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Technical Information
1.1 Electrical Nonmetallic Tubing (ENT), is designed to replace EMT, flexible metal conduit or other raceway or
cable systems, for installation in accordance with Article 362 of the National Electrical Code, other applicable
sections of the Code, and local codes.
1.2 Any ENT used shall meet the requirements of UL Standard UL 1653 and shall be listed by Underwriters
Laboratories, Inc., as suitable for its intended purpose.
1.3 ENT shall be recognized by a National Evaluation Report for use in 1-hour and 2-hour rated construction.
1.4 Penetration of fire rated walls, floors or ceilings shall use classified Through-Penetration Firestop Systems
described in the current Underwriters Laboratories Fire Resistance Directory.
1.5 Fittings and outlet boxes shall be designed for use with ENT and listed by Underwriters Laboratories. All
fittings, boxes and accessories shall be from one manufacturer.
1.6 Only Carlon ENT Blue cement recommended specifically for use with ENT shall be used.
1.7 Unless indicated differently on drawings, ENT systems shall be color coded: BLUE for branch and feeder circuit
wiring, YELLOW for communications, and RED for fire alarm and emergency systems.
1.8 ENT, fittings, and accessories shall be manufactured by Carlon.
1. Cut ENT square and cleanly.
2. Insert end into fitting, making sure two (2) full
corrugations are snapped into fitting beyond
flexible tabs (2 clicks).
3. ENT should be tied to rebar at 2-3 foot intervals
to prevent flotation. Keep ENT straight. Small
deflections over a long run may accumulate
significant degrees of bend which will affect
conductor installation. Suitable materials
include wire, tie wraps, and tape.
4. When using UL solvent weld fittings for
concrete tight performance:
A. Do not use chemical primer or cleaner.
B. Apply a light, uniform coat of cement
labeled for use with ENT on the coupling
and ENT.
C. Do not use a dauber.
D. Brush excess cement out of ENT grooves.
E. Promptly insert ENT
into fitting while
cement is wet, until
the stop is reached,
and give a quarter
turn.
F. Do not disturb until
joint is set.
Concrete Encasement Guidelines
Specifications
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