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3M™ Cold Shrink Connector
Insulators 8420 Series
Product
Description
3M™ Cold Shrink Connector Insulato rs 8420 are open-ended, tubular, ru bber sleeves which are
factory expanded and assembled onto a remova ble core. The core is removed after the tube has
been positioned for installation over an inline connection, terminal l ug, etc., allowing the tube to
shrink and form a water-resistant seal. The insulating tube is made of EPDM rub ber which contains
no chlorides or sulfur. Six diameter sizes will cover a range of cable up to 1000 volts for copper and
aluminum conductors from 10 AWG through 1000 kcmil.
To extend the useful life of this product in applications which are continuously exposed to high levels
of ultra-violet radiation, overwrap with Scotch® Super 33+™ Vinyl Tape or Scotch® Self-Flushing
silicone Rubber Tape 70.
Features Simple installation, requires no tool s.
Accommodates a wide range of cable sizes.
No torches or heat required. Good ther mal stability.
Seals tight, retains its resiliency and pressure even after prolonged years of aging and exposure.
Excellent wet electrical properties.
Improved, tougher rubber formulation to withsta nd backfilling.
Water-resistant. Meets the water seal re quirements of ANSI C119.1.
No mastic or tape required to seal.
Resists acids and alkalis, resists o zon e.
Data Sheet November 2013
Applications
Primary electrical insulation for all solid dielectric (rubber and plastic)
insulated wire and cable splicing rated to 1000 volts.
Direct burial or submersi ble. For indoor, outdoor.
Physical protection and moisture sealing for air-insulated connect ors and lugs such as spacer
cable and lug conn ections to bus bar.
Insulation of secondary splices, copper or aluminum conductors.
Relocation of service. Dig-in repairs.
Sheath repairs.
Environmental sealing for communication and other non-electrical applications.
Insulation of inline conductor transition conne ctors (se e Figure 1).
3M™ Cold Shrink Connector Insulator 8426
2/0 4/0
15/16” Connector Figure 1
3M™ Cold Shrink Connector Insulators 8420 Series
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Typical
Physical
and
Electrical
Properties
Not for specifications. Values are typical, not to be considered mini mum or maximum.
Properties measured at room temperature 73°F (23° C) unless otherwise stated.
EPDM Rubber
Physical Properties (Test Method) Typical Value
US units (metric)
Colo
r
Black
300% Modulus
(ASTM D 412–75) 480 psi
(3,3 MPa)
Ultimate Tensile
(ASTM D 412–75) Original 1400 psi
(9,6 MPa)
Ultimate Elongation
(ASTM D 412–75) Original 750%
Die C Tear
(ASTM D 624C–73) Original 150 pli
(26,3 KN/m)
Moisture Absorption
7 days 90 °C (194 °F) H2O wt. gain
1.8%
Electrical Properties (Test Method) Typical Value
US units (metric)
Dielectric Strength
(ASTM D 149–75) Original
@ 1,78 mm
365 v/mil
(14,3 Mv/m)
7 days in H2O at
90 °C (194 °F) 282 v/mil
(11,1 Mv/m)
3M™ Cold Shrink Selection Table
Product Number
Conductor Sizes
AWG & Kcmil
Product Diameter Range (Minimum –
Maximum)* Inches (mm)
Relaxed Tube Length Inches
(mm)
8423–6 6 – 4 0.31 – 0.56 (7,80 – 14,3) 6.0 (152)
8424–8 10 – 1/0** 0.10 – 0.82 (2,54 – 20,9) 8.0 (203)
8425–8 2 – 1/0 0.40 – 0.82 (10,1 – 20,9) 8.0 (203)
8426–9
8426–11 2/0 – 250
2/0 – 250 0.55 – 1.18 (13,9 – 30,1)
0.55 – 1.18 (13,9 – 30,1) 9.0 (229)
11.0 (279)
8427–6***
8427–12
8427–16
—
250 – 400
250 – 400
0.67 – 1.38 (16,8 – 35,1)
0.67 – 1.38 (16,8 – 35,1)
0.67 – 1.38 (16,8 – 35,1)
6.0 (152)
12.0 (305)
16.0 (406)
8428–6***
8428–12
8428–18
—
450 – 800
450 – 800
0.95 – 1.94 (24,0 – 49,3)
0.95 – 1.94 (24,0 – 49,3)
0.95 – 1.94 (24,0 – 49,3)
6.0 (152)
12.0 (305)
18.0 (457)
8429–6***
8429–9****
8429–12
8429–18
—
900 – 1000
900 – 1000
900 – 1000
1.27 – 2.67 (32,2 – 67,8)
1.27 – 2.67 (32,2 – 67,8)
1.27 – 2.67 (32,2 – 67,8)
1.27 – 2.67 (32,2 – 67,8)
6.0 (152)
9.0 (229)
12.0 (305)
18.0 (457)
8430–9***
8430–18 —
1250 – 2000 1.68 – 3.69 (42,6 – 93,7)
1.68 – 3.69 (42,6 – 93,7) 9.0 (229)
18.0 (457)
NOTES:
* Minimum = Seal Diameter Maximum = Connector Clearance Dimension
** Product contains range-extending adapters (Without adapters, 8424–8/8425–8 ranges are identical).
*** Primary uses: Sealing of terminal lug barrels, conduit couplings and conduit–to–cable breakouts.
**** Maximum connector length: 5.625" (For longer connector bodies, select 8429–12/8429–18 as needed).
IMPORTANT: Use wire insulation/jacket diameters and connector O.D. for final sizing confirmation.
3M™ Cold Shrink Connector Insulators 8420 Series
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EHS
3M Cold Shrink Removable Core is a m ixed polymer and recyclable with other waste.
Read all Health Hazard, Precautionary and First Aid statements found in the Material Safety Data
Sheet (MSDS) and/or product label prior to handling or use.
3M, Super 33+ and Scotch are trademarks of 3M Company.
3
Electrical Markets Division
6801 River Place Blvd.
Austin, TX 78726-9000
800.245.3573
FAX: 800.245.0329
www.3M.com/electrical
Please recycle
© 3M 2013 All rights reserved
78-8141-5459- 3 Rev B
Shelf Life &
Storage
3M Cold Shrink Connector Insulators 84 20 Series have a 5-year shelf life from date of manufacture
when stored in a humidity controlled storage (10°C/50°F to 27°C/80°F and <75% relative humidity).
Availability Please contact your local distributor; available from 3M.com/electrical [Where to Buy] or call
1.800.245.3573.
Important Notice
All statements, technical information, and recommendations related to 3M’s products are based on information
believed to be reliable, but the accuracy or completeness is not guaranteed. Before using this product, you must
evaluate it and determine if it is suitable for your intended application. You assume all risks and liability associated
with such use. Any statements related to the product, which are not contained in 3M’s current publications, or any
contrary statements contained on your purchase order, shall have no force or effect unless expressly agreed upon,
in writing, by an authorized officer of 3M.
Warranty; Limited
Remedy; Limited
Liability
This product will be free from defects in material and manufacture at the time of purchase. 3M MAKES NO OTHER
WARRANTIES INCLUDING, BUT NOT LIMITED TO, ANY IMPLIED WARRANTY OF MERCHANTABILITY OR
FITNESS FOR A PARTICULAR PURPOSE. If this product is defective within the warranty period stated above,
your exclusive remedy shall be, at 3M’s option, to replace or repair the 3M product or refund the purchase price of
the 3M product. Except where prohibited by law, 3M will not be liable for any indirect, special, incidental or
consequential loss or damage arising from this 3M product, regardless of the legal theory asserted.
Working around energized systems may cause serious injury or
death. Installation should be performed by personnel familiar with
good safety practice in handling electrical equipment. De-energize
and
g
round all electrical s
y
stems before installin
g
p
roduct.
