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Old 03-18-2016, 02:01 PM   #1
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Twist lock extension cord ?

Hi,
I'm in need of a 30A extension cord for a big trip this summer ("just in case").
All of the extension cords that I've seen go between the plug end of the existing cord and the supply post, with mating plug/socket.
While these would work just fine, it bothers me that there's nothing covering the mating surfaces of where the normal supply cord plugs into the extension cord.

I was wondering if there are any extension cords that use the same twist-lock connector that connects the supply cord to the camper ?
So you'd plug (and twist lock) the extension into the camper, and then connect the other end to the normal supply cable (which would also make use of the twist-lock connectors), and then just plug the normal cable into the supply post.

Seems that with the twist-lock connectors it would all be much more secure, and rain resistant.

Hope that makes some sense
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Old 03-18-2016, 02:08 PM   #2
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If you want to keep the connection off the ground and water proof just use a 5 gal pail. Cut holes on opposite side and plug in cord turn bucket upside down now your cord is off the ground and out of the weather (easy fix).
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Old 03-18-2016, 02:22 PM   #3
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Quote:
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If you want to keep the connection off the ground and water proof just use a 5 gal pail. Cut holes on opposite side and plug in cord turn bucket upside down now your cord is off the ground and out of the weather (easy fix).
Nice "hack"
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Old 03-18-2016, 02:24 PM   #4
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This is *almost* what I was thinking of
Amazon.com : Marinco 50SPP PowerCord PLUS Marine Electrical Power Cordset (30-Amp, 50-Feet) : Boating Shore Power Cords : Sports & Outdoors

except that it doesn't look like the socket end would latch with the lock from the existing cord

I believe I'd basically need a NEMA L5-30P to NEMA L5-30R male to female extension cable with Hubbell twist lock on both ends of the cable (one locking ring, one locking receptacle). Perhaps such a thing doesn't exist for some strange reason
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Old 03-19-2016, 07:46 AM   #5
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Use the regular 30 amp extension cord......I have done it before.....dialectic grease on the prongs........then wrap it with duct tape...had mine on a piece of short 2x6 board for 4 months....with no problems
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Old 03-19-2016, 11:26 AM   #6
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Use the regular 30 amp extension cord......I have done it before.....dialectic grease on the prongs........then wrap it with duct tape...had mine on a piece of short 2x6 board for 4 months....with no problems
Actually if you look up dielectric grease you will find it is a NON conductor. Best product to use is Noalox.
Ideal NOALOX 4 oz. Anti-Oxidant Compound-30-026 - The Home Depot
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Old 03-19-2016, 11:32 AM   #7
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If what you want is twist lock,,, go to your local Ele Supply House,,, they will have several different twist lock connecters !!! You may want to take your cord with you to make sure you get the right one !!!
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Old 03-19-2016, 11:49 AM   #8
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Quote:
Originally Posted by leefl View Post
This is *almost* what I was thinking of
Amazon.com : Marinco 50SPP PowerCord PLUS Marine Electrical Power Cordset (30-Amp, 50-Feet) : Boating Shore Power Cords : Sports & Outdoors

except that it doesn't look like the socket end would latch with the lock from the existing cord

I believe I'd basically need a NEMA L5-30P to NEMA L5-30R male to female extension cable with Hubbell twist lock on both ends of the cable (one locking ring, one locking receptacle). Perhaps such a thing doesn't exist for some strange reason
That is the same cord I use for my Rockwood Roo, except I think mine is 75 ft.
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Old 03-19-2016, 12:39 PM   #9
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I use a Marinco adapter. It has the 50 amp twist connector for the trailer on one end and a 30 amp rv plug on the other. It is about a foot long. Works great. Use it with a 25 foot 30 amp rv extension cord. Saves dragging out the big cord. I use it for all 30 amp hookups.
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Old 03-19-2016, 12:45 PM   #10
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You can get twist locks at electrical supply houses but there is really no need.

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Old 03-20-2016, 09:53 AM   #11
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You may have to add the twist lock end yourself which is no big deal if you can find one that would work inline like you want to do.

An alternative would be to buy an entire longer cable which would give you 100% redundancy. IMO, that's the best most reliable option. Put it under the seat of the truck and hope you don't have to use it. I only had one occasion that I almost needed more than 25' length. A state park had all the electrical post on the wrong side.

You can always limp by with a regular heavy duty extension cord till you can run in to the nearest RV supply to get a replacement.

IMO, I wouldn't worry about the weather exposure but you can cover it as mentioned or wrap it in a garbage bag. My cord is plugged in 24/7 to the side of my house and has never had issues. You can actually see the prongs, so it's far from weather proof.
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Old 03-20-2016, 10:10 AM   #12
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Originally Posted by bob213 View Post
Actually if you look up dielectric grease you will find it is a NON conductor. Best product to use is Noalox.

Ideal NOALOX 4 oz. Anti-Oxidant Compound-30-026 - The Home Depot

The reason for dielectric is so it doesn't leak current between the prongs.



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Old 03-20-2016, 10:25 AM   #13
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I have two 50 foot marinco cords for boats like the one above . You will also need a collar and ring to make it watertight. As on this website.

Marinco Sealing Collar with Threaded Ring, 30A Systems | Redden Marine Supply
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Old 03-20-2016, 10:00 PM   #14
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I ended up giving up and just getting a regular 30A extension cord.
I'll use some dielectric grease between the connectors to prevent sorts due to water ingress (since it is indeed an insulator) and some PPE (polyphenyl ether is great as a conductive contact cleaner) on the contacts, and just keep it off the ground and covered.
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Old 05-17-2016, 08:08 AM   #15
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I see where there are locks to protect people from steeling surge protectors. It seems like if the surge protector was on the end of an extension, someone could steel the extension WITH surge protector. I just bought my RV this weekend so still learning...but is there a gadget one can buy to prevent someone from unplugging at the point where the extension is plugged in?
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Old 05-17-2016, 08:30 AM   #16
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I attached aircraft Cable and use pad locks. Put a piece on each end, use crimps and put shrink over the ends to prevent scraps from the wire cable ends. I added the shrink after photo was taken.

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Old 05-17-2016, 09:18 AM   #17
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The one from Progressive industries comes with a metal ring so you can lock it directly to the post.

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Old 05-17-2016, 11:54 AM   #18
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Thanks for the response!
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