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What is a waterproof cable?

Promulgator : DIHAO Date : 2020-03-13

Waterproof cables mainly refer to preventing water from entering the inside of the cable structure, and adopting structures and materials with waterproof function on the protective layer of the cable. JHS is a kind of waterproof cable also belongs to a kind of rubber sheathed flexible cable. The insulation is rubber insulation. Like ordinary rubber sheathed cable, JHS waterproof cable is often used on the move, but it is in water or some will pass through the water. Where waterproof cables are generally 3 cores, most of them are used when connecting water pumps. The price of waterproof cables is also more expensive than ordinary rubber-sheathed cables. It is difficult to distinguish whether they are waterproof or not. The consultant can know the waterproof layer.

Waterproof cable structure type

1. For single-core cable, the semi-conductive resistance water tape is wrapped on the insulation shielding layer, and the ordinary water resistance tape is wrapped on the outside. Wrap the single-conductor resistance water hose. The water shield is no longer wound outside the metal shield. Depending on the level of waterproof performance, the filling can be ordinary filling or water blocking filling. .

2. The aluminum-plastic composite tape layer is longitudinally wrapped inside the outer sheath or the inner lining layer as a waterproof layer.

3. Squeeze the HDPE outer sheath directly on the outside of the cable.

XLPE insulated cables above 110kV class use metal sheath to meet waterproof requirements. The metal sheath has complete impermeability and good radial water resistance. The main types of metal cover are: hot-pressed aluminum sleeve, hot-pressed lead sleeve, welded wrinkled aluminum sleeve, welded wrinkled steel sleeve, cold-drawn metal sleeve, etc.

Waterproof cable waterproof form

Generally divided into two types of longitudinal water blocking and radial diameter water. Water-blocking yarn, water-blocking powder, and water-blocking tape are commonly used in longitudinal water blocking. The water-blocking mechanism is that these materials contain a material that expands when exposed to water. After entering, this material will rapidly expand in the presence of water to prevent water from further spreading along the longitudinal direction of the cable, achieving the purpose of longitudinal waterproofing of the cable. Radial water blocking is mainly achieved by extruding HDPE non-metallic sheathing or hot pressing, welding, and cold-drawn metal sheathing.