8420 3M | Alldatasheet

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Connector Insulators 8420 Series Data Sheet Electrical Markets Division 3M United Kingdom PLC 3M Irel and Ltd 3M United Kingdom PLC Sales Office Sales Office Head Office PO Box 393 The Iveagh Building, The Park, 3M Centre, Cain Road Bedford MK41 0YE Carrickmines, Dublin 18, Ireland Bracknell, Berkshire RG12 8HT Telephone: 0870 609 4639 Telephone: (01) 800 812 732 Telephone: 01344 858 000 Fax: 01234 229 433 Fax: 353 1 280 3509 Fax: 01344 858 758 Product Description 3M Brand PST Cold Shrink Connector Insulators are a series of open-ended, tubular rubber sleeves, which are factory expanded and assembled onto a removable core. They are supplied for field installation in this pre-stretched condition. The core is removed after the tube has been positioned for installation over an inline connection, terminal lug, etc., allowing the tube to shrink and form a waterproof seal. The insulating tube is made of EPDM rubber, which contains no chlorides or sulphurs. Six diameter sizes will cover a range of 1000 volt cables, copper and aluminium conductors. PST features are:

  • Simple installation, requires only workman’s hands
  • Accommodates a wide range of cable sizes
  • No torches or heat required
  • Good thermal stability
  • Seals tight, retains its resiliency and pressure even after prolonged years of ageing and exposure
  • Excellent wet electrical properties
  • Improved tough rubber formulation to withstand rough backfilling
  • Waterproof. Meets water seal requirements of NEMA Pub. No. PP-C1
  • Resists fungus
  • Resists acids and alkalis
  • Resists ozone and ultraviolet light

Applications

  • Primary electrical insulation for all solid dielectric (rubber and plastic) insulated wire and cable splices rated to 1000 volts
  • Suitable for direct burial or submersion
  • For indoor, outdoor, or overhead use
  • Physical protection and moisture sealing for high-voltage, air-insulated connectors and lugs such as spacer cable and lug connections to bus bar
  • Insulation of secondary splices copper or aluminium conductors
  • Relocation of service
  • Dig-in repairs
  • Sheath repairs
  • Insulation of inline conductor transition connectors (see Figure 1) Figure 1

8426 PST Cold Shrink

Connector Insulator Connector 120mm2 70mm2

Connector Insulators 8420 Series Data Sheet Electrical Markets Division 3M United Kingdom PLC 3M Irel and Ltd 3M United Kingdom PLC Sales Office Sales Office Head Office PO Box 393 The Iveagh Building, The Park, 3M Centre, Cain Road Bedford MK41 0YE Carrickmines, Dublin 18, Ireland Bracknell, Berkshire RG12 8HT Telephone: 0870 609 4639 Telephone: (01) 800 812 732 Telephone: 01344 858 000 Fax: 01234 229 433 Fax: 353 1 280 3509 Fax: 01344 858 758 PST Selection Table Min. diameter (mm) Max. diameter (mm) Length (mm) 8423-6 7.8 14.3 152 8425-8 10.2 20.8 203 8426-9 13.0 25.4 229 8426-11 13.0 25.4 279 8427-6 17.5 33.0 152 8427-12 17.5 33.0 305 8427-16 17.5 33.0 406 8428-6 24.0 49.3 152 8428-12 24.0 49.3 305 8428-18 24.0 49.3 457 8428-24 24.0 49.3 609 8429-4 32.2 67.8 100 8429-6 32.2 67.8 152 8429-9 32.2 67.8 229 8429-12 32.2 67.8 305 8429-18 32.2 67.8 457 8429-24 32.2 67.8 610 8430-9 42.6 93.7 229 8430-18 42.6 93.7 457 8430-24 42.6 93.7 610 Data: Physical & Electrical Properties Typical Physical & Electrical Properties Physical Properties Test Method Typical Value Colour Black 100% Modulus ASTM D 412 1.17 Mpa 300% Modulus ASTM D 412-75 4.7 Mpa Ultimate Tensile ASTM D 412-75 Original 11.6 Mpa Ultimate Elongation ASTM D 412-75 Original 635% Die C Tear ASTM D 624C-73 Original 38.5KN/m Fungus Resistance ASTM G-21 28 days exposure No growth Shore A Hardness ASTM D 2240-75 48 Permanent Set 3M test method @ 250% strain 5 minute recovery Moisture Absorption 24hrs 90°C H 7 days 90°C H2O Wt. Gain 1.3% 3.2% Electrical Properties Dielectric Strength ASTM D 149-75 Original @ 1.78mm 19.1 MV/m 7 days in H 2O at 90°C 18.1MV/m Dielectric Constant Original 7 days 90°C H 5.0 5.6 Specifications Product Splicing of all 1000 volts or less inline power cables from 6mm2 to 500mm2 shall be done in accordance with the

Connector Insulators 8420 Series Data Sheet Electrical Markets Division 3M United Kingdom PLC 3M Irel and Ltd 3M United Kingdom PLC Sales Office Sales Office Head Office PO Box 393 The Iveagh Building, The Park, 3M Centre, Cain Road Bedford MK41 0YE Carrickmines, Dublin 18, Ireland Bracknell, Berkshire RG12 8HT Telephone: 0870 609 4639 Telephone: (01) 800 812 732 Telephone: 01344 858 000 Fax: 01234 229 433 Fax: 353 1 280 3509 Fax: 01344 858 758 instructions provided with 3M Brand PST Cold Shrink Connector Insulators. Engineering/Architectural The connector insulator must be capable of operation at emergency overload cable temperatures of 130°C. It must be usable without additional covering or adhesive, both indoors and outdoors, in overhead, direct buried or submersed applications, on cables rated up to 1000 volts. It must be applied without additional heat or flame and, when applied according to the manufacturer’s directions, but immediately energizable. It must not be adversely affected by moisture, mild acids or alkalis, ozone or ultraviolet light. It must be compatible with all rubber or plastic insulated 1000 volt cables. It must conform to the requirements of ANSI C119.1 1974, appropriate sections of Western Underground Guide 2.14 and UL 486D. It must have been accepted by the US Dept of Agriculture, Rural Electrification Administration, for both submersible and aerial application. Performance Tests The characteristic which is vital to the performance of the PST is permanent set. Permanent set is defined as “the percentage of the original stretched deformation not recovered in a given period of time after the deforming force (core) has been removed”. Because the PST tube has not been allowed to return to its original ID by the cable, a live rubber force exists between the cable insulation and the PST tube. The 8420 series tubes are installed on the core at approximately 250% stretch. The permanent set test is done in the tension mode and reflects the elastic memory property of the material. Field experience combined with laboratory test data has shown that our EPDM PST/Cold Shrink™ compounds exhibit excellent long-term elastic memory characteristics. Moisture, Heat and Seal Tests 3M Brand Connector Insulators meet or exceed the test requirements of UL486D and ANSI C119.1. Test Sequence. 1. 24 hours in room temperature water (30cm deep). 2. Insulation resistance at dc (500 to 1000V), 1 minute. 3. Dielectric ac withstand, 1 minute at 2200V. 4. Heat at 90°C (±5°C) for 72 hours. 5. Flex test: 10 cycles for 90° right and 90° left. 6. Twist test: twist 15° clockwise and then 15° counter-clockwise from centre 5 times. 7. Water immersion as in Step 1. 8. Insulation resistance as in Step 2. 10. Flex per Step 5. 11. Twist per Step 6. 12. Water immersion as in Step 1. 13. Insulation resistance as in Step 2. 14. Current cycle and water submersion test: a) Heat conductor with current to 90°C for 1 hour. b) De-energize. c) Plunge in 25°C (± 5°C) water within 3 minutes of Step b) for ½ hour minimum. d) Repeat Steps a), b) and c), 25 times. e) Measure insulation resistance per Step 2. f) Repeat Steps a), b) and c), 25 times. g) Dielectric test as in Step 3. 15. Dielectric withstand as in Step 3. PSTs will seal within 5 minutes at –1°C even on the absolute minimum cable size. Thus, warming with the hands is not necessary, even below freezing.