Three method we can do.
Firstly, the number of A and A terminals required inside can be determined based on power/voltage=current. Secondly, it is necessary to open several holes to handle the incoming and outgoing lines, with several inputs and outputs required. You should know how many sets of wires to enter and how many sets of wires to exit. For example, if a junction box with one input and four outputs is required, and the wires are 3 * 2.5 square meters, then as standard, a waterproof rubber core of 8-12mm is required. The wiring range of the waterproof junction box is 0.5-4.0 square meters: the larger the square meter, the larger the wiring. The waterproof rubber core is 3-6mm 4-8mm 6-11mm 8-12mm 10-14mm. The most important thing is the diameter of the incoming and outgoing wires, because waterproof joints need to be configured according to the wire diameter. Thirdly, others should be judged based on their own usage environment, such as the usage scenario, waterproof level, box size, and box material, which need to be chosen by oneself.
1. Choose Correct selection of sealing level
Choosing a waterproof junction box, IP protection level is a very important factor. According to IEC regulations, the * * digits of IP (Ingress protection) level represent the ability of the shell to resist the invasion of solid particles, while the * * digits represent the shell's ability to protect against water droplets. The IP rating of the Greenway waterproof junction box has all reached IP68, which means it can adapt to more demanding usage environments.
The IP level is only defined for the shell, but the equipment should also meet the corresponding requirements after installation. That is to say, if the waterproof junction box needs to be equipped with waterproof cable connectors, its protection level should be higher than the box (mainstream waterproof cable connectors on the market can meet the IP68 standard).
2. Choose the correct size
Of course, choosing the correct size of the waterproof box is first determined based on the size of existing components and the location of the equipment to be placed. However, we should also consider whether new components will be added in the future, and if so, whether the space is sufficient. Also, it should be noted that the reference dimensions provided by the junction box supplier are external dimensions or internal dimensions. The installable space is usually smaller than the provided internal dimensions, which should also be noted.
3. Pay attention to which components are included in the standard configuration of the product
Most manufacturers (especially domestic manufacturers) do not include standard accessories in their product numbers. Usually, we can understand that a junction box includes a box cover, box body, sealing strip, and box cover screws. According to different needs, manufacturers will also provide optional accessories such as wall fixing hanging corners, installing floors, and cable connectors. It is necessary to clarify which standard components and optional accessories are available before placing an order in order to avoid any inconvenience afterwards.
4. Long term working environment of equipment
Usually, only buy the right things, not the expensive ones. The price of waterproof junction boxes varies greatly depending on the materials used. Before model selection, you should first make clear whether the equipment will work indoors or outdoors for a long time. Product materials: waterproof junction boxes are mainly used in relatively harsh environments. When purchasing, you should consider ABS waterproof junction boxes with relatively low prices, such as impact resistance, load strength, insulation, non-toxic and anti-aging properties. ABS can fully meet the general indoor needs with its excellent comprehensive performance; If it is a good outdoor environment, the waterproof junction box made of nylon PA66 material has better weather resistance, heat resistance, flame retardancy, UV resistance, aging resistance, and other properties than ABS material products. Of course, the price is also higher.