Junction boxes and joint boxes have similar names which may confuse some individuals while they carry out electrical installation. A junction box is an enclosure that protects and contains wiring connections or electrical equipment, while a joint box is a connection point for two or more wires, which are then connected using a connector block. This article will elaborate on the difference between a junction box and a joint box.
Function
Junction and joint boxes have different functions in terms of electrical connections. A junction box protects electrical wires or equipment, while a joint box connects electrical wires together. A junction box is an enclosure that is used to house several wires, which are then connected to the main cable. On the other hand, a joint box is used to extend electrical circuits by combining two or more wires together.
Design and Size
Moreover, junction boxes and joint boxes differ in their designs and sizes. Junction boxes are typically designed with a removable cover that allows easy access to wires and electrical components inside. They are available in various sizes and shapes to fit different installation needs. Joint boxes, on the other hand, are designed to connect wires and are usually small. They are available in different sizes to accommodate the number of wires that need to be connected.
Location
Junction boxes and joint boxes have different locations. Junction boxes are typically located where wires meet, either in ceilings or walls. They are used where the wires will be concealed, so they need to be installed in the correct location. Joint boxes, on the other hand, are commonly located at the end of a wire or where two wires overlap and are connected together.
Protection
Junction boxes are designed to protect electrical connections from damage, water, dust, and other external factors that may cause harm to the electrical equipment. They come in various levels of protection to meet different requirements. Joint boxes do not have the same level of protection as junction boxes; they are merely designed to connect electrical wires.
Use
Another difference between junction boxes and joint boxes is their use. Junction boxes are used for a wide range of electrical applications, including lighting, appliances and outlets, while joint boxes are specifically designed to connect wires and are limited to that use. Moreover, junction boxes can be used in both indoor and outdoor installations because of the level of protection they have, whereas joint boxes are not recommended for outdoor use due to their limited protection level.
Cost
Junction boxes tend to be more expensive than joint boxes due to the fact that they provide protection and the required level of safety required. Joint boxes are simply connection points and, therefore, are less expensive compared to junction boxes.
Materials
The materials used to make junction boxes and joint boxes are also different. Junction boxes are made of a variety of materials such as plastic, metal, and steel to provide varying levels of protection. Joint boxes are most commonly made of plastic or polymers as they do not require the same level of protection as junction boxes.
Capacity
The capacity of junction boxes and joint boxes is another difference. Junction boxes can accommodate larger wires and electrical components because they are designed to contain multiple wires. In contrast, joint boxes are used to connect small wires, and they have a limited capacity.
Code Requirements
Finally, there are code requirements that dictate the use and installation of junction and joint boxes. Electrical codes require that junction boxes be installed in specific locations and in certain ways to ensure safety. Joint boxes, on the other hand, are not always required to meet code, but it is vital to ensure that they are installed safely and effectively.
Conclusion
In summary, junction boxes and joint boxes are different in their function, design, size, location, protection, use, cost, materials, capacity, and code requirements. When deciding between a junction box and a joint box, the application and use of the electrical connection should be considered to ensure the correct choice is made.