When installing cables for the waterproof ready board box (small power distribution board), the following must be paid attention to. For plugs and sockets with different current ratings, cable glands can only be used for cables of a specific diameter range. If the cable diameter is too small, the gap will not be blocked and dust will not be generated. Especially in the outdoor, rainwater will penetrate into the cable, affecting the insulation, easy to leak or short circuit. Therefore, it is worth noting whether the cable selected by the user is suitable for the waterproof ready board box (small power distribution board). Secondly, if the cable is too long, it will often lead to long peeling time of the cable sheath and the chip will be squeezed. This can easily damage the cable or harden the clips. If the cable is unplugged, the power supply will be turned off, and if it is serious, it will be short circuited.