Cables inside the electrical well are fixed in the cable tray

Cables inside an electrical well are commonly supported and organized using cable trays, which provide secure, accessible, and code-compliant routing for electrical wiring.

Purpose and Benefits

Cable trays in electrical wells serve as a support system for power, control, and communication cables, ensuring they are mechanically secured and protected from sagging or damage while allowing easy access for maintenance or future expansion (Romtec Utilities). In wet wells, cable trays create a protected pathway from pumps or in-well equipment to control or disconnect panels, enabling safe disconnection without severing cables and reducing the need for licensed electricians for routine maintenance.

Installation and Standards

Cable trays can be installed horizontally or vertically inside wells, and cables must be fastened securely to maintain integrity over the life of the installation, typically 25–30 years or more. The National Electrical Code (NEC) Article 392 governs cable tray installations, specifying requirements for tray construction, load ratings, cable types, spacing, bonding, and securement. For example, single conductor cables 1/0 AWG to 4/0 AWG have maximum rung spacing of 9 inches, and cables must be secured at intervals according to manufacturer instructions.

Types and Materials

Cable trays come in various types, including ladder, solid-bottom, ventilated, and wire mesh trays, each suited for different cable types and environmental conditions. Materials like aluminum are commonly used for wet well installations due to corrosion resistance and structural strength, and trays can be integrated into top slabs or walls for a nearly seamless installation.

Best Practices

Secure cables to transverse members or rungs to prevent stress and movement. Maintain proper fill levels; vertical and horizontal trays have similar fill requirements. Use listed cable ties or fasteners suitable for the cable type.

Avoid using trays as walkways or ladders, as they are designed solely for cable support. Plan for future expansion, leaving space for additional cables without major modifications. Using cable trays in electrical wells ensures organized, safe, and maintainable cable routing, reduces operational costs, and complies with electrical codes and industry best practices.