3M Scotch 24 Tape – Electrical Shielding Earthing Tape

3M Scotch 24 Tape - Electrical Shielding Earthing Tape

3M Scotch 24 Tape – Electrical Shielding Earthing Tape

Scotch 24

3M Scotch 24 Tape is an electrical shielding tape that is conformable due to the open-weave knit construction of two No.36 AWG tinned copper wires.

The Scotch 24 tape is a conducting metal tape which must be woven of No.36 AWG tinned copper wire and be capable of operating at the emergency cable temperature of 130°C/266°F.

The electrical shielding earth tape is non-flammable and can be compatible with cable oils, common solvents, adhesives and high voltage splicing and terminating insulations.

Availability: Contact Thorne & Derrick Sales for competitive prices and delivery from stock for 3M Scotch 24 tape.

Specification – 3M Scotch 24 Electrical Shielding Earthing Tape

Scotch 24 tape, manufactured by 3M Electrical, must be woven of No.36 AWG tinned copper wire and be capable of operating at the emergency cable temperature of 130°C/266°F. It must be usable uncovered, indoors and outdoors, in a highly stretched condition without corroding, tearing or splitting. It must be non-flammable and be compatible with cable oils, common solvents, adhesives, and high voltage splicing and terminating insulations.

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3M Scotch 24 Tape

3M Scotch 24 Tape

Electrical Shielding Earthing Tape Features

  • Tinned copper conductors
  • Stable at elevated temperatures
  • Oil resistant
  • Compatible with power cable insulations
  • Fire resistant
  • Elongates easily to conform to inclined or uneven surfaces
  • Corrosion resistant
  • Compatible with all high-voltage splicing and terminating materials
  • Unaffected by solvents, UV, ozone, and moisture
  • Due to its construction, the tape interlocks with the previous layer, thereby assuring a tighter wrap (no solder bead is required)
  • The porosity of Scotch 24 Tape will permit complete resin saturation when splicing
  • Usable for indoor and outdoor applications

3M Scotch 24 Tape

Applications

  • To provide shielding for cable joints on shielded power cables
  • To make the conductive portion of the stress cone on power cable terminations
  • To smooth connector area in oil-filled cables

Installation Techniques

  • When constructing tape terminations and splices, overwrap area according to 3M prints with one halflapped layer of Scotch 24 Tape to continue electrostatic shielding
  • When using resin-pressure methods, overwrap splice area with one quarter-lapped layer of Scotch 24 Tape
  • Solder Scotch 24 Tape ends to cable metallic shielding
  • CAUTION: “Scotch” 24 Tape should not be used as a ground strap or jumper wire. Its ampacity is not great enough to carry large fault currents
  • Note: A solder bead across 24 Tape is not necessary to hold it in place. Techniques for the proper use of this conductive tape are contained in standard and special prints available through the 3M Electro-Products Division Representative

3M Scotch 24 Tape

Electrical Shielding Earthing Tape Technical Specification

Physical Properties
Test Method Typical Value*
Thickness 0.406mm
Breaking Strength 38N/cm
Elongation 70
Weather Resistance
(Stretched and Unstretched)
Pass
Shelf Life Indefinite
Electrical Properties
Test Method Typical Value*
Electrical Resistance – (3M) 0.3Ω/M
Wire Size Two 0.0126sqmm
tinned copper wires
Chemical Properties
Ozone Resistant Pass
Water Absorption Zero
Resistance to Ultraviolet (3M) Pass
3M Scotch 24 Tape – Characteristics & Test Data
3M Scotch 24 Tape - Characteristics & Test Data

3M Scotch 24 Tape – Characteristics & Test Data

Tests were designed to determine how long a 12-inch specimen of Scotch 24 Tape would withstand a given amount of current before separating. A 200g weight was attached to the Scotch 24 Tape to ensure contact between the strands of the copper mesh. The test ended when Scotch 24 separated, due to the melting of the tinned copper wires.

Figure 2 above illustrates the results. The data indicates that Scotch 24 Tape has excellent current carrying capacities for replacing the electrostatic shielding in high-voltage cables. It should not be used as a ground strap or jumper wire because it will not carry the large fault currents and lightning currents that often appear in high voltage cables.

Figure 3 also above is representative of the method used for determining the resistance per foot of Scotch 24 Tape. The 200g weight was used to ensure contact between the interwoven No.36 wires. The resistance is .92 ohms for 10 feet of 24 Tape.

3M Scotch Electrical tapes including Scotch 24 are used to cable joint, splice, repair, seal and protect cables against abrasion, fire and corrosion – this includes LV-HV (11kV-33kV cables) – please contact T&D should you require assistance with selecting the correct tape.

Trademarks: 3M, Scotch, Scotchfil and Scotch 24 are all trademarks of 3M Company.

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