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When purchasing waterproof junction boxes, IP protection rating is a very important factor. According to IEC regulations, the first digit of IP (Ingress Protection) rating represents the housing's ability to resist solid particle ingress, while the second digit indicates the housing's protection against water droplets.
IP rating is defined solely for the housing itself, but the equipment should also meet corresponding requirements after installation. That is to say, if a waterproof cable gland needs to be installed on the waterproof junction box, its protection level should be higher than the box body (mainstream waterproof cable glands on the market can reach IP68 standard).

2. Choose the correct size
Of course, choosing the correct size of waterproof box is primarily based on the size of existing components and the locations where the equipment will be placed. However, we should also consider whether new components will be added in the future and whether there will be enough space. Additionally, it should be noted whether 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 parts are included in the standard configuration
Most manufacturers (especially domestic manufacturers) do not indicate which standard accessories are included in their product codes. Generally, a junction box includes a cover, box body, sealing strip, and cover screws. Depending on different needs, manufacturers may also provide optional accessories such as wall mounting brackets, mounting plates, cable glands, etc. To avoid troubles later, it is very necessary to clarify which are standard parts and which are optional accessories before placing an order.

4. Long-term working environment of the equipment
Generally speaking, buy what is right, not what is expensive. Waterproof junction boxes have significant price differences based on different materials. Before selecting, you should first clarify whether the equipment will work indoors or outdoors for a long time. If it is the former, we recommend ABS waterproof junction boxes with relatively lower prices. ABS can fully meet general indoor needs with its excellent comprehensive performance. If it is an outdoor environment, it is better to use polycarbonate waterproof junction boxes, which have better weather resistance, heat resistance, flame retardancy, UV resistance, anti-aging properties than ABS products, but of course the price is also higher.