What Are Non-Metallic Liquid Tight?

Non-metallic liquid tight products generally refer to flexible non-metallic conduit and matching fittings used to protect insulated conductors in wet or damp locations and in areas where a sealed raceway connection is needed. Unlike metallic liquid tight conduit, the raceway body is non-metallic, which can make it a good fit where corrosion resistance is important or where a non-metallic system is preferred around certain chemicals or washdown conditions. In practice, these products are often selected for short equipment connections rather than long straight distribution runs.

Where Are Non-Metallic Liquid Tight Used?

Typical applications include air conditioners, heat pumps, condensers, pumps, fans, rooftop equipment, irrigation controls, outdoor signs, car wash equipment, food and beverage areas, and machinery connections subject to vibration or movement. They are also used in commercial and industrial control wiring where moisture, splash, or corrosive conditions make standard dry-location raceways a poor fit. In residential work, they may be used for specific outdoor or wet-location equipment connections where permitted and properly supported.

How To Choose Non-Metallic Liquid Tight

Start with the environment. If the run is exposed to water, washdown, sunlight, oils, or corrosive conditions, confirm the conduit and fittings are suitable for that exposure. Next, look at flexibility. Tight equipment spaces and vibrating loads often favour a more flexible raceway, but very flexible conduit can be less pleasant on long pulls. Then check conductor count and size so the raceway is not undersized. Also consider fitting style, straight versus 45 deg or 90 deg connectors, thread type, and whether you need a sealing locknut or gasketed entry. If physical abuse is likely, compare non-metallic liquid tight against metallic liquid tight, PVC conduit, or another wiring method that offers more mechanical protection.

Trade Rules Of Thumb

As a practical rule, non-metallic liquid tight is often most efficient for short final connections rather than long conduit systems with many bends. Another common rule of thumb is to avoid making the raceway do the work of poor equipment layout. If the connection needs multiple sharp turns, a junction box or a different raceway route may save labour. For outdoor equipment, many contractors prefer to size one step up when conductor fill is already tight, because it makes pulling easier and reduces stress at fittings. These are typical trade practices only and are not a substitute for manufacturer instructions or code requirements.

Sizing Guidelines

Size the conduit from the actual conductor quantity, insulation type, and outside diameter, not just from habit. A common buying mistake is assuming a familiar trade size will always work for control conductors, bonding conductors, or mixed conductor sets. Conduit fill concepts still matter, and larger wire insulation or extra control pairs can change the answer quickly. Also account for fitting throat size and bend radius, especially on short whips into disconnects, motors, or rooftop units. Where exact fill, ampacity, derating, bonding, or support rules affect the installation, verify the design against the Canadian Electrical Code and the conduit manufacturer data before purchase or installation.

Common Installation Practices

Good installations usually keep runs as short and direct as practical, support the conduit properly, avoid unnecessary twisting, and use listed liquid tight fittings matched to the conduit type. Installers commonly cut the conduit cleanly, check that the fitting engages correctly, and make sure sealing components are seated before tightening. At equipment entries, it is common to confirm enclosure ratings, hub compatibility, and whether a sealing washer or locknut arrangement is needed. In wet areas, attention to entry points matters as much as the conduit itself. Poorly chosen fittings or loose terminations are a common cause of water ingress.

Common Mistakes

Frequent mistakes include mixing incompatible conduit and fittings, undersizing the raceway, using non-metallic liquid tight where the area is subject to impact damage, and assuming all flexible conduit is equally resistant to sunlight, oil, or chemicals. Another issue is overbending the conduit near the connector, which can stress the fitting and make conductor pulling harder. Buyers also sometimes focus only on conduit price and forget the labour effect of fitting quality, ease of assembly, and rework risk. On service calls and maintenance jobs, matching the existing system and fitting style can save time and reduce surprises.

Brand Comparisons

Bridgeport is a well-known name for fittings and is commonly considered when contractors want dependable connection hardware for standard commercial and industrial work. Wheatland, T&B, and Atkore are also widely recognized in the broader raceway and fittings market, and many buyers cross-shop them based on installed base, availability, and job spec requirements. If you are matching an existing installation, staying with the same brand family may simplify fit and finish expectations. Bridgeport can be a sensible choice for many everyday applications where fitting quality and familiarity matter, while some buyers may still prefer another listed brand when a project spec, customer standard, or existing site inventory points that way.

Related Products

Common companion items include liquid tight straight connectors, 45 deg and 90 deg fittings, locknuts, sealing washers, hubs, junction boxes, disconnects, cord grips, support straps, and conductors rated for the environment. Depending on the job, buyers may also compare non-metallic liquid tight with metallic liquid tight conduit, PVC conduit and fittings, flexible metallic conduit, or tray cable methods. For equipment terminations, it is worth checking enclosure entries and accessories at the same time so the full connection can be completed without a second order.

Frequently Asked Questions

Is non-metallic liquid tight conduit the same as metallic liquid tight?

No. Both are used for flexible wet-location style connections, but non-metallic liquid tight is generally chosen where corrosion resistance and non-metallic construction are priorities, while metallic liquid tight may be preferred where greater mechanical protection is needed.

When should I choose non-metallic liquid tight instead of PVC conduit?

Choose non-metallic liquid tight when the connection needs flexibility, such as at vibrating equipment, moving machinery, or awkward final terminations. PVC conduit is usually better for fixed straight runs where rigidity and physical support are more important.

Can I use any fitting with non-metallic liquid tight conduit?

No. Use fittings listed and intended for the specific conduit type. Liquid tight performance depends on the conduit and fitting working together as a system.

Is larger conduit ever worth the extra cost?

Often yes. On short equipment whips the material difference may be small, but the labour savings from easier pulling and less stress at fittings can make the larger size worthwhile.

What should I confirm before ordering for an outdoor equipment connection?

Check the environment, sunlight exposure, conductor count and size, fitting angle, enclosure entry method, and whether the installation needs sealing accessories. Also confirm the selected wiring method is acceptable for the specific equipment and location under the Canadian Electrical Code.