8420 Series insulators are open ended tubular rubber sleeves. Factory expanded and assembled on a removable core they are supplied for field installation. Once positioned for installation the core is removed allowing the tube to shrink and create a waterproof seal.

• Easily installed
• Suitable for various cable sizes
• Torches or heat not required
• Good thermal stability
• Tight seal
• Resilience and pressure remain consistent after years of ageing and exposure
• Excellent wet electrical properties
• Tough rubber formulation
• Waterproof
• Fungus resistant
• Acid and alkalis resistance
• Ozone and ultra violet light resistance

• Primary electrical insulation for all solid dielectric insulated wire (rubber and plastic) and cable splices with 1000 V rating
• Direct burial or submersed
• Indoor, outdoor or overhead use
• Provides physical and moisture sealing protection for high-voltage air insulated connectors and lugs. Examples - Spacer cable and lug connections to busbar
• Secondary splice copper or aluminium conductor insulation
• Service relocation
• Inline conductor transition connector insulation

• 307-774 is a 457 mm long cold shrink sleeve with a 67.8 mm sleeve diameter
• 307-825 is a 203.2 mm long cold shrink sleev ewith a 20.9 mm sleeve diameter
• 307-831 is a 279 mm long cold shrink sleeve with a 30.1 mm sleeve diameter
• 307-847 is a 203.2 mm long cold shrink sleeve with a 20.9 mm sleeve diameter
• 308-014 is a 303.5 mm long cold shrink sleeve with a 35.1 mm sleeve diameter
• 308-042 is a 152 mm long cold shrink sleeve with a 67.8 mm sleeve diameter
• 308-109 is a 228.6 mm long cold shrink sleeve with a 30.1 mm sleeve diameter

3M is a trusted name in connector and wiring solutions, providing high quality cables, connectors and accessories. From industrial computing to domestic applications, 3M provides the reliable and versatile product range you need.