How to Buy the Right Junction Box

Your Guide to buying the best junction boxes


A junction box is an essential component of an electrical system. It is used to connect and protect wires, as well as to provide an access point for maintenance and repairs. This buying guide will provide an overview of the different types of junction boxes, their features and benefits, and tips to help you choose the right one for your needs. With this information, you can make an informed decision about which junction box to purchase for your project.

Key features

  1. Size: Junction boxes come in a variety of sizes, from small to large, so it's important to consider the size of the box and how much space it will occupy.
  2. Amp Rating: The amp rating of the junction box should match the amp rating of the circuit that the box will be installed on.
  3. Material: Junction boxes are made from a variety of materials, including plastic, metal, and fiberglass. Consider the environmental conditions the box will be exposed to when choosing a material.
  4. Cable Entry: Make sure that the junction box you purchase has the right type of cable entry for the cables you will be using.
  5. Hazardous Location Listing: If the junction box will be installed in a hazardous location, make sure it has a hazardous location listing.
  6. Division Rating: The division rating of the junction box should match the division rating requirements of your application.
  7. Grounding: Make sure that the junction box you purchase is grounded properly to ensure electrical safety.
  8. Weather Protection: If the junction box will be exposed to weather, make sure it is rated for the appropriate type of weather protection.

See the most popular junction boxes on Amazon

Important considerations


  • Versatility: Junction boxes are incredibly versatile and can be used for a variety of different applications. They can be used as an in-line junction for connecting two or more lengths of cable, as an enclosure to protect electrical connections, or even as a way to branch off several circuits from a single source.
  • Durability: Junction boxes are highly durable, designed to withstand the weather and other elements. This makes them ideal for applications that require long-term reliability in harsh outdoor environments.
  • Easy Installation: Junction boxes are designed for easy installation. The boxes are pre-wired and ready to be connected to an electrical system with minimal effort.
  • Cost Savings: Junction boxes are relatively inexpensive compared to other electrical components, and they can save time and money when it comes to installing and maintaining the system.
  • Safety: Junction boxes are an important component of any electrical system and provide an extra layer of safety by protecting the wiring from damage and preventing short circuits.


  • Cost: Junction boxes can be expensive, depending on the quality and features.
  • Durability: Not all junction boxes are designed to be durable, so it's important to consider the material and construction of the box before making a purchase.
  • Ease of Installation: Depending on the complexity of the wiring, junction boxes can be difficult to install. Professional help may be needed if the box is too complex.
  • Size: Junction boxes come in various sizes, so it's important to make sure the box you're buying is the right size for your needs.
  • Environmental Conditions: Junction boxes may be affected by external conditions, such as humidity, temperature, or dust.

Best alternatives

  1. Conduit boxes - Provide protection from dirt, dust, and debris when installed in an electrical conduit system.
  2. Push-in connectors - Designed to provide a secure connection between a variety of electrical wires.
  3. Panel mount enclosures - Installed directly onto a wall, or to the inside of an electrical panel.
  4. Wire connectors - Used to connect multiple wires to a single point.
  5. Splitters - Used to direct two or more electrical wires in different directions.
  6. Terminal blocks - Used to connect two or more wires in a secure fashion.
  7. Waterproof connectors - Ideal for outdoor wiring projects, where resistance to the elements is necessary.

Related tools, supplies, and accessories

  • Screws/Bolts/Nuts/Washers - These are necessary for attaching the junction box to a wall or other surface.
  • Wire Connectors - Connectors can be used to securely connect wires to the terminals on the junction box.
  • Conduit Fittings - Conduit Fittings are used to secure the junction box to a conduit.
  • Gland Plates - Gland plates are used to seal the junction box to the wall, preventing dust and other particles from entering.
  • Cable Glands - Cable Glands are used to secure the cables to the junction box.
  • Labels - Labels are used to help identify the contents of the junction box.

Common questions

  1. What is a junction box? A junction box is an electrical enclosure used to protect and conceal electrical connections and wiring.
  2. What types of junction boxes are available? There are many types of junction boxes, such as outdoor, indoor, weatherproof, flush, and surface mount junction boxes.
  3. What materials are used to make junction boxes? Junction boxes are typically made of metal or plastic materials, with metal being the most common.
  4. What sizes of junction boxes are available? Junction boxes are available in a range of sizes, from small ones for low voltage wiring, to large ones for high voltage applications.
  5. What are the benefits of using a junction box? Using a junction box helps to improve the safety and reliability of electrical connections, as well as reduce the risk of fire and electric shock.
  6. What should I consider when selecting a junction box? When selecting a junction box, it is important to consider the size and type of box needed, the environment it will be used in, the type of wiring, and the overall budget.


In 2019, the city of Charlotte, North Carolina discovered an unexpected inhabitant living in a junction box – a small, three-pound opossum! The opossum had somehow gotten into the junction box and was safe and sound until it was removed. Thankfully, the opossum was released back into the wild on the same day. This just goes to show that you never know what kind of critters might be hiding in a junction box! Source:

Disclaimer: This buying guide was not created by humans, and it is possible that some of it's content is inaccurate or incomplete. We do not guarantee or take any liability for the accuracy of this buying guide. Additionally, the images on this page were generated by AI and may not accurately represent the product that is being discussed. We have tried to convey useful information, but it is our subjective opinion and should not be taken as complete or factual.