To choose heat shrink cable accessories, measure the largest diameter you need to fit over and the smallest diameter to seal onto.

Pick a tube with a wider expanded diameter and a smaller recovered diameter than the first one, ensuring a tight, waterproof seal.

Choosing the right heat shrink cable accessory is crucial and mainly depends on the cable's voltage rating.

For low voltage, thin-wall tubes work well for basic insulation and sealing.

And for medium to high voltage, you need thicker, multi-layer accessories with specialized stress control layers to manage the electrical field and prevent insulation failure.

The heat shrink accessory should match or exceed this rating for safety.

When choosing heat shrink cable accessories, the conductor material is a key factor to consider. Copper conductors are easy to work with. On the one hand, standard heat shrink tubes offer great insulation and protect against oxidation after a secure connection is made.

On the other hand, aluminum conductors, favored for their light weight, come with notable challenges. They quickly form a protective oxide layer but are very prone to galvanic corrosion when touching different metals. For aluminum, the selection process is more critical.

The tube must create a perfect, hermetic seal to contain the gel and permanently lock it requires a meticulous approach: Apply an antioxidant compound to the connection before crimping to prevent oxidation, then use a high-quality heat shrink tube to keep moisture out and ensure long-term protection and performance.

Electrical cables are crucial for modern infrastructure but their connections are weak spots. Heat shrink accessories protect against moisture, corrosion, and electrical issues.

Choosing the right heat shrink accessories mainly depends on the cable's insulation material, which keeps the electrical current within the conductor. The key is to make sure the accessory's shrink temperature is lower than the cable insulation's melting or deformation point.Common cable insulation materials include PVC，XLPE /EPR and Silicone rubber.

Heat shrink tubes come in materials like polyolefin, neoprene, or fluoropolymers, each with its own shrink temperature. Make sure the adhesive’s activation temperature is safe for your cable insulation.

Please make sure the conductor's cross-section, whether in mm² or AWG, matches the connector size recommended by the manufacturer for a good electrical connection and fit.

Additionally, the cold shrink tube must fit snugly over both the cable’s outer jacket and the insulation layer to form a reliable seal and maintain stress control.

Checking the manufacturer’s sizing guide and measure the conductor and cable diameters accurately to ensure a safe, secure, and durable installation.

The cold-shrink cable are made from pre-expanded materials on a removable core, these accessories quickly shrink to create a tight, seamless seal when the core is removed. This makes installation faster, easier, and safer compared to heat-shrink options.
The key factor of choosing a right cold-shrink cable is managing electrical stress based on system voltage:
Low Voltage (LV, e.g., 0.6/1 kV) has minimal stress, so accessories focus on environmental sealing, mechanical strength, and strain relief.
Medium Voltage (MV, e.g., 6–35 kV) needs a built-in “stress cone” of conductive/semi-conductive rubber to evenly distribute electrical fields and prevent insulation damage.
High Voltage (HV, e.g., ≥66 kV) demands critical stress control with extended creepage distance, advanced grading materials, and strict installation tolerances.
Always pick a product rated at or above your system voltage, like 8.7/15 kV. Using one with a lower rating can cause it to fail.