Cor-Line® ENT

Blue stripe Cor-line ENT tubing

IPEX Electrical Inc.

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Cor-Line® Electrical Nonmetallic Tubing (ENT) for concrete slab construction

Noncorroding and nonconducting, Cor-Line Electrical Nonmetallic Tubing (ENT) is engineered for the rugged day-to-day challenges of the construction industry – whether encased in concrete, concealed in walls or ceilings, or in direct burial applications. Cor-Line ENT’s corrugated construction allows it to be bent easily by hand requiring no special bending equipment. And our unique Kwikon couplings and connectors snap together to create a total integrated system that saves you time and money on the job.

Lightweight and flexible, Cor-Line ENT is quick and easy to install reducing labour by up to 50% and is conveniently available in 10’ sticks, coils or long reels.

Cor-line ENT Interior Installation

product details

Savings in the long run

We designed Cor-Line® Electrical Nonmetallic Tubing (ENT), and Kwikon® fittings, slab boxes and accessories with two goals. Firstly, we set out to create an integrated ENT system tough enough to meet the rugged day-to-day challenges of the construction industry. More importantly, we wanted to make a system that saves time and money on the job site. People who work with it daily insist we got it right on both counts.

Hospital outside view


Typical Installations

  • Walls: Cor-line’s flexibility and ease of handling in metal, wood or block walls
  • Floor / Ceiling Assemblies: Cor-Line’s light weight and versatility make it perfect for slab applications. Integrated with our slab boxes
  • Clean Connection: Kwikon ENT Stubbies provide a clean 1-1/2” stub of ENT to make your connection while protecting the ENT from the traditional breakage that can occur when the forms are removed
  • In slab Floors: With its concrete-tight design and easy-to install angled stubbies, Cor-Line and Kwikon offer the perfect ENT solution for in slab floors
Electrical non-metallic tubing Cor-Line ENT with square slab box


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Product Details


1.1 References

A. Standards referred to in this section are:

CSA Standards C22.2, No. 227.1 and C22.2 No. 85.
NEMA TC-13 Electrical Nonmetallic Tubing.


2.1 Manufacturers

A. Acceptable manufacturers are listed below

1. Electrical Nonmetallic Tubing:
a. Cor-Line by IPEX
2. Electrical Nonmetallic Tubing Fittings:
a. Kwikon by IPEX
3. Electrical Nonmetallic Tubing Boxes:
a. Kwikon by IPEX
B. All ENT tubing, ENT fittings, ENT boxes and accessories shall be manufactured by the same company so as to form a complete ENT system.

C. ENT systems shall be approved for use in fire resistance rated concrete floor-ceiling assemblies with fire resistance ratings up to 4 hours.

2.2 Raceways

A. ENT raceway shall be listed to CSA C22.2 No. 227.1 and manufactured in accordance with NEMA TC-13.

2.3 Fittings

A. ENT Fittings shall be manufactured of high-impact PVC.

B. ENT Fittings shall meet the following requirements:

Six locking tabs located every 60º providing 360º contact.
Locking tabs shall provide a conduit pullout of a minimum 175 ft-lb force.
Concrete tight without the need for taping.
When transitioning to EMT conduit, the transition fitting shall have six locking tabs for ENT connection and set-screw connection for EMT.

2.4 Boxes

A. ENT boxes shall be manufactured of high-impact PVC.

B. ENT Slab Box and Wall Box requirements:

Slab Boxes shall be approved for the purpose and concrete-tight.
Round Slab Boxes shall be approved for use with luminaires up to 50 lbs and ceiling fans up to 35 lbs.
Round Slab Boxes shall have threaded brass inserts for the attachment of luminaires or ceiling fans.
Slab Boxes shall have eight (8) integrally molded ENT hub connectors with six locking tabs for ENT raceway connection.


3.1 Installation

A. ENT raceways, fittings, boxes and accessories shall be installed in accordance with the 2009 Canadian Electrical Code, Part 1 – C22.1-02 (CEC) and the 1995 National Building Code of Canada (NBC).

B. Where ENT penetrates a fire-rated wall, floor or ceiling assembly, an approved firestop system is CSA certified to CSA Standards C22.2, No. 211.0.

See Codes & Standards for additional installation information.



1⁄2″ – 2-1⁄2″

Not to be installed, stored, or handled in cold temperatures below -20°C (-4°F)
Not to be stored outside

CSA Standards C22.2
FT-4 rated for use in non-combustible construction

Residential (Low or High Rise)
Commercial (Low or High Rise)
Institutional (Prisons, Schools, Universities)
Hospitals and Nursing Homes
Stadiums and Arenas

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