3M 8429-12 Cold Shrink Connector Insulators
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Manufacturer 3M
Mfg Catalog # 8429-12
Crawford Part # 264


  • Specially designed for primary insulation of solid dielectric insulated wires and cable splicing rated to 1000 volts
  • Simple installation which requires no tools
  • Sealing of terminal lug barrels, conduit couplings and conduit-to-cable breakouts
  • Made of black EPDM rubber
  • Made of EPDM rubber which contains no chlorides or sulfur
  • Withstands temperatures of -40 to 194 degrees F (-40 to 90 degrees C)
  • Environmental sealing for communication and other non-electrical applications


  • Application: Insulation, mechanical protection, repair
  • Cable Shielding: Wire Shield - Tape Shield - UniShield®
  • Color Family: Black
  • Conductor Material: Copper - Aluminum
  • Conductor Size Range: 900-1000 kcmil
  • Conductor Size Range (Metric): 500 mm²
  • Conductor Sizes: 900 kcmil - 1000 kcmil
  • Halogen Free: No
  • Inner Diameter After Shrink (Imperial): 0.839 in
  • Inner Diameter After Shrink (Metric): 21.3 mm
  • Inner Diameter Before Shrink (Imperial): 2.85 in
  • Inner Diameter Before Shrink (Metric): 72.4 mm
  • Material: EPDM Rubber
  • Maximum Connector Length: 8.0 in
  • Maximum Connector Length (Metric): 203.2 mm
  • Maximum Operating Temperature (Celsius): 90 Degree Celsius
  • Maximum Operating Temperature (Fahrenheit): 194 Degree Fahrenheit
  • Maximum Wire Gauge: 67.8mm²
  • Minimum Operating Temperature (Celsius): -40 Degree Celsius
  • Minimum Operating Temperature (Fahrenheit): -40 Degree Fahrenheit
  • Minimum Wire Gauge: 32.2mm²
  • Model: Cold-shrink
  • Number of Conductors: 1
  • Operating Temperature (Celsius): -40 up to +90°C
  • Overall Diameter (Metric): 67.8 mm
  • Overall Length (Imperial): 0 NP
  • Overall Length (Metric): 304.8 mm
  • Product Color: Black
  • Product Type: Cold shrinking
  • Relaxed Tube Length: 12 in
  • Relaxed Tube Length (Metric): 304.8 mm
  • RoHS EU Comments: RoHS 2011/65/EU compliant without exemption
  • Shrink Ratio: 2:1
  • Splice Type: Cold Shrink
  • UL Approval: No
  • Voltage: 1 kV
  • Voltage Application: Low Voltage
  • Wall Thickness after Shrinking: 4.6 mm
  • With Inner Glue: No


UPC 05400742389
Product Description 3M Cold Shrink Connector Insulators 8420 and 8430 Series are designed using 3Ms proprietary cold shrink delivery system. Products are supplied prestretched on a removable core for efficiency and ease of installation. Removal of the core (unwinding) after positioning the splice allows the product to shrink into position forming a moisture-tight seal. The live memory action of the specially formulated EPDM material promotes a permanent, durable environmental seal and insulation, with a typical operating temperature range from -40194F (-4090C). The 8420 insulator meets requirements of ANSI C119-1 and Western Underground Guide 2.14 for secondary splices rated up to 1 kV. Applications: Primary electrical insulation for all solid dielectric (rubber and plastic) insulated wire and cable splicing rated to 1000 V. Good for repairs and environmental sealing for communication and other non-electrical applications. Important: Use insulation jacket or connector O.D. for final ordering criteria. * Mastic pads included for cable O.D. build-up. ** Kit contains adapters. *** These sizes are listed for availability only and are not designed to be used as primary insulation. These tubes are for conduit sealing and breakouts. ****Maximum connector length: 5.625 Point of Purchase packaging designated by P. Example: 8423-6P
MDM Pkg GTiN 00054007423898
Size 1000 kcmil; 900 kcmil
Type Cold Shrink Splice
Material EPDM-rubber
Number of Conductors 1
Cable Type Power Cable
Family Brand Name 3M
Length 305 mm
Color Black
Voltage 1 kV
Splice Type Cold Shrink
Product Type Cold Shrinking
Conductor Size 900 MCM
Diameter 67.8 mm
Max Operating Temperature 194 degrees F
Overall Length 304.8 mm
Applications Insulation, Mechanical Protection, Repair

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