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8. WHAT IF I NEED TO RUN THROUGH THE STEEL
STUD AND THERE ARE NO HOLES?
Carlon suggests purchasing a stud punch and put the
holes where you need them.
9. WHAT IF A BUILDING THAT IS SEVEN FLOORS
HIGH REQUIRES THE USE OF ENT, BUT THE NEC
SAYS IT SHALL NOT EXCEED THREE FLOORS
ABOVE GRADE?
Section 362.10(1) covers exposed work only. “On or
attached to the surface...” There is a three floor limit for
exposed work. Section 362.10(2) covers concealed work.
“Concealed within walls, floors and ceilings...which have
at least a 15 minute finish rating.” There is no height
limit for the installation of concealed ENT.
10. IN A MULTI-TENANT BUILDING, THERE IS AN
AUDITORIUM SEATING 110 PEOPLE AND TWO
SMALL THEATERS, CAN I USE ENT?
Yes, in 2 inches of concrete. Refer to Article 518 – Places of
Assembly, and Article 520 – Theaters and similar locations.
11. CAN I USE ENT FOR RISERS FOR
COMMUNICATION, FIRE ALARM AND POWER?
Yes. Risers up to 2 inches may be installed as long as the
supports for ENT (3 feet on center) are not exceeded and
the wires within the ENT are supported in accordance
with NEC Section 300.19.
12. WHILE INSTALLING A RISER THROUGH A
FIRE-RESISTIVE FLOOR, ARE THERE ANY
SEALING REQUIREMENTS?
Yes. All openings must be fire-stopped (see NEC Section
300.21, Section 10 of this manual).
ENT installed in metal stud wall