Code, Standards, and Practices 2, Level II - 2020 Lesson 5

Listed metal outlet boxes are not permitted to be used with ENT.

False

ENT is permitted to be used in all plenum applications.

False

For the purpose of determining the number of floors in a building pertaining to ENT, the first floor of a building shall be the floor which has 80% or more of the exterior wall surface area level with or above finished grade.

False

Stubbing down requires making a void on top of the form prior to pouring concrete so that the ENT system can be extended above the slab ceiling.

False

A pliable Type ENT raceway is a raceway that can be bent by hand, without the use of any tools.

True

ENT can be used in residential applications, commercial applications, schools, condominiums, apartments, and industrial applications.

True

ENT is permitted to be installed exposed in buildings not exceeding three floors where not prohibited by Section 362.12.

True

ENT is permitted to be used for branch lighting and power circuits above a suspended ceiling, including a lay-in ceiling, as long as this area is not used as an air-handling space.

True

For cables that have elliptical cross-sections, the cross-sectional area calculation for wire fill shall be based upon the major diameter of the ellipse as a circle diameter.

True

Gypsum wallboard 1/2 inch thick maintains a finish rating of 15 minutes.

True

It is common to use ENT with listed floor boxes when encased in concrete.

True

Listed rigid nonmetallic conduit (PVC) fittings, such as couplings and male terminal adapters, can be solvent-cemented onto ENT as long as the solvent cement being used is approved for use with ENT.

True

Smurf tube is another name used by contractors and inspectors for ENT.

True

The NEC permits the use of ENT to be installed beneath a raised floor when used for information technology equipment.

True

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.

True

The statement "not subject to physical damage" means the normal activity in the area where the installation is located is such that it would not damage the installation.

True

When installing ENT through a fire-resistive floor, all openings around the ENT shall be firestopped using approved methods to maintain the fire resistance rating

True

Electrical nonmetallic tubing is defined in the NEC as a nonmetallic, pliable, corrugated raceway of circular cross-section with integral or associated couplings, connectors, and fittings for the installation of electrical conductors. ENT is composed of a material that is resistant to moisture and chemical atmospheres and is flame retardant.

a. True NEC Ref: 362.2

ENT is permitted to be used in assembly occupancies when encased in not less than ? of concrete.

b. 2" REF: 518.4(A)

ENT shall be securely fastened at intervals not exceeding ? . In addition, ENT shall be securely fastened in place within ? of each outlet box, device box, junction box, cabinet, or fitting where it terminates.

b. 3' / 3' REF: 362.30(A)

How many 90° bends in a length of ENT are permitted between the panel and a box?

b. 4 REF: 362.26

In both exposed and concealed locations where ENT is installed through bored holes in joists, rafters, or wood members, holes shall be bored so that the edge of the hole is not less than ? from the nearest edge of the wood member. Where this distance cannot be maintained, the cable or raceway shall be protected from penetration by screws or nails by a steel plate or bushing, at least 1.6 millimeters (1/16 inch) thick, and of appropriate length and width installed to cover the area of the wiring.

d. 1 1/4"

ENT is not permitted to be used in which of the following applications?

d. All of the above

ENT that is likely to be penetrated by nails or screws in metal framing members shall generally be protected by a(n) ? .

d. any of the above Ref: 300.4(B)(2)

ENT is permitted to be used in which of the following applications?

e. All of the above

Which statement(s) are true regarding the performance of ENT during a fire?

e. All of the above

Where can ENT be used exposed?

e. a., b., and c.

ENT is permitted to be installed in buildings exceeding three floors ? .

e. both a. and b.

ENT ceiling boxes listed for fixture support are permitted to support a luminaire weighing a maximum of ? .

e. both b. and c.