Differences Between Waterproof Cables and Ordinary Cables, and Types of Waterproof Cables

The main difference between waterproof cables and ordinary cables lies in their operating environment and functional characteristics. Waterproof cables can be used normally in water or humid environments, possessing complete water-blocking capabilities that prevent moisture from entering the cable interior, thus avoiding damage to the cable and ensuring long-term stable operation in underwater or humid environments.

Ordinary cables, on the other hand, cannot be used in water; their design and materials do not account for waterproofing, and exposure to water or humid environments may lead to decreased performance or even damage.

Oil-impregnated paper insulated cables: These are the most typical water-resistant cables. Their insulation and conductors are filled with cable oil, and the insulation is covered with a metal sheath (lead or aluminum sheath), giving them excellent water resistance. However, oil-impregnated paper insulated cables are limited by elevation differences, prone to oil leakage, and difficult to maintain, so their use is becoming less common.

Ethylene propylene rubber insulated cables: These cables are widely used in medium and low-voltage underwater transmission lines and have superior insulation performance without the risk of "water treeing." Waterproof rubber-sheathed cables (JHS type) can operate safely in shallow water for extended periods, making them widely used in underwater transmission lines.