Journeyman Electrician's General Flashcards
7 cards from real Journeyman Electrician’s Exam practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Journeyman Electrician's General flashcards as text
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?
Answer: 7 feet
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.
When conductors of different systems (e.g., 120V and 277V) occupy the same raceway, what is required?
Answer: All conductors must be insulated for the maximum voltage present
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.
What is the maximum allowable percentage fill for three conductors in a rigid PVC conduit (Schedule 40)?
Answer: 31%
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.
A 30-amp, 120V single-phase branch circuit requires which minimum wire gauge for copper conductors?
Answer: 10 AWG
NEC 240.4(D) and Table 310.12 require a minimum 10 AWG copper conductor for a 30-amp branch circuit.
Which wiring method is specifically designed for use in hazardous (classified) locations and provides both physical and gas-tight protection?
Answer: Rigid Metal Conduit (RMC) with threaded fittings
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.
What is the purpose of a 'bonding jumper' in an electrical system?
Answer: To ensure electrical continuity and conductivity of the grounding path across metal parts
A bonding jumper ensures electrical continuity and adequate conductivity to conduct safely any fault current likely to be imposed on metal parts of a system.
For a 200-amp service to a single-family dwelling, what is the minimum size copper grounding electrode conductor (GEC) required when using a concrete-encased electrode?
Answer: 6 AWG
NEC 250.66(B) permits the GEC to a concrete-encased electrode to be no smaller than 4 AWG copper, but Table 250.66 sets 6 AWG as the minimum for a 200A service — and 250.66(B) allows using just 4 AWG to the Ufer regardless of service size.