How to waterproof the tail end of the electric heating cable?

Currently, there are two main methods for insulating the end of electric heating cables: one for industrial use, using a cable end junction box, and the other for residential use, using heat shrink tubing for sealing. Regardless of which method is used, the end must be waterproofed. The two methods are explained below:

The typical specifications for the cable end junction box are: rated voltage 220V/380V, IP rating: IP54, rated current: 15A, 25A, cable thread: G3/4, explosion-proof mark: Exem11T4. Specific installation instructions: Strip the outer jacket and shield from the end of the heating cable, cut the cable cores at an angle, and insert the treated end into the end terminal (do not butt the two cores together at the end, and face the connection downward to prevent rainwater infiltration). In humid environments or when buried underground, the junction box can be waterproofed by filling it with silicone. Furthermore, the end junction box should be enclosed in the heating insulation layer. The insulation layer should be kept dry. For outdoor use, a waterproof cover is required.

When using heat shrink tubing to seal the heating cable, cut the end of the cable at an obtuse angle with scissors to prevent the cable's integrated shrink copper wire from protruding and breaking the tape. Silicone shrink tubing can be inserted into the cable and tightened with a lighter (a 6cm tube can be inserted into a 4cm tube, then the remaining 2cm can be folded back and heated). Then, a 4cm tube of silicone shrink tubing can be used to shrink and seal the cable for protection. Finally, wrap the cable end securely with high-pressure waterproof tape. If using electrical tape alone, remember: absorbent electrical tape is not permitted.