How to Create a Waterproof Electrical Connection

Added:

Problem Setup
Solution Design
Field Prep
Applying Potting
Silicone Filling
Material Mistake
Final Assembly
External Coating
Final Product

Problem Setup

0:06
Playing Section
  • 1

    Identifies failed underwater electrical connections in a fountain vault.

  • 2

    Explains the root cause as water permeating through the potting compound.

  • 3

    Introduces the goal of creating a 100% waterproof splice.

Basic electrical circuit principles, including the dangers of short circuits, grounding, and the electrical conductivity of water.
Wire preparation and joining techniques, such as stripping insulation, crimping, and soldering electrical conductors.
The physical properties and curing behaviors of polymers, specifically PVC, silicone adhesives, and epoxy resins.
Methods for testing seal integrity, such as hydrostatic pressure testing and insulation resistance testing using a megohmmeter.
Advanced encapsulation and potting techniques using specialized polyurethanes or marine-grade silicone compounds.
National Electrical Code (NEC) standards and Ingress Protection (IP) ratings for wet, damp, and submersed installations.
Principles of galvanic corrosion and how to select marine-grade materials (like tinned copper wire) for long-term underwater deployment.
51.9K views171likes49:40@KenTrainingOriginal Release: 2014-06-21

To create a waterproof underwater electrical connection, use a multi-layer approach: first make wire nut connections and saturate with potting compound, then fill the PVC housing with 100% pure silicone, seal pipe joints with PVC glue, and finally apply multiple coats of Pawn Shield epoxy waterproofing compound to the exterior surfaces. This comprehensive method prevents water infiltration that can cause electrical switch failure within 5-6 months, extending service life to 15+ years.