Heat-Shrink Tubing: Shrink Ratio and Voltage Rating for Power Cables

Heat-shrink for power cable is sized by voltage class (1, 10, 35 kV) and by shrink ratio (2:1 or 3:1). The voltage class sets the recovered wall; the ratio sets how far the sleeve closes.

For a joint, size the sleeve to the cable diameter after the joint is built, then confirm the recovered ID grips it. For terminations, match the kit to the cable cross-section list.

If the joint sees moisture, use a double-wall adhesive-lined tube so the inner layer seals on shrink.