EETC Conduit & Raceway Systems 3

Question 1

When conduit penetrates a fire-rated wall or floor assembly, the NEC and building codes require:

Accepted Answer

An approved firestop system or fire-rated sealant to restore the fire rating

Answer

A reducing bushing on each side of the penetration

Answer

A junction box installed on both sides of the wall

Answer

A disconnecting means within 5 feet of the penetration

Question 2

The NEC requires conduit ends to be reamed or otherwise finished after cutting in order to:

Accepted Answer

Remove sharp edges that could damage conductor insulation during pulling

Answer

Increase the internal diameter to allow larger conductors

Answer

Improve the mechanical connection at fittings

Answer

Allow for thermal expansion of the conduit

Question 3

When PVC conduit is installed in a location subject to physical damage, the NEC requires using:

Accepted Answer

Schedule 80 PVC, which has a thicker wall for greater impact resistance

Answer

Schedule 40 PVC with a protective paint coating

Answer

A steel sleeve installed around the PVC for the entire exposed length

Answer

Double-wall PVC conduit listed for physical damage protection

Question 4

A wireway differs from conduit in that it:

Accepted Answer

Features a hinged or removable cover that provides access to conductors at any point

Answer

Must be installed underground only

Answer

Cannot contain splices or taps

Answer

Is limited to circuits of 120 volts or less

Question 5

Flexible Metal Conduit (FMC) may serve as the equipment grounding conductor (EGC) without a separate ground wire only when:

Accepted Answer

The circuit is protected at 20 amperes or less and the FMC length does not exceed 6 feet

Answer

The circuit is protected at 60 amperes or less and any length is used

Answer

A bonding jumper is run externally along the outside of the FMC

Answer

The FMC has a listed grounding fitting at each end

Question 6

Cable tray systems installed in industrial facilities may contain:

Accepted Answer

Power and communication cables provided they are separated in accordance with NEC Article 392

Answer

Only type NM cable in dry locations

Answer

Conductors only if they are enclosed in conduit within the tray

Answer

High-voltage conductors exclusively above 600 volts

Question 7

When conduit is installed in a straight, horizontal run, the NEC requires expansion fittings to be used when:

Accepted Answer

The conduit crosses a building expansion joint or when thermal expansion may cause excessive stress

Answer

The conduit exceeds 100 feet in length regardless of material

Answer

More than two 90° bends are present in the run

Answer

The conduit is exposed to direct sunlight for more than 4 hours per day