Couplings

What Is a Conduit Coupling?

A conduit coupling is a short fitting used to join two lengths of conduit end-to-end, creating a continuous, uninterrupted raceway for electrical wiring. Couplings are required any time a conduit run exceeds the length of a single stick of conduit, when a damaged section of conduit needs to be spliced, or when transitioning between conduit types within the same system.

The right coupling maintains the mechanical and environmental integrity of the entire conduit system — keeping moisture, dust, insects, and physical damage out of the conductors. Couplings are manufactured in a wide range of materials, connection styles, and trade sizes to match the specific conduit type, installation environment, and Canadian Electrical Code (CEC) requirements of each project.

Why Couplings Matter in Electrical Systems

Couplings are essential components in any conduit installation. Their primary purpose is to securely join two lengths of conduit to maintain a continuous and protected pathway for electrical wiring. A high-quality electrical coupling prevents moisture, dust, and mechanical damage while facilitating easy cable routing and code compliance. Choosing the wrong coupling type — or a poorly manufactured one — can compromise the entire raceway system, cause ground continuity failures in metallic systems, and lead to failed inspections.

Types of Couplings

EMT Couplings

EMT couplings connect sections of Electrical Metallic Tubing (EMT), the most widely used conduit type in commercial and residential construction. Set-screw EMT couplings use one or more screws to clamp the coupling to the conduit and are the standard choice for indoor, dry-location installations. EMT compression couplings use a threaded compression ring to create a rain-tight mechanical connection, making them the preferred option for outdoor, wet, and damp applications. Both styles are constructed from galvanized steel or zinc alloy and maintain electrical continuity across the conduit joint, which is essential for equipment grounding in metallic raceway systems.

Rigid Steel Couplings

Rigid steel couplings are threaded fittings designed to join sections of rigid galvanized steel (RGS) or intermediate metal conduit (IMC). Because rigid conduit is threaded at each end, rigid steel couplings thread onto both conduit ends to create a secure, mechanically strong joint. This makes them the go-to choice for heavy-duty applications requiring maximum physical protection — exposed exterior installations, service entrances, industrial environments, hazardous locations, and anywhere conduit is subject to significant impact or mechanical stress. Rigid steel couplings are manufactured from galvanized or coated steel for corrosion resistance and long service life.

Conduit to Flex Couplings

Conduit-to-flex couplings — also called transition fittings or combination couplings — are designed to connect rigid or semi-rigid conduit to flexible conduit at the point where the raceway system transitions from a fixed run to a flexible section. These couplings are commonly used at motor and equipment connections, HVAC unit terminations, and any location where vibration isolation or final equipment connection flexibility is required. They are available in combinations to suit transitions between EMT, rigid steel, or PVC conduit and either flexible metallic conduit (FMC) or liquid-tight flexible conduit (LFMC).

PVC Couplings

PVC couplings are lightweight, non-conductive fittings designed for use with rigid Schedule 40 or Schedule 80 PVC conduit. They are installed with solvent cement, which chemically bonds the coupling to the conduit ends, creating a watertight, permanent bond as strong as the conduit itself. PVC couplings are resistant to corrosion, moisture, and a wide range of chemicals, making them the standard choice for underground and direct-burial installations, outdoor exposed runs, wet locations, and corrosive environments such as water treatment facilities or agricultural buildings.

DBII Duct Couplings

DBII duct couplings are designed specifically for use with DBII (Type EB/DB2) PVC duct conduit — the heavy-wall, bell-end conduit used for direct-buried electrical duct banks, underground utility crossings, and municipal infrastructure projects. Unlike standard PVC conduit couplings, DBII duct couplings are engineered to handle the larger trade sizes, greater wall thickness, and higher mechanical loads typical of underground duct bank systems. They are solvent-cemented in the same manner as standard PVC couplings and provide a watertight, code-compliant joint for long-term underground service.

Flexible PVC (ENT/Corline) Couplings

Flexible PVC couplings — also referred to as ENT (Electrical Non-metallic Tubing) or Corline couplings — are designed to join sections of flexible corrugated PVC conduit used in concealed, within-wall, and above-ceiling installations. ENT is a lightweight, flexible, and cost-effective wiring method commonly used in wood-frame residential and light commercial construction. ENT couplings snap or push onto the corrugated exterior of the tubing to create a secure mechanical connection without solvent cement, significantly speeding up installation. They are non-conductive, lightweight, and suitable for dry and damp concealed locations as permitted by the CEC.

Conduit Coupling Options for Every Job

Whether connecting rigid PVC, EMT, or flexible conduit systems, we ensure customers can access the proper conduit coupling for their specific installation. Each coupling type is tested for quality and compliance, helping installers complete their work safely and efficiently.

Visit ewel.ca to browse the full selection of electrical coupling products, or visit a local branch for personalized assistance. Our staff is always ready to help customers find the right solution for any electrical installation.

Additionally, available in the online store are Conduits, Condulets & Entrance Caps, Elbows, Nipples, Reducing Bushings & Adapters, Straps & Spacers, PVC Boxes, PVC Covers, PVC End Caps & End Bells, PVC Conduit Accessories, Expansion Joints & Sleeves.