Best Buying Guide for Generator Cord - Kohree

All You Need to Know Before Buying a Generator Cord

Generator cords are a vital link in powering appliances, equipment, or even an entire household through a portable generator. Available in various forms and dimensions, these cords cater to diverse operational requirements. Familiarity with the different categories of generator power cables and their respective applications is crucial to selecting the most suitable cable for your particular generator and energy requirements. This article aims to guide you through an in-depth exploration of the various types and uses of these cords, facilitating your quest to find the perfect match for your generator's needs.

Understanding the Power Requirements

Before diving into the details of generator cords, it's essential to grasp your appliance power needs. This foundational knowledge will guide you in selecting the appropriate cord that can handle the electrical load without overloading the system.

To accurately determine your house power requirements, you'll need to consider the combined wattage demand of the appliances and devices you plan to run simultaneously. Air conditioning units, electric water heaters, and microwaves are notorious energy guzzlers, while smaller appliances like televisions and laptops have lower wattage demands. By tallying up the wattage ratings of your essential items, you can ensure that your generator cord can handle the load without tripping circuit breakers or causing potential electrical hazards.

Find Out the Generator Cord Specifications

Once you've calculated your appliance power needs, it's time to dive into the generator cord specifications. These specifications will serve as your compass, guiding you toward the perfect cord that meets your rig's unique requirements.

Amperage Ratings: Understanding Amps and Power Draw

Amperage ratings are at the heart of generator cord selection. These ratings indicate the maximum electrical current the cord can safely handle without overheating or posing a fire risk. Commonly available options range from 30 amps to 50 amps, with the latter being suitable for high-power applications and larger RVs.

Voltage Variations: 120V vs. 240V

In addition to amperage ratings, voltage is another crucial factor to consider. Most appliances or RVs operate on either 120V or 240V systems, with some models offering dual-voltage capabilities. Ensure that the generator cord you select is compatible with your appliance and RV's voltage requirements to avoid potential compatibility issues or electrical hazards.

Gauging the Gauge: AWG and Its Significance

The American Wire Gauge (AWG) system is used to measure the thickness of the conductive wires within a generator cord. Lower AWG numbers indicate thicker wires, which can handle higher amperage loads more efficiently and with less voltage drop. For optimal performance and safety, select a generator cord with an appropriate AWG rating based on the amperage and length requirements.

Length Matters: Choosing the Right Cord Length

While a longer generator cord may seem convenient, it's crucial to strike a balance between length and efficiency. Excessively long cords can result in voltage drops and power losses, potentially compromising the performance of your appliances and electronics. Opt for the shortest cord length that meets your needs while ensuring optimal power transfer and minimizing energy waste. You can see the table below for reference:

Device Requirements

Wire Gauge by Length (ft.)


Watts (120/240V)

10 ft.

25 ft.

50 ft.

100 ft.

150 ft.



12 AWG

10 AWG

10 AWG

10 AWG




10 AWG

10 AWG

10 AWG

















*Gauge based on twisted copper

What Generator Cord Types Should I Choose?

The Generator extension appliance cord is the key equipment to connect the generator and various appliance. Each is designed with specific power requirements and compatibility in mind. The generator power extension cord is the key equipment to connect the generator and various equipment. Mastering the following points ensures a seamless connection between your generator and your house's electrical system.

Standard NEMA Configurations for Residential Use

NEMA, the National Electrical Manufacturers Association, has established a series of standard configurations that dictate how electrical plugs and receptacles are designed and used. In households, these standards are crucial for providing a uniform and safe means of connecting electrical devices. The most prevalent NEMA types in residential applications include:

  • NEMA 1: Enclosures for indoor use to protect against dust, dripping, and falling drips.
  • NEMA 5-15: The standard household plug, offering 15 amps of power with two flat prongs and a round grounding prong.
  • NEMA 6-15: Similar to NEMA 5-15 but with a slightly different grounding pin, often used in heavy-duty appliances.
  • NEMA 6-20: Designed for higher power applications, featuring a 20-amp capacity with a unique grounding configuration.

Twist-Lock vs. Straight-Blade Connectors

When it comes to the physical interaction between plugs and receptacles, twist-lock and straight-blade connectors serve distinct purposes:

  • Twist-Lock Connectors: These connectors offer a secure connection that requires a twisting motion to lock into place. They are often used in outdoor power equipment and heavy-duty applications where a reliable and tamper-resistant connection is essential. Twist locks prevent accidental disconnections, making them ideal for situations where vibration or movement might occur.

    Kohree 50 amp twist lock generator cord

  • Straight-Blade Connectors: More common in indoor settings, straight-blade connectors provide a straightforward plug-and-play experience. They are typically found in standard household appliances and are characterized by their ease of use and quick disconnection capability.

Ensuring Compatibility with Appliance Inlet and Generator Outlet

Ensuring that your appliance inlet and generator outlet are compatible is a critical step in any electrical setup. Incompatibility can lead to a range of issues, from reduced performance to potential safety hazards. Here's how to guarantee compatibility:

  • Check the NEMA Rating: Every connector has a specific NEMA rating that indicates its amperage and voltage capabilities. Match your appliance's inlet rating with the generator's outlet rating for optimal performance.
  • Inspect the Physical Configuration: Beyond the NEMA rating, the physical configuration of the connector must align. This includes the number and shape of the prongs, as well as any twist-lock mechanisms.
  • Consider the Application: Different applications may require different connector types. For instance, a twist-lock connector might be necessary for a generator providing power to an RV, while a straight-blade connector would suffice for a home appliance.
  • Consult a Professional: When in doubt, consult with an electrician or a professional in the field. They can guide the best connector types for your specific needs and ensure that all installations are up to code.

How to Select the Right Generator Cord

While selecting the right amperage rating and connector type is crucial, it's equally important to consider the construction and durability of the generator cord itself. After all, your cord will be exposed to the elements and subjected to the rigors of life on the road, making durability a paramount concern.

Choosing Longevity and Safety Insulation

The insulation layer surrounding the conductive wires is not just a protective barrier; it's a critical component for safety and the cable's overall lifespan. Opt for cords with insulation crafted from materials that are rated for outdoor use. Thermoplastic elastomer (TPE) and thermoplastic polyurethane (TPU) stand out for their resilience against extreme temperatures, UV rays, and humidity, making them ideal choices for outdoor applications.

Outdoor vs. Indoor Use

Contrasting with cords tailored for indoor applications, those designed for outdoor use come with an added layer of protection. Seek out cords that boast a weather-resistant design, featuring jackets or sheaths that safeguard against the penetrating effects of moisture, relentless sunlight, and other environmental stressors.

Flexible vs. Stiff Cords

The portability and ease of storage of a generator cord are significantly influenced by its flexibility. Cords with a higher degree of flexibility are generally more convenient to coil and store, which can be a deciding factor for users with limited space. However, less flexible cords may provide superior durability, being less prone to kinking or bending, which can weaken the cord over time.

What Should I Pay Attention to Generator Cord

Dealing with electricity requires utmost caution and adherence to safety protocols. When it comes to using a generator cord for your RV, safety should be your top priority. Overlooking even the slightest detail can lead to potentially hazardous situations, putting your RV, belongings, and even your life at risk.

A Strategy for Prevention Electrical Risks

The potential for electrical mishaps, such as shocks or fires, is ever-present when handling generator cords. To preemptively address these dangers, conduct a thorough inspection of your cord prior to each use. Look out for physical damage including cuts, frays, and any exposed wiring. Beyond visual checks, make certain that your cord is equipped with a grounding mechanism and includes a ground fault protection feature. This latter component is a critical safety device, capable of detecting electrical anomalies that could lead to a ground fault, thereby averting possible electrical shocks.

Proper Grounding and Ground Fault Protection

Grounding is a fundamental aspect of electrical safety, providing a path for electrical current to be safely diverted in the event of a fault. Verify that your generator cord is furnished with an appropriate grounding conductor or a dedicated grounding wire. This wire must be accurately connected to a reliable grounding source. Furthermore, integrating Ground Fault Circuit Interrupters (GFCIs) into your setup adds an extra layer of security. GFCIs are designed to identify and interrupt electrical flow in the event of a ground fault, thereby substantially reducing the risk of electrical shocks.

Handling and Storage Guidelines

The longevity and safety of your generator cord are heavily influenced by how it is handled and stored. Aggressive handling, such as kinking or twisting, can damage the cord's internal structure and diminish its performance. To maintain the cord's integrity, exercise care during use and when winding it for storage. Select a storage location that is cool and dry, out of reach of dir, sunlight, and free from potential hazards. Adhering to the manufacturer's guidelines for winding and storing will further extend the life of your cord and uphold the safety of your electrical system.

How to Install the Generator Cord into the Generator Inlet Box?

  • Select & Install Inlet Box:

    Choose a waterproof generator inlet box rated for your generator's amperage (30A or 50A typically). Mount the box securely on an exterior wall near your home's electrical panel, ensuring it's easily accessible yet shielded from direct weather. Drill a hole for the cable, feed it through, and seal any gaps around the cable entry with a waterproof sealant to prevent moisture ingress.

    Select and install the generator inlet box

  • Measure & Choose Generator Cord:

    Measure the distance between the inlet box and where you plan to place your generator (ensuring it's at least 20 feet from any doors or windows to avoid carbon monoxide risks). Based on this measurement and your generator's amperage, purchase an outdoor-rated, heavy-duty generator cord with the correct AWG size to handle the current safely.

    Connect the wires to one end of the electrical box

  • Wiring Inside the Electrical Panel:

    With the main power off and adhering to local codes, wire the inlet box cable to a matching double-pole breaker in your electrical panel. Connect the ground wire to the ground bus bar, the neutral wire to the neutral bus bar, and the hot wires to the breaker terminals. Tighten all connections securely and consider professional assistance if you're unsure about electrical work.

    Connect the engine power cord to the outlet following the proper instructions

  • Installing a Circuit Breaker (If You Require Maximum Power Output)

    When needing the maximum power capacity (over 50 amps), a circuit breaker becomes essential. It not only enables effortless control of the power supply but also safeguards against power surges. If you have a surge protector, it can be utilized as well. Depending on your specific setup, connect the neutral and ground wires accordingly, tightening them securely. Afterward, insert the black and red wires from the cable into the bottom of the circuit breaker and afterward fasten them with screws. Finally, mount the circuit breaker onto the bracket inside your electrical panel to complete the installation process.

    Installing a circuit breaker on the electrical box

  • Install Interlock Kit:

    To prevent backfeeding, install an approved interlock kit on your main breaker. This device ensures the main breaker cannot be turned on while the generator is connected and supplying power, avoiding potential hazards. First, you need to drill the necessary holes for your interlock kit and install the cross screws on the front. Afterward, reattach the prepared electrical box cover back onto the electrical box.

    Install interlock kit on the circuit breaker

  • Connecting the Generator Cord:

    Connect one end of the generator cord to your generator's outlet receptacle, ensuring a secure fit. Then, route the other end of the cord through the inlet box's opening and plug it into the inlet box's receptacle, again checking for a snug connection.

    Connect the generator cord between generator and electrical box

  • Proper Cable Management and Routing:

    Proper cable management and routing are essential for safe and efficient operation. Avoid running the generator cord across high-traffic areas or under doors, as this can create trip hazards and potentially damage the cord. Instead, route the cord along walls or use cable ramps to protect it from foot traffic and vehicles.

  • Power Up Safely:

    Before starting the generator, ensure all non-essential appliances and electronics are unplugged or switched off inside your home. Start the generator and allow it to stabilize before flipping on the double-pole breaker in your electrical panel. This will supply power from the generator to the circuits you've designated via the interlock system. A simple "Green on" signals a successful link, enhancing safety and visibility during nighttime installations or in dimly lit areas.

    Check the green light for safety connection

Kohree Power Inlet Boxes

Looking for a reliable and weather-resistant power inlet box to keep your home powered during power outages?

Check out our Kohree 30 Amp Generator Inlet Box. This ETL-certificated PB30 30 Amp NEMA 3R power inlet box is designed to provide and maintain a continuous backup power supply from your generator outside, especially during bad weather like tornadoes and blizzards. Suitable for most appliance applications.

Kohree 30 amp generator inlet box

You can choose this 50 amp generator inlet box option to meet the maximum power requirements for your entire house's appliances: This PB50 50 Amp CS6375 NEMA 3R power inlet box, is rated at 125/250V with a powerful capacity of 12,500W. It pairs perfectly with all 50 Amp 3-prong NEMA SS2-50P generators and compatible power cords. The 3.1-inch extension space allows for easy placement of the generator power cord and improves internal heat dissipation.

Kohree 50 amp generator inlet box

Select the Best Generator Cord From Kohree

Kohree 30 amp generator cord is the perfect solution for powering your generator with ease and confidence. This high-conductivity cord is perfect for long-term use without any risk of overheating. This generator cord is an essential item for anyone who wants to ensure that they have a reliable emergency electric extension cord for their generator.

30 amp generator cord plug in generator

All-Weather Resilience: Equipped with a secure twist lock male plug, this generator power cord maintains a steadfast connection, unfazed by extreme weather such as hurricanes, heavy rainfall, or dense snowfall.

Weather resistance generator cord

Twist Lock Security: Built with a robust L14-30 twist lock connector, this heavy-duty power cord is engineered to prevent accidental disconnections, ensuring a steadfast hold for utmost safety during operation.

Twist lock generator extension cord

Premium Construction & Certified Safety: Our 30 Amp generator power cord is ETL certificated. It features a four-prong construction using pure copper wiring. It's enveloped in a durable, flame-retardant, heat-resistant PVC jacket, further enhanced with water-resistant molded plugs for added protection.

Premium construction and certified safety generator cords

Optimized Electrical Transmission: Boasting a 10 gauge cable capable of handling 30A at 125/250V, up to 7500W, this cord offers exceptional conductivity, effectively preventing overheating even with prolonged usage. It's a dependable emergency extension cord for your generator needs.

Versatile 20 ft / 40 ft Extension: Included is a cable organizer, facilitating neat and efficient storage. The 20 ft / 40 ft opt reach allows for flexible placement, ensuring a safe distance between users and the generator's potentially hazardous exhaust emissions.

Conclusion: Empowering Your Power Journey

Armed with the knowledge and insights from this comprehensive guide, you're now equipped for power-packed adventure with confidence. Embrace the freedom of the open road, secure in the knowledge that your generator cord is up to the task, providing a reliable and seamless power supply for all your appliance needs. With the right generator cord by your side, you can focus on creating unforgettable memories and embarking on new adventures, one mile at a time.


What is the difference between a 30-amp and a 50-amp generator cord?

The primary difference lies in their amperage ratings and load-handling capabilities. A 30 amp generator power cord is designed to handle lower electrical loads, typically suitable for smaller RVs or those with modest power demands. In contrast, a 50 amp generator power cord is built to handle higher amperage loads, making it ideal for larger rigs with energy-hungry appliances like air conditioners and electric water heaters

Can I use a regular extension cord with my RV generator?

It is generally not recommended to use a regular extension cord with your RV generator. Regular extension cords are designed for indoor, and temporary use and may not be suitable for the higher electrical demands and outdoor conditions associated with RV generators. Instead, it's advisable to use a generator cord specifically designed for outdoor use, with appropriate amperage ratings, voltage capabilities, and weather-resistant insulation.

How do I ensure my generator cord is compatible with my RV's power inlet?

To ensure compatibility, you need to match the connector type on your generator cord with the power inlet on your RV. Common connector types for RVs include NEMA TT-30P (for 30-amp systems) and NEMA 14-50P or CS6364 (for 50-amp systems). Consult your RV's owner's manual or seek guidance from an RV specialist to determine the correct connector type for your specific rig.

What is the importance of proper cable management when using a generator cord?

Proper cable management is crucial for safety and efficient operation. Improperly routed or exposed generator cords can create trip hazards, become damaged by foot traffic or vehicles, or be subject to environmental factors like moisture or sunlight. Proper cable management involves carefully routing the cord along walls, using cable ramps, and avoiding high-traffic areas to minimize potential risks and ensure the cord's longevity.

How often should I replace my generator cord?

The replacement schedule for your generator cord largely depends on its usage, environmental conditions, and the manufacturer's recommendations. As a general guideline, it's advisable to inspect your cord regularly for signs of wear, such as cracks, frays, or discoloration. If any damage is detected, replace the cord immediately. Additionally, follow the manufacturer's recommended replacement schedule, which may vary based on factors like cord construction, insulation materials, and usage patterns.

What safety precautions should I take when using a generator cord?

Safety should always be the top priority when working with electrical equipment. Some essential safety precautions include:

  • Ensuring proper grounding and ground fault protection for your generator cord and RV electrical system.
  • Inspecting the cord for any signs of damage before each use and replacing it if necessary.
  • Avoid running the cord across high-traffic areas or under doors to prevent trip hazards and damage.
  • Following the manufacturer's instructions for proper setup, use, and storage of the generator cord.
  • Consider the use of surge protectors and power management systems to safeguard your RV's electrical system from voltage fluctuations and surges.

By implementing these safety measures, you can minimize the risk of electrical hazards and ensure a safe and enjoyable RV experience.

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