Cable Breakouts | Heat Shrink Breakouts For 3 & 4 Core Cables
Cable Breakouts
Heat Shrinkable Moulded Parts – 3M SKE Cable Breakouts
Cable breakouts are used to protect terminated cable ends and multi-core cable crutches against moisture and contaminants in indoor enclosed electrical equipment (switchgear/transformer/cable box) or outdoor (pole mounted) cable termination applications on low voltage power networks, 600/1000V.
The below selection tables enable the specification of the correct cable breakouts manufactured by 3M Electrical using heat shrink technology to provide cable sealing, electrical insulation and mechanical protection to the cable crotch/crutch area on 3 and 4 core low voltage power cables and cable terminations, 600V1000V – the cable breakouts are installed using gas torches.
To provide electrical insulation and sealing to exposed cable ends against environmental conditions, including water ingress, see our range of cable caps manufactured in Cold Shrink technology.
Cable Breakouts for Power Cables up to 1000V 1kV Features
- High electrical characteristics and mechanical strength for low voltage cable protection, termination and applications
- Breakouts manufactured from medium wall, cross-linked polyolefin, UV stabilised against irradiation and weathering
- Halogen and silicon-free material content, noncorrosive, non-toxic, free of lead and aluminium – colour black
- Breakouts are inline coated with hot melt adhesive inside the cable breakout body and fingers
Cable Breakouts are available for 2 Core, 3 Core, 4 Core, 5 Core & 6 Core cables – conductive heatshrink breakouts are also available.
Excerpt from 33kV Jointing Manual | pass the heatshrink cable breakout over the lead sealing sleeves and pull down into the cable crutch. Shrink the breakout down starting in the centre before moving towards the over-sheath of the cable and then shrink the breakout fingers. (UKPN ECS 02-0033).
Heat Shrink Cable Breakouts
3 Core Cables
➡ 3 Core Breakouts Power Cables Up To 1kV
3M Heat Shrink Cable Breakout Part Number | Breakout Range on LV Cable |
Ø Neck Exp. |
Ø Neck Recov. |
Ø Finger Exp. |
Ø Finger Recov. |
Length Recov. |
Wall Thickness Neck Recov. |
Wall Thickness Finger Recov. |
sqmm | mm | mm | mm | mm | mm | mm | mm | |
SKE 3F/1-1.5 | 6 – 16 | 25 | 09 | 09 | 03 | 70 | 2.5 | 1.8 |
SKE 3F/2 | 10 – 50 | 35 | 15 | 13 | 04 | 100 | 2.5 | 1.8 |
SKE 3F/4 | 50 – 150 | 55 | 23 | 30 | 08 | 170 | 3.5 | 2.7 |
SKE 3F/5 | 185 – 400 | 110 | 35 | 50 | 17 | 215 | 3.5 | 3.5 |
SKE 3F/6 | – | 110 | 35 | 50 | 17 | 215 | 3.5 | 3.5 |
SKE 3F/7 | – | 150 | 56 | 64 | 28 | 260 | 3.5 | 3.5 |
Heat Shrink Cable Breakouts
4 Core Cables
➡ 4 Core Breakouts Power Cables Up To 1kV
3M Heat Shrink Cable Breakout Part Number | Breakout Range on LV Cable |
Ø Neck Exp. |
Ø Neck Recov. |
Ø Finger Exp. |
Ø Finger Recov. |
Length Recov. |
Wall Thickness Neck Recov. |
Wall Thickness Finger Recov. |
sqmm | mm | mm | mm | mm | mm | mm | mm | |
SKE 4F/0 | – | 28 | 09 | 08 | 02 | 80 | 2.0 | 1.5 |
SKE 4F/1+2 | 4 – 35 | 35 | 15 | 15 | 04 | 100 | 3.8 | 1.8 |
SKE 4F/3+4 | 25 – 150 | 57 | 23 | 30 | 06 | 170 | 4.0 | 3.0 |
SKE 4F/5 | 120 – 400 | 95 | 36 | 38 | 14 | 220 | 3.5 | 2.5 |
SKE 4F/6 | – | 117 | 36 | 46 | 14 | 220 | 3.5 | 2.5 |
Material Characteristics
The following figures are average values, established to the best knowledge of 3M Electrical, but not to be used for specification purpose.
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/mm² | 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/mm² | 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 | 10kV/mm | ASTM D-149 / IEC 243 |
➡ Refer to the section below to review the complete range of Cable Breakouts.