Fully insulated cable waterproof joint

Installation process matters needing attention

For cross-linked cables without a sheath, once the water enters the outer sheath of the cable, it will easily invade the copper shield. It reaches the outer semi-conductive layer of the cable core, then extends longitudinally to threaten the safe operation of the cable joint. Okay. It is necessary for the waterproof accessories to block the entry of water all levels on the lines close to the cable joint. This requires that the construction process of the waterproof joint of the device be improved without damaging the overall structure electrical functions of the cable.

3.1 Device technology of waterproof joint

1) The waterproof material is coated on the outer semiconducting layer of the core of the cross-linked cable the copper shielding layer.

The layer of waterproof material is tightly adhered. For this reason, in rehabilitation copper shielding, it is necessary to leave a certain gap around the package. To reveal the waterproof adhesive layer inside, use two waterproof adhesive layers a copper shield sandwiched between them to construct a "waterproof dike", as shown in Figure 2.

Figure 2 Device waterproof material

2) After embedding the waterproof lining strips covering the waterproof material of the cross-linked cables respectively, the waterproof lining strips in the middle are tight after the three-phase cables are tightly closed. Net shown.

3) Cross-linked cable surrounding the waterproof outer lining after merging

The 3M waterproof outer liner is surrounded by the grooves, the outer sheath is restored with waterproof tape with excellent relaxation waterproof function, it is closely bonded with the installed waterproof material. band

Things to note

1) On the cutting of copper tape shielding tape. First of all, check the surrounding direction of the copper shielding tape. Wrap the self-adhesive tape with 2 turns of PVC around the three-phase copper shield with a 0.3 m interception the outer sheath in the reverse direction (Be careful to hurt the outer semiconductive layer), loosen it to the other end (the exposed outer semiconductive layer should be no less than 0.3 m). If the wrong direction is selected, the copper shielding tape will be difficult to loosen.

2) The waterproof linings sheets made of high-pressure waterproof glue have strong self-adhesiveness will be tightly adhered once they touch. For this reason, the cable core should be stretched as far as possible during construction. When installing the sheet, peel off the inner protective paper first, then temporarily do peel off the outer protective paper after the device is installed to prevent mutual adhesion.