Cable Caps | Heat Shrink Cable Caps For Sealing Cable Ends
Cable Caps
Cable Caps
Heat Shrinkable Moulded Parts – 3M SKE End Caps
3M heat shrink cable caps and cable breakouts are designed for quick and easy insulation and sealing of cable end or crutches, and provide resistance to abrasion, weathering and chemical attack. Each heat shrink cable cap is a moulded part which will cover a wide range of sizes and different types of cables up to 145mm outside diameter.
Cable caps are suitable for use with de-energised (“dead”) and out of service cables: LV 600V 1000V | MV 11kV 33kV | HV 66kV 132kV – refer to cable abandonment kits for temporary or permanent sealing and grounding of LV cables up to 3.3kV subject to potential future energisation.
These heat shrinkable moulded parts are made from semi-rigid, cross-linked modified polyolefin material which is internally coated with hot melt adhesive. The materials used are zero halogen.
On application of heat, using a heat shrink gas torch, the adhesive melts and the cable cap shrinks forming a perfect watertight seal.
Thorne & Derrick distribute complete range of cable terminations in both heat shrink and Cold Shrink for LV (Low Voltage), MV (Medium Voltage) and HV (High Voltage) cables and power systems.
Heat Shrink Cable Caps
Cable Caps
Dimensions
Cable caps are coated with an inner wall or hot melt sealant exhibiting excellent bonding and sealing characteristics to all materials commonly used in the cable insulation and sheath constructions including plastic, rubber, lead and aluminium.
| 3M Heat Shrink Cable Cap Part Number | Cable Cap Application Range |
Ø Exp. |
Ø Recov. |
Length Recov. |
Wall Thickness Recov. |
| sqmm | mm | mm | mm | mm | |
| 3M SKE 4/10 | 4 – 8 | 10 | 4 | 40 | 2.5 |
| 3M SKE 8/20 | 8 – 16 | 20 | 8 | 65 | 2.5 |
| 3M SKE 15/40 | 15 – 32 | 40 | 15 | 105 | 3.0 |
| 3M SKE 25/63 | 25 – 51 | 63 | 25 | 160 | 4.5 |
| 3M SKE 30/76 | 30 – 61 | 76 | 30 | 140 | 4.5 |
| 3M SKE 45/100 | 45 – 80 | 100 | 45 | 160 | 4.0 |
| 3M SKE 61/158 | 63 – 126 | 158 | 63 | 190 | 4.0 |
MATERIAL CHARACTERISTICS
| Physical Properties | Value | Test Method |
| Density | 1.05 ± 0.2 g/cm3 | ASTM D-1505/D=M/V |
| Hardness | 45 ± 3 shore D | ASTM D-2240 |
| Tensile strength | 10 N/sqmm | ASTM D-412 / ISO 37 |
| Ultimate elongation | 300 % | ASTM D-412 / ISO 37 |
| Water absorption | 0.15 % | ASTM D-570 / ISO 62 |
| Longitudinal Shrinkage | 10 % | – |
| Recovery Temperature | 120 °C | IEC – 216 |
| Peel strength | 100 N/25 mm | Rolling Drum method |
| Thermal Tests | ||
| Operating temperature range | – 30 °C, + 135 °C | DIN 53 466 |
| Thermal Ageing (150 °C for 168 hrs) | ||
| Tensile strength | 8 N/sqmm | ASTM D-412 / ISO 37 |
| Ultimate elongation | 200 % | ASTM D-412 / ISO 37 |
| Flammability | Not self extinguishing | ASTM D 876 |
| Low Temperature Flexibility | – 40 °C | ASTM D 2671C |
| Electrical Properties | ||
| Volume resistivity | 1 x 1013 Ohm-cm | ASTM D-257 / IEC 93 |
| Dielectric strength | 10 kV/mm | ASTM D-149 / IEC 243 |
| Chemical Properties | ||
| Corrosion | None | ASTM D 2671 |
Excerpt Cable Jointing Manual LV Cables (UKPN) | Sealing & Capping LV Cables | Gently apply a soft flame from a gas torch to heat the end of the cable cap first before moving on to shrink along the full length – the Jointer is pictured using an insulated plastic wedge to retain the cap in place on the cable end. Utility audits have evidenced from field reports that steel wire armoured, plastic sheathed power, pilot and telecoms cables showed signs of water ingress even though they had been sealed. The main cause was diagnosed as due to the outer sheath only being sealed. Several cable types have both an inner and outer plastic sheath that both require to be sealed from moisture as water can travel between theses sheaths along the armour wires.
➡ Refer to the section below to review the complete range of Cable Caps.
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