Assuming they are wanting to use a gauge of wiring that is appropriate. I assume that is why your electrician suggests an SO (common type of wire that can be buried) wire for this run. For a 120 foot run you’d want to use no smaller than a 7 AWG wire. You really want a low single digit voltage drop, so no more than say 2-3% is ideal. I used this online voltage drop calculator to figure out this voltage drop. Over a 120 foot run, assuming a 30-amp load (which would be the max your rig is capable of ‘using’ since it’s a 30-amp rig), we are talking around a 6% voltage drop. In the case of the extension cords reviewed on this page, the gauge of wire used is 10 AWG.
The problem is voltage drop over this long distance using the gauge of wiring that a 30-amp RV extension cord has. They really aren’t intended for this long of a run.
In fact, you’d have to use at least 2 RV extension cords to travel this distance. 🙂ġ20 feet is a really long distance to use an RV extension cord. There’s a reason why RVs come with a minimum of a 30 amp input. But you aren’t going to have too much luck running both at once (or with other 120 appliances) I hope you aren’t planning on running high energy use appliances in your RV via a 15 amp connection. A quick check of prices showed the Camco 25 foot 30 amp extension cord is as inexpensive, or even costs less, than the household specific ones on Amazon. Not sure why you would want to buy one of these instead of an RV specific one. If you could find a 10 gauge heavy duty, outdoor use household extension cord that is of high quality maybe you could get away with using it. I see that is may have a slightly smaller 15 amp end, but I seriously doubt you are going to gain any storage space using this dog bone over the Camco one. The Conntek 15200 (30 amp female to 15 amp male) dog bone would be a fine choice. Thanks for visiting and for the question! I assume you are wanting to put some sort of 120-volt patio lights around your RV? Why not just plug them into your RV’s external 120-volt power outlets that are being fed when your rig is plugged into the 30 amp outlet? Just keep in mind that when you plug a 50 amp RV into a 30 amp outlet you have to be very careful to limit the number of high power consuming devices at one time to not trip the power pedestal’s 30 amp circuit breaker. You can get this type of a setup going from a 50 amp power source to a 30 amp RV plug and a 15 amp household plug, but not the other way around. No manufacturer in their right mind would put out a product capable of this. In other words, you would be asking a 30 amp power source to supply up to 65 amps of power (50 amp + 15 amp). To ask the 30 amp power source to additionally supply a potential 15 amps of power (the standard household outlet that you want to run porch lights from) would mean a further potential power deficit. You are asking a 30amp power source to supply power to a 50 amp rig, so you are already running a potential power deficit. Not that I’m aware of and here’s my take on why. The Conntek looks like it would be difficult as well. With the original plug I also had a terrible time disconnecting it. I’ve looked at Home Depot, Lowes, Amazon, and internet searching and the one that looks promising is the Conntek 30 amp. The hatch is 2″ deep, 2.7″ ID and the hole in the side of the trailer is 3″.
The cord end must have flipped up and caught on the folded stair pretty quickly after the end sheared off as there is very little wear on the cable. At some point on our return home yesterday on a 240 mile trip, the cord wiggled out and the connector sheared right off. Upon returning home, I found the cord without a connector stuck on the folded stair with about 4 ft of cable protruding. The hatch lid had broken off years ago and the cord always stayed put…. The mini did not quite fit all the way into the hatch, the slight protrusion seemed ok. I replaced it with the Camco mini to ease unplugging. The plug pulled apart from the sheathing exposing the individual wires. The original plug looked like the one “Kelly” had in this article.
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