This guide covers US-style AC shore power. For cigarette-lighter accessories, use our separate 12V extension-cord guide.
Some manufacturers prohibit extensions: the 2017 Jayco White Hawk manual does so in its 30A and 50A sections. Follow your own model’s instructions. If extensions are prohibited, move closer, request another site or ask the manufacturer about an approved longer supply cord.
Our RV extension-cord picks at a glance
These four choices solve different reach and handling problems. All extend an existing cord with a matching straight-blade plug; none is a locking replacement cord that connects directly to the RV inlet.
| Model and use | Ends and rating | Wire and trade-off |
|---|---|---|
| Camco 55191 30A, 25 extra feet |
TT-30P → TT-30R 30A / 125V |
10 AWG; cETLus per maker. Half the length of the 55197; even a small gap adds all 25 feet electrically. |
| Camco 55197 30A, 50 extra feet |
TT-30P → TT-30R 30A / 125V |
10 AWG; cETLus per maker. More reach, with more cable and voltage loss at the same load. |
| Camco 55194 50A, 15 extra feet |
14-50P → 14-50R 50A / 125–250V |
6/8 AWG as specified by maker; cETLus. Least added length for a measured short gap; less spare reach for future sites. |
| Southwire 50A30MFSE 50A, 30 extra feet |
14-50P → 14-50R 50A service |
6/3–8/1 SEOW; UL mark in maker catalog. Flexible TPE jacket; still 30 feet of cable to stow. |
Ratings and listing information come from the linked manufacturer records: Camco identifies cETLus, while Southwire’s FLEX50A catalog shows a UL Listed mark. Confirm the exact model and mark on the item you receive.
Match the end you are extending
With your equipment disconnected, look at the plug that normally goes into the campground pedestal. That is the plug the new extension’s female end must accept. Looking only at the RV’s wall inlet can send you toward a different kind of cord.
All views look straight into the socket openings. These simplified illustrations are not to scale; match the molded NEMA code and equipment instructions as well as the shape.
TT-30R
30A extension end
Two angled slots and a rounded ground opening. Accepts your existing TT-30P shore plug.
14-50R
50A extension end
Three straight slots and a rounded ground opening. Accepts your existing 14-50P shore plug.
L5-30R
Locking 30A example
Curved slots. On a compatible RV supply cord, this end mates with the locking inlet; it will not accept a TT-30P plug.
Reference patterns: Leviton’s TT-30R, 14-50R and L5-30R drawings. Locking 50A and proprietary inlet connectors have different patterns.
Add reach to the cord you already have
Replace the supply cord instead
Connection paths only, where your equipment instructions permit them. Protection devices are omitted for clarity. This is not a pin-wiring or installation diagram.
P identifies the male plug; R identifies the female receptacle or cord connector. A replacement shore cord’s RV end might be L5-30R, SS2-50R or a proprietary connector. Camco’s connector catalog, pages 212–213, illustrates both extension and inlet supply-cord configurations.
US 30A RV service is nominally 120V: 30 × 120 = 3,600 watts before load-planning allowances. Standard 50A RV service has two 120V legs, each limited to 50A. A thicker cord or adapter does not increase the available service. See our 30-amp appliance planner before adding loads.
What to look for before ordering
| Check | What it changes |
|---|---|
| RV instructions | Whether an extension is permitted at all, and any equipment-specific limits. |
| Both connector codes | TT-30 and 14-50 extensions accept the existing shore plug. A locking RV-inlet connector serves a different task. |
| Additional reach | Measure the route and usable shore-cord reach. Choose the shortest appropriate assembly that reaches without strain. |
| Whole-assembly rating | Match service, voltage, outdoor suitability and manufacturer instructions. A gauge number alone does not rate the entire cord. |
| Listing and exact SKU | Look for a documented laboratory mark for the selected item, not just vague “heavy duty” wording. |
| Handling and storage | Handles, jacket material and cable length affect setup. Do not mistake shipping weight for cord weight. |
AWG describes wire size; a lower number means a thicker conductor. Southwire’s 6/3–8/1 notation means three 6-AWG wires and one 8-AWG wire. Camco lists the 55194’s construction more briefly as 6/8 gauge.
The Electrical Safety Foundation’s cord guidance supports checking outdoor suitability, ratings, condition and independent laboratory approval. Use the complete RV cord assembly’s rating; a household extension-cord chart is not a substitute.
Camco Power Grip 55191: 30A when 25 extra feet is enough
Choose the 55191 over the longer 55197 when your measured route fits: both use 10-gauge wire and carry a 30A rating, but this model puts 25 fewer feet of cable in the run. Its handled TT-30 connectors and documented cETLus rating make it a straightforward starting choice for that task.
- Half the cable length of the 55197 to deploy and store.
- Handles provide a grip on the connectors without pulling the cable.
- Even a small shortfall adds the full 25 feet to your electrical run; unused slack does not reduce voltage loss.
Skip it if: a shorter approved cord already reaches, or your measured route requires more than 25 additional feet. Do not buy it with the intention of adding another extension later.
Camco 55191 specifications: 25 feet, 30A, 125V, 10 AWG; maker identifies cETLus.
Camco Power Grip 55197: 30A when you need 50 extra feet
Choose the 55197 when the route genuinely exceeds a 25-foot extension and your equipment instructions allow the longer setup. It retains TT-30P/TT-30R connectors and 10-gauge wire. The reason to buy it is reach, not greater electrical capacity than the shorter 55191.
- One 50-foot extension can cover a gap that a 25-foot model cannot.
- Power Grip handles help with disconnecting the plugs.
- Twice the extension length to deploy and store.
- More resistance than 25 feet of the same wire, increasing voltage loss at the same current.
Skip it if: parking closer makes a shorter cord work, or the site already has a low-voltage problem. Extra cable does not correct weak campground power.
Camco 55197 specifications: 50 feet, 30A, 125V, 10 AWG; maker identifies cETLus.
Camco Power Grip 55194: 50A for a short gap
For a known short gap on a 50A hookup, choose the 55194 over the 30-foot Southwire. Both extend a 14-50 shore plug, but the Camco adds only 15 feet to the run and storage bay. It suits an owner who has measured the shortfall and does not need the longer model’s extra placement flexibility.
- 15 fewer feet to deploy and store than the Southwire pick.
- Power Grip handles on a documented 50A, 14-50 extension.
- Less spare reach for changing campsite layouts than the 30-foot option; a poor fit for buying ahead of an unknown long gap.
Skip it if: you regularly need more than 15 additional feet. Measure the route first so this does not become the first of several chained extensions.
Camco 55194 specifications: 15 feet, 50A, 125/250V; maker lists 6/8-gauge construction and cETLus.
Southwire FLEX50A 50A30MFSE: 50A when you need 30 extra feet
Choose this when the 15-foot Camco cannot cover your measured 50A gap. Southwire’s flexible thermoplastic elastomer (TPE) jacket is an additional handling benefit: the maker describes it as staying flexible in warm and cold conditions. That makes the cord relevant to ordinary longer hookups as well as cold-weather trips.
- Twice the additional reach of the 55194 in one extension.
- Documented TPE jacket for flexible handling, plus an Easy-T-Pull handle.
- All 30 feet remain in the electrical run and must be stowed, even when you only need a few extra feet.
Skip it if: 15 feet is enough and cable handling is not a problem. Buy 50A30MFSE, with male and female ends, rather than 50A30MOSE, which has a stripped end for installation.
Southwire’s model page and Transportation Catalog, page 27: 30 feet, 50A, 14-50 ends, 6/3–8/1 SEOW. The maker shows a UL Listed mark for this family.
Choose extra reach, then count the whole run
- Lay out the intended route. Measure along the ground where the cable can actually run, allowing gentle bends and slack at connections. Do not plan a taut diagonal across a walkway.
- Subtract the usable reach of your existing shore cord. The remaining distance is the additional reach you need, subject to your equipment’s instructions.
- Choose the shortest suitable extension that covers that gap. Then count its entire length plus the entire existing cord when assessing the electrical run.
Assume your RV permits an extension. Your existing shore cord is 25 feet long, but only 23 feet is usable along the route. You measure a 33-foot route, including bends and connection slack, and confirm matching 14-50 equipment.
- Find the gap: 33 − 23 = 10 extra feet needed.
- Choose by fit: the 15-foot Camco 55194 covers that gap with room to lay it out without strain. The 30-foot option adds unnecessary length here.
- Count all connected cable: 25 + 15 = 40 feet, including cable that does not contribute usable reach.
This selects a length and connector configuration. Supply voltage, load and equipment limits still determine whether the setup is suitable electrically.
For the same wire and current, more length means more voltage loss; higher load and poor connections can make the situation worse. Southwire’s cord guidance explains the shorter-cable, larger-conductor principle. There is no universal “50 feet is safe” answer based on the amp label alone: supply voltage, total run and appliance requirements matter.
A measured shortfall above 50 feet on 30A or 30 feet on 50A exceeds this shortlist. Those are the limits of these recommendations, not universal safe-length limits. Reposition, request another site or ask about an approved longer supply-cord solution; do not plan to chain these extensions.
Keep your existing cord if it already reaches without strain and passes inspection. For recurring long gaps, discuss the site layout and supply-cord options with the campground and RV manufacturer before ordering.
A cord does not provide voltage protection
An indicator light shows a cord is energized; it does not establish correct wiring or acceptable voltage under load. For automatic high/low-voltage disconnection, check the exact device’s functions, such as those specified in the Progressive Industries EMS manual. Our RV surge-protector and EMS comparison covers those separate devices.
A voltage display at the pedestal is upstream of the extension and shore cord. It does not measure the additional loss between that point and the RV. Use your RV’s installed monitoring equipment as directed, and have persistent low voltage or connection faults assessed before continuing with heavy loads.
Include charging loads when planning power use. The RV converter draws shore power to supply DC loads and charge batteries; an extension does not create extra room for the air conditioner, water heater or microwave.
Can you use an adapter or a household extension?
An adapter changes which connectors mate. It does not turn a household circuit into 30A RV service or give a 30A pedestal the capacity of 50A service. Follow the RV and adapter instructions, and plan for the lower supply limit.
A household extension rated below your intended RV load is not a substitute for one of these assemblies. A reduced-power connection for limited tasks is a separate setup, with its own outlet, cord and equipment limits. Never force incompatible plugs or remove a grounding pin.
Check the connection before applying power
- Inspect while disconnected. Look for damaged insulation, loose or damaged connectors, discoloration and bent or missing pins. Replace damaged equipment; an extension cannot repair the existing shore cord.
- Follow the hookup sequence in your manuals. Switch the supply breaker off before making or breaking the connection. Fully seat compatible plugs and use the handles, not the cable, to unplug.
- Deploy the cable for use. Follow the manufacturer’s uncoiling instructions. Keep it clear of traffic, pinching and standing water; an outdoor-rated jacket does not make the plug junction submersible.
- Stop at warning signs. Burning odor, unusual heat, intermittent power or repeated protective trips call for disconnection and investigation, not another adapter or repeated resets. Have a damaged pedestal checked by campground staff.
If the installation requires new wiring, connector replacement or diagnosis of an unsafe supply, use a qualified RV technician or electrician. More guides to ordinary load planning and RV electrical equipment are in our Power section.
How we chose these cords
We compared manufacturer specifications, exact connector configurations, cable construction and listing evidence. Camco’s documented 25- and 50-foot 30A models let you choose reach while keeping the same gauge and rating. Its 15-foot 50A model fills a short-gap role; Southwire adds a 30-foot option with a documented flexible TPE jacket.
These are recommendations by fit and published specifications, not hands-on performance rankings. We excluded locking inlet supply cords, bare-ended replacements and variants whose rating details remained unresolved. Each pick has a specific job; the table does not rank them by durability or price.
- Confirm your RV allows this setup and your existing cord actually needs extending.
- Match the exact SKU, male plug, female connector and length—not just the words “RV cord.”
- Check the selected variant and seller. Amazon buttons here search by model; results may include different lengths or connector types.
