Free practice · NEC 2026

Five Texas journeyman practice questions

Answer each question before opening the explanation. Keep your 2026 code book beside you and time every lookup.

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Question 1 of 5

For a dwelling feeder or service calculation, what general lighting unit load applies before demand factors?

  1. 1 VA per square foot
  2. 2 VA per square foot
  3. 3 VA per square foot
  4. 4 VA per square foot
Show answer and explanation

B. 2 VA per square foot. Section 120.41 uses 2 VA/ft² for the feeder or service calculation. The branch-circuit calculation in 120.13 uses 3 VA/ft², so first identify which calculation the question asks for.

Reference: NEC 2026 120.41; compare 120.13.

Question 2 of 5

With no 100%-rated assembly exception, what is the minimum feeder conductor sizing rule?

  1. 100% of the total load
  2. 125% of the total load
  3. 100% of noncontinuous load plus 125% of continuous load
  4. 80% of the continuous load
Show answer and explanation

C. 100% of noncontinuous load plus 125% of continuous load. Separate the two load types before applying the rule. Adding every load together first and multiplying the entire result by 125% produces the wrong answer.

Reference: NEC 2026 215.4(A)(1) and 215.5.

Question 3 of 5

In a box-fill calculation, how much volume is assigned to each 12 AWG conductor?

  1. 2.00 cubic inches
  2. 2.25 cubic inches
  3. 2.50 cubic inches
  4. 3.00 cubic inches
Show answer and explanation

B. 2.25 cubic inches. Use the conductor volume listed for 12 AWG, then apply the counting rules for conductors, clamps, fittings and equipment grounding conductors in the box.

Reference: NEC 2026 Table 314.16(B)(4).

Question 4 of 5

What full-load current does Table 430.250 list for a 10 hp, three-phase, 230 V motor?

  1. 24 A
  2. 28 A
  3. 32 A
  4. 42 A
Show answer and explanation

B. 28 A. Use the table current for ordinary conductor and short-circuit protection calculations. Motor overload protection instead uses nameplate current under 430.6(A)(2).

Reference: NEC 2026 Table 430.250 and 430.6(A)(2).

Question 5 of 5

Four eligible fastened-in-place dwelling appliances, each rated at least 500 W, share one feeder. What demand factor may apply to their combined load?

  1. 100%
  2. 80%
  3. 75%
  4. 70%
Show answer and explanation

C. 75%. Section 120.53 excludes cooking equipment, dryers, space heating, air conditioning and electric vehicle supply equipment. Confirm that every appliance fits the rule before using the factor.

Reference: NEC 2026 120.53.

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