Conduit & Fittings

What Are Conduit & Fittings?

Conduit is a raceway system used to route and protect insulated conductors. Fittings are the components that join, terminate, support, seal, or adapt that raceway. In practice, this category includes PVC conduit systems, EMT systems, flexible conduit, liquidtight conduit, and the hardware needed to connect them to boxes, enclosures, panels, and equipment. Fittings may include set-screw or compression connectors, couplings, male adapters, terminal adapters, locknuts, insulated bushings, expansion fittings, straps, clamps, and sealing components. The correct combination depends on the conduit material, whether the raceway is threaded or non-threaded, and the conditions of use.

Where Are Conduit & Fittings Used?

Conduit and fittings are used anywhere conductors need mechanical protection, a defined routing path, or a more serviceable wiring method than direct cable. Common applications include exposed branch circuits in commercial spaces, feeder runs in industrial plants, rooftop mechanical connections, service areas, parking structures, agricultural buildings, utility rooms, and outdoor site work. PVC conduit is common below grade, in concrete, and in corrosive environments. EMT is widely used indoors for exposed work in commercial and institutional buildings. Flexible and liquidtight systems are often used for final connections to motors, pumps, HVAC equipment, and machinery where vibration or movement is expected. The fitting choice matters as much as the conduit choice because the weak point in many installations is the termination, not the raceway body.

How To Choose Conduit & Fittings

Start with the environment. If the run is underground, in concrete, or exposed to moisture and corrosion, PVC conduit and compatible fittings are often the practical starting point. If the run is indoors, exposed, and needs a neat commercial finish with relatively fast installation, EMT is commonly preferred. If the connection is to vibrating equipment or requires flexibility for alignment, flexible metal conduit or liquidtight conduit may be more suitable. Next, confirm the conductor quantity and size so the raceway can be sized realistically. Then review the route: long pulls, multiple bends, and tight equipment spaces may justify upsizing the conduit even when minimum fill would technically fit. Finally, match the fittings to the exact conduit type, trade size, enclosure entry, and environmental rating. A low-cost fitting that saves a few dollars can create labour issues, poor bonding, water entry, or premature failure if it is the wrong style for the job.

Trade Rules Of Thumb

A common planning rule is to avoid sizing conduit right at the theoretical minimum when the run has several bends or future conductor changes are likely. Many electricians prefer some working room because easier pulls usually save more labour than the extra conduit cost. For multiple conductors, 40 percent fill is a common maximum-fill concept used in raceway planning, but actual allowable fill and conductor ampacity adjustments must be checked against the applicable code tables and manufacturer data. Another practical rule is that bend count and pull distance matter as much as conduit diameter. A short straight run may be easy in a tighter raceway, while a long run with offsets and 90 deg bends may justify the next size up. For outdoor PVC runs, allow for expansion and contraction where temperature swing and run length make movement significant. These are practical guidelines only, not code substitutes.

Sizing Guidelines

Conduit sizing should begin with conductor count, conductor size, insulation type, and whether the raceway is a complete run or a short equipment connection. As a practical buying guide, small control or signal bundles may fit comfortably in smaller raceways, while feeder conductors, parallel runs, or circuits with larger bonding conductors can push the raceway size up quickly. If the installation includes several bends, long pull boxes may be absent, or conductors are likely to be replaced later, upsizing one trade size is often a sensible labour-saving decision. Fitting sizing must match the conduit trade size exactly, and thread type or connection style must also match. Do not assume all 1/2 in. or 3/4 in. fittings are interchangeable across EMT, PVC, liquidtight, and rigid systems. Final sizing, fill, derating, and support spacing must be verified to the Canadian Electrical Code, local authority requirements, and product listings.

Common Installation Practices

Good conduit work starts with route planning. Installers typically minimise unnecessary bends, keep box offsets consistent, and place supports where the run stays straight and mechanically secure. EMT installations often use set-screw or compression fittings depending on location and specification preference, with attention to bonding continuity and enclosure fit. PVC installations commonly require clean cuts, proper deburring, correct solvent cement practice where applicable, and allowance for thermal movement on longer exposed runs. Flexible and liquidtight conduit are usually kept to practical lengths for equipment connection rather than used as a substitute for a full fixed raceway system. Across all systems, deburring raceway ends, protecting conductor entries with bushings where required, and using the correct locknuts, sealing washers, or hubs can prevent conductor damage and moisture problems. Product instructions and inspection requirements should always govern the final installation method.

Common Mistakes

One common mistake is choosing conduit by habit instead of by environment. EMT may be fast indoors but may not be the right answer for corrosive or continuously wet locations. Another is mixing fittings and raceway types incorrectly, such as using a connector style not listed for the conduit being installed. Undersizing is also common, especially when buyers look only at conductor fit and not at pull difficulty, bend count, or future maintenance. On PVC jobs, failing to account for expansion, poor support layout, or rough cut ends can create long-term issues. On flexible and liquidtight runs, overusing flex for long distances can lead to untidy work and support problems. A final frequent issue is assuming all brands and fitting patterns install the same way. Small differences in locknut depth, sealing method, or connector body design can affect labour and enclosure space.

Brand Comparisons

IPEX is one of the most recognised names for PVC conduit systems in Canada, and IPEX Scepter is commonly specified where non-metallic raceway is preferred. Bridgeport Fittings is widely known for metallic fittings and is often cross-shopped where installers want dependable EMT and box connection hardware. Hubbell and Raco/Hubbell are familiar choices for boxes, covers, and many raceway accessories, especially when matching existing installed material matters. ABB/T and B/Iberville, Appleton, and Crouse-Hinds/Eaton are often seen on industrial and specification-driven projects, particularly where legacy standards, hazardous-location accessories, or plant consistency are factors. In Aptico's available range, Ipex is a strong fit for many PVC raceway applications, while Bridgeport Fittings, Hubbell, and Topaz can be practical options for common fittings and hardware. Gardner Bender is often considered for general electrical accessories and jobsite consumable needs. Superflex/Sealproof Ltd may be preferred where flexible liquidtight connections are the priority. Matching an existing installed brand can be the right move when fit, finish, or maintenance standardisation matters, while a comparable alternative may be suitable for many standard commercial and light industrial applications if listing, compatibility, and specification requirements are met.

Related Products

Conduit and fittings are usually purchased alongside boxes and enclosures, locknuts and bushings, straps and clamps, pull boxes, wire connectors, grounding and bonding components, cable ties, identification products, and conductors. For PVC systems, buyers often also need solvent cement, expansion fittings, and adapters for transitions into boxes or equipment. For EMT and metallic systems, common add-ons include couplings, compression or set-screw connectors, insulated throats, bonding bushings, and support hardware. For equipment terminations, liquidtight connectors, cord grips, and sealing accessories are often part of the same takeoff. If the project includes control panels or industrial equipment, DIN rail accessories, terminal blocks, and wire duct may also be part of the same material package.

Frequently Asked Questions

What is the difference between EMT and PVC conduit?

EMT is a metallic raceway commonly used for exposed indoor work where a neat appearance and fast installation matter. PVC is a non-metallic raceway often chosen for underground, concrete, wet, or corrosive environments. The better choice depends on the location, support method, bonding requirements, and mechanical exposure.

Can I use the same fittings for all conduit types?

No. Fittings must be listed and designed for the specific conduit type and trade size. EMT, PVC, liquidtight flex, and threaded rigid systems use different connection methods, and mixing them incorrectly can create bonding, sealing, or mechanical problems.

Should I upsize conduit beyond the minimum fill calculation?

Often yes, especially on longer runs, runs with several bends, or installations where conductors may be replaced later. Minimum fill may be technically acceptable in some cases, but a slightly larger raceway can reduce pulling effort and save labour. Final sizing still needs to be checked against code and product requirements.

When is liquidtight conduit a good choice?

Liquidtight conduit is commonly used for final connections to motors, pumps, rooftop units, and other equipment where moisture, vibration, or slight movement is expected. It is usually best for equipment connections rather than long straight distribution runs unless the application specifically calls for it.

Do outdoor PVC conduit runs need expansion fittings?

They can, depending on run length, temperature swing, and how the conduit is mounted. Exposed PVC can expand and contract noticeably with temperature changes. The need for expansion fittings should be determined from manufacturer guidance and the installation conditions, not by guesswork.

What should buyers check before ordering conduit fittings?

Confirm the conduit type, trade size, connection style, enclosure entry size, environmental conditions, and whether bonding or sealing features are required. It is also worth checking whether the project specification calls for a particular fitting style, such as compression instead of set-screw, or a particular brand family for consistency.