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Method for sealing cable tray elbows

Method for sealing cable tray elbows

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Cable tray elbows can be effectively sealed using cold-shrink EPDM rubber sleeves combined with mastic sealing strips to create a water-resistant and durable seal.

Recommended Sealing Method

1. Use of Cable Accessory Sealing Kits: Sealing kits, such as those provided by 3M, are designed specifically for cable elbows and other accessories. These kits typically include a pre-stretched cold-shrink EPDM rubber tube and mastic sealing strips. The mastic strips are applied around cable neutral wires or ground leads to ensure a complete seal . 2. Installation Procedure:

  • Place the mastic strips around the cable jacket or accessory connection points.
  • Position the pre-expanded cold-shrink tube over the cable jacket end or elbow.
  • Remove the inner supporting core of the tube, allowing it to shrink and form a tight, water-resistant seal.
  • For extended UV protection in outdoor applications, overwrap the sealed area with vinyl or silicone tape such as Scotch™ Super 33+ or Scotch™ 70 Silicone Tape . 3. Advantages:
  • No heat or torch is required, making it safe for field installation.
  • Compatible with common cable jacket materials including PVC, polyethylene, and EPR.
  • Suitable for indoor, outdoor, direct burial, aerial, and submersible applications.
  • Provides long-term protection against moisture, dust, and environmental contaminants . 4. Additional Considerations:
  • Ensure the cable tray elbow is properly fabricated and aligned before sealing. For 90° or 45° bends, follow standard fabrication methods to maintain correct dimensions and angles .
  • Verify that the sealing kit matches the cable diameter and type to ensure a proper fit.
  • Regular inspection and maintenance may be required in harsh environments to maintain the integrity of the seal. By following this method, cable tray elbows can be reliably sealed, protecting the cables and maintaining system integrity in various installation environments.
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