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Section 5

Exposed Construction

Reference NEC Section 362.10: The use of electrical

nonmetallic tubing and fittings shall be permitted:

(1) In any building not exceeding three floors above grade.

a. For exposed work, where not prohibited by 362.12(10).

b. Concealed within walls, floors, and ceilings.

(2) In any building exceeding three floors above grade,

ENT shall be concealed within walls, floors, and ceilings

where the walls, floors, and ceilings provide a thermal

barrier of material that has at least a 15-minute finish

rating as identified in listings of fire-rated assemblies.

The 15-minute-finish-rated thermal barrier shall be

permitted to be used for combustible or noncombustible

walls, floors, and ceilings.

Questions About ENT

1. WHAT DOES “NOT SUBJECT TO PHYSICAL

DAMAGE” MEAN?

It means the normal activity in the area where the

installation is located is such that it would not damage

the installation. In locations where ENT would be exposed

to physical damage, guards must be installed to provide

protection and be arranged to prevent such damage.

2. WHERE CAN I RUN ENT EXPOSED?

You can run ENT exposed in commercial buildings, ware-

houses, self storage buildings, condominiums, apartments,

hotel/motel complexes, schools, and other structures

where the building is not over three floors above grade.

3. EXACTLY WHAT IS EXPOSED CONSTRUCTION?

Exposed construction is where you can see the ENT and

boxes when construction is complete, i.e., attic crawl spaces

where ENT is fastened to studs, and in warehouses where

ENT is fastened to steel trusses to feed hi-bay fixtures.

ARE THERE ANY SPECIAL REQUIREMENTS WHEN

RUNNING FROM A PANEL INTO A FREEZER?

Yes. The conduit must be sealed to prevent air circulation

(see NEC Article 300.7, Section 10 of this manual.)