Final Competition Review Pt. 1

In a conventional hard-wired control system, the circuit logic is created during the   ?   phase.

• device manufacturing

• installation

• programming

• start-up

The principle difference between a contactor and a motor starter is   ?  .

• contactors are used only on lighting circuits

• the contactor does not contain overload relays

• the motor starter is physically larger

• the motor starter requires a limit switch for starting and stopping

The minimum size copper equipment grounding conductor required for a branch circuit protected by a 100-ampere fuse is a   ?   AWG.

• 4

• 6

• 8

• 10

Luminaires (fixtures) shall be constructed, installed, or equipped with shades or guards so that combustible material will not be subjected to temperatures in excess of   ?  .

• 60 C

• 75 C

• 90 C

• 105 C

A   ?   is a reactor used to restrict the current to AC or DC drives in the case of short circuits in the drive itself.

• capacitor

• silicon controlled rectifier

• choke

• triac

Class 1, Class 2, and Class 3 circuits shall be identified at terminal and junction locations in a manner that prevents   ?   interference with other circuits during testing and servicing.

• avoidable

• electromagnetic

• potential

• unintentional

Answer explanation

Article 725.30

The fixed wiring methods in assembly occupancies shall be metal raceways, flexible metal raceways, nonmetallic raceways encased in not less than   ?   of concrete, Type MI, MC, or AC cable.

• 2"

• 3"

• 4"

• 6"

Answer explanation

Article 518.4 (A)

In general, where a branch circuit supplies continuous loads or any combination of continuous and noncontinuous loads, the minimum branch-circuit conductor size, before the application of any adjustment or correction factors, shall have an allowable ampacity not less than the noncontinuous load plus   ?   of the continuous load.

• 70%

• 100%

• 125%

• 140%

Name three light activated devices used to receive light signals at the receiver.

• Light-emitting diode

• phototransistor

• photodiode

• PIN photodiode

For raceways containing conductors of 4 AWG or larger where splices or where angle or U pulls are made, the distance between each raceway entry inside the box and the opposite wall of the box shall not be less than   ?   times the trade size of the largest raceway in a row.

• 2

• 4

• 6

• 8

Answer explanation

Article 314.28 (A)(2)