Journeyman Electrician’s Exam Journeyman Electrician's General 5

Question 1

What is the minimum headroom required in front of electrical equipment rated 1,200 amps or more and over 6 feet wide that contains overcurrent devices?

Accepted Answer

7 feet

Answer

NEC 110.26(E)(1)(b) requires a minimum headroom of 7 feet for service equipment, switchboards, or panelboards rated 1,200 amps or more.

Question 2

When conductors of different systems (e.g., 120V and 277V) occupy the same raceway, what is required?

Accepted Answer

All conductors must be insulated for the maximum voltage present

Answer

NEC 300.3(C)(1) permits conductors of different systems in the same raceway if all conductors are insulated for the maximum voltage of any conductor in the raceway.

Question 3

What is the maximum allowable percentage fill for three conductors in a rigid PVC conduit (Schedule 40)?

Accepted Answer

31%

Answer

NEC Annex C and Chapter 9, Table 1 specify a maximum conduit fill of 40% for two conductors and 31% for three or more conductors in any raceway.

Question 4

A 30-amp, 120V single-phase branch circuit requires which minimum wire gauge for copper conductors?

Accepted Answer

10 AWG

Answer

NEC 240.4(D) and Table 310.12 require a minimum 10 AWG copper conductor for a 30-amp branch circuit.

Question 5

Which wiring method is specifically designed for use in hazardous (classified) locations and provides both physical and gas-tight protection?

Accepted Answer

Rigid Metal Conduit (RMC) with threaded fittings

Answer

Rigid Metal Conduit (RMC) with threaded, gas-tight fittings is the standard wiring method used in Class I, Division 1 hazardous locations to prevent ignition of flammable gases.

Journeyman Electrician’s Exam Practice Test

Journeyman Electrician’s Exam Practice Test

Journeyman Electrician’s Exam Journeyman Electrician's General 5