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Section 4

Masonry Construction

Reference NEC Section 362.10 Uses Permitted:

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.

(see Section 3, Table 3-1 in this manual). The 15-minute-

finish-rated thermal barrier shall be permitted to be

used for combustible or noncombustible walls, floors,

and ceilings.

Exception: Where a fire sprinkler system(s) is installed in

accordance with NFPA 13-1999, Standard for the Installation

of Sprinkler Systems, on all floors, ENT is permitted to be

used within walls, floors, and ceilings, exposed or concealed,

in buildings exceeding three floors above grade.

Questions About ENT

1. CAN I USE CARLON ENT IN BLOCK WALL?

Yes. The installation of ENT in block walls requires less

lifting of blocks by the mason. The pliable construction of

ENT allows for bending and threading through the block

cavity at a convenient work height.

2. WHAT ARE THE ADVANTAGES OF USING RIGID

CONDUIT VS. ENT IN A MASONRY WALL?

There are none. Read on:

a. If the receptacles are fed from overhead it provides a

length of conduit from the roughed-in receptacle to