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Questions about ENT
1. WHAT IS ENT?
ENT is a pliable, nonmetallic raceway manufactured of
the same material (PVC) used for rigid nonmetallic
conduit.
2. IS ENT UL LISTED?
Yes. See UL Listing No. E73317 for
1
/2 inch through 2 inch
ENT
3. IS ENT RECOGNIZED BY THE NEC?
Yes. See Article 362 (Article 331 of the NEC) – Electrical
Nonmetallic Tubing (see Section 10 of this manual.)
4. ARE THERE ANY OTHER NATIONAL
ORGANIZATIONS THAT RECOGNIZE THE USE
OF ENT?
Yes. CABO – The Council of American Building Officials.
5. HOW LONG HAS ENT BEEN IN EXISTENCE?
Carlon introduced ENT in 1980 and is presently the
largest manufacturer of all PVC conduit, boxes and
fittings.
6. WHAT IS THE FIRE RATING OF ENT?
BOCA, SBCCI and ICBO recognize the use of ENT in a one
and two hour fire rated Wall Assembly and up to a three
hour rated Floor/Ceiling Assembly. (Reference ER-5644 or
NER-290).
7. IS THERE ANY CONCERN REGARDING THE
TOXICITY OF ENT DURING A FIRE?
a. PVC raceways have never caused death in a fire
situation, however, improperly grounded steel raceways
have ignited fires by arcing and sparking.
b. Smoke from ENT raceways is no more hazardous than
smoke from other materials commonly used in the