3M Scotch 25 Tape – Electrical Shielding Earthing Tape

3M Scotch 25 Tape - Electrical Shielding Earthing Tape

3M Scotch 25 Tape – Electrical Shielding Earthing Tape

Scotch 25

3M Scotch 25 Tape is an electrical shielding tape that is conformable due to its woven construction of 240 strands of #30 AWG tinned copper wires.

Scotch 25 Electrical Grounding Braid is an all-metal woven grounding braid in a flat, cable-like form.

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 25 tape.

Specification – 3M Scotch 25 Electrical Shielding Earthing Tape

Scotch 54 tape, manufactured by 3M Electrical, conducting metal braid must be woven from 240 strands of #30 AWG tinned copper wires and be capable of carrying fault current comparable to that of #6 AWG copper wire. 3M Scotch 25 tape should be used with or without covering, both indoors and outdoors, without corroding, tearing or splitting. It must be capable of being soldered to highvoltage cable shields while being non-flammable and yet must be compatible with cable oils, common solvents, adhesives and high-voltage jointing and terminating insulations.

3M Scotch Tapes

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3M Scotch 25 Tape

3M Scotch 25 Tape - Electrical Shielding Earthing Tape

Electrical Shielding Earthing Tape Features

  • High current-carrying capacity (approximately that of #6 AWG wire)
  • Tinned copper wires
  • Stable at elevated temperatures
  • Oil resistant
  • Compatible with all power cable installations
  • Fire resistant
  • Easy conformity to irregular surfaces
  • Corrosion resistant
  • Compatible with high-voltage jointing and termination materials
  • Unaffected by solvents, ultra-violet, ozone, and moisture
  • Usable for indoor and outdoor applications
  • Can be easily soldered to high-voltage cable shields

3M Scotch 25 Tape

Applications

  • To provide shielding for cable joints on shielded power cables
  • For grounding high-voltage joints, terminations, cables or other cable accessories

Installation Techniques

  • Solder Scotch 25 Ground Braid to cable metallic shields and bring remainder of braid out of joint or termination
  • Construct a 51mm solder block on ground braid to prevent moisture penetration into joint
  • See Figure 4 below – Wrap two half-lapped layers of Scotch 130C Rubber Jointing Tape, covering the end 51mm of cable jacket
  • Wrap two half-lapped layers of 130 Tape for 76mm along ground braid, beginning at a point where ground is soldered to shield
  • Lay ground braid over 130C Tape applied on jacket for 25mm then bend strap away from cable
  • Apply outer sheath over ground braid
  • For bonding jumper wire across joint, lay Scotch 25 Ground Braid across joint and solder ends to cable’s metallic shielding

3M Scotch 25 Tape

Electrical Shielding Earthing Tape Technical Specification

Physical Properties
Test Method Typical Value*
Thickness 2.38mm
Width 12.7mm
Shelf life Indefinite
Electrical Properties
Test Method Typical Value*
Wire size 240 #30 AWG tinned copper wires
Approximate AWG rating #6
Chemical Properties
Ozone Resistant Pass
Resistance to Ultraviolet (3M) Pass
3M Scotch 25 Tape – Characteristics & Test Data
3M Scotch 25 Tape - Characteristics & Test Data

3M Scotch 25 Tape – Characteristics & Test Data

Test method, as show in Figure 1 above was designed to determine fault current carrying capacity of a 30.5cm specimen of the Scotch 25 tape braid. The test ended when the braid separated, due to melting of tinned copper wires. Graph Figure 2 above illustrates the results.

The data indicate that 25 tape braid has excellent fault current carrying capacities for replacing shielding in high-voltage cables. It can be used as a ground strap or jumper wire because it can carry fault currents and lightning currents that can appear in high-voltage cables. Figure 3 above is representative of the method used for testing fault current carrying capacities of Scotch 25 tape braid in a high-voltage cable joint.

Every cable tested had a single half-lapped layer of 19mm x 0.13mm tinned copper metallic shielding tape for fault current protection. In all cases, the cable’s metallic shield was destroyed (by current), whereas, grounding braid remained unharmed.

3M Scotch Electrical tapes including Scotch 25 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 25 are all trademarks of 3M Company.

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