Rubber Electrical Tapes – Guide and How to select

//Rubber Electrical Tapes – Guide and How to select

Rubber Electrical Tapes – Guide and How to select

Chapter 4

This article is part of ‘The Guide to Electrical Tape’

4 Factors to consider when choosing a Rubber Electrical Tapes

Proper wrapping
Moisture control
High temperature performance
Extra padding

Proper wrapping

Shouldn’t snap when you wrap.

Wrapping tape on a high voltage cable can be time consuming and error prone since the careful build-up of tape requires accurate half-lapping and constant tension in order to reduce build-in air voids.  Rubber tapes are designed to stretch−some up to 1000%. Elongating the tape this way drives to compression, and that results in the strong self-fusion that provides great insulation and moisture protection.

In a typical tape splice, you’ll tug and pull out the tape, stretching it to just before the breaking point. The tape’s width narrows to about 1/3rd of its original size. The tape’s length increases; your hand travels very quickly up to 20” away from where you started. Quite often you’ll be wrapping in a tight location making this even more difficult. Proper taping techniques are critical to realizing the many performance benefits of rubber tape.

  • Backwinding rubber tape allows you to tuck the excess back onto the roll as you work, pacing out more as you make your half laps around the cable and helping prevent the tape from getting progressively further away from the work area.
  • Even pressure on the stretch helps eliminate voids and bulges, sometimes called ‘pregnant splices’.
  • A good rubber tape won’t snap and break when you wrap.
  • Splices and terminations should always be jacketed with vinyl tape for protection from chemical contaminants and physical damage. Vinyl jackets help keep your cable from collecting debris.
  • Dielectric strength of rubber tape increases as you add layers. For low-voltage applications (<600V), always apply a minimum of 2½ half-lapped layers.

Moisture control

Self-bonding helps makes an air and watertight seal.

Rubber tapes repel moisture and are a great solution for outdoor applications or in manholes where water may occasionally seep in.

In production plants and manufacturing facilities where steam, dripping water and elevated humidity are present, self-fusing rubber tapes provide much needed moisture protection.

In a harsh environment, one that is subject to chemical and harsh fluid exposure; overwrap with a hearty vinyl tape to help prevent copper corrosion.

High Temperature Performance

Engineered to beat the heat.

Anyone who’s left a roll of general purpose vinyl tape in the cab of their truck on a very hot summer day can attest to the fact that heat makes the adhesive soft. Extreme heat makes it ooze and flow.

Extra Padding

Thicker for Padding. Designed to take the shake.

Engines and motors in a production line subject electrical connections to extreme vibrations. Rubber tapes are typically 4 times thicker than vinyl electrical tapes and provide extra mechanical protection for connections like motor leads that are subject to constant vibrations. They also provide excellent padding and conformability around surfaces with irregular, rough or sharp edges like bus bar and split bolt connections.

Example of choosing Rubber Electrical Tapes with 3M

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By |2018-10-16T10:53:28+00:00August 30th, 2018|Cable and Joints|