05-21-2022, 11:58 AM   #28
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Actually, the post to which I was replying was made just yesterday. Looks like the mods agreed it was advertising spam and removed it. You probably never saw it.
Yep, must be right. I was wondering about the links you mentioned.
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Old 05-21-2022, 12:32 PM   #29
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Originally Posted by solv3nt View Post
Industry design standard is 5% drop from the service entrance, which includes the 2% from service to the panel and 3% for the feeder. If you're pulling from the panel, which is also the service, then you're probably ok using the whole 5% on the run.

That said, voltage drop fries motors. Motors are typically rated at 115v and the service is likely closer to 130v.

I believe the 50A plugs are 240v, not 120, so you're even better off there. That said, southwire has an online calculator that you can use.
Just to clarify, the 50 amp rv service is 2 lines of 120 vac each. You can use both lines to get 240 vac but nothing in a Keystone trailer is wired for 240 v that I'm aware of.
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