Journeyman Electrician’s Exam Journeyman Electrician's Branch Circuits 4

Question 1

What is the maximum allowable cord-and-plug connected load on a 15-ampere receptacle outlet?

Accepted Answer

12 amperes

Answer

NEC 210.21(B)(2) limits the load on a 15-ampere receptacle to 12 amperes (80% of rating) for cord-and-plug connected loads.

Question 2

A branch circuit supplying a 10 kW, 240-volt electric range in a dwelling unit must have conductors rated at least:

Accepted Answer

40 amperes

Answer

Per NEC Table 220.55 and 210.19, a 10 kW range requires a minimum 40-ampere circuit with 8 AWG copper conductors.

Question 3

Which type of branch circuit is permitted to supply fixed electric space heating equipment?

Accepted Answer

Individual or general-purpose branch circuit, per NEC

Answer

NEC 424.3 allows fixed electric space heating to be supplied by either an individual or general-purpose branch circuit.

Question 4

For a branch circuit supplying show window lighting in a commercial occupancy, the NEC requires a load calculation of at least:

Accepted Answer

180 VA per linear foot

Answer

NEC 220.14(G) requires show window lighting to be calculated at 180 VA per linear foot of show window.

Question 5

A 15-ampere, 125-volt duplex receptacle on a 20-ampere circuit is permissible when:

Accepted Answer

Two or more receptacles are on the circuit

Answer

NEC 210.21(B)(3) permits 15-ampere receptacles on a 20-ampere circuit when two or more receptacles are installed.

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