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One real exam-style question at a time — with the exact NEC article or table where the answer lives. Five new questions every week.
Practice question · NEC Table 250.122
What Size Equipment Grounding Conductor for a 150 Amp Circuit?
150 amps falls between rows — go up to the 200-amp row: 6 AWG copper.
Practice question · NEC Table 300.5
How Deep Do You Bury a GFCI-Protected Residential Branch Circuit?
The GFCI residential column is the shortcut — 12 inches, not the general 24.
Practice question · NEC 430.52
How High Can a Motor Breaker Go When It Won't Start?
250% won't start it? Exception 2 raises the ceiling to 400% of FLC.
Practice question · NEC Table 250.66
What Size Grounding Electrode Conductor for 4/0 Copper?
Over 3/0 through 350 kcmil = 2 AWG copper GEC. The GEC follows the service conductors.
Practice question · NEC Table 300.19(A)
How Often Do You Support Conductors in a Vertical Raceway?
18 AWG through 8 AWG = support at least every 100 feet.
Practice question · NEC Table 430.52
What Size Breaker for a 22A Motor?
22 × 2.5 is 55A, not a standard rating — the next higher standard breaker is 60A.
Practice question · NEC Table 210.21(B)(2)
What Is the Max Load on a 15-Amp Receptacle Circuit?
15-amp circuit = 12 amps maximum load — receptacles get the 80% rule too.
Practice question · NEC 314.16(B)(4)
How Many Box Fill Allowances for a Duplex Receptacle?
A device yoke counts as 2 allowances — 4.5 in³ for 12 AWG.
Practice question · NEC 430.22
What Is the Branch-Circuit Ampacity for a 3 HP Motor?
17A from Table 430.248 × 1.25 = 21.25A minimum conductor ampacity.
Practice question · NEC 250.104(B)
What Size Bonding Conductor for Metal Gas Piping?
Sized per Table 250.122 — gas pipe bonds like a circuit, not a service.
Practice question · NEC Table 250.66
What Size Grounding Electrode Conductor for 500 kcmil Copper?
500 kcmil copper service → 1/0 AWG copper GEC. The GEC follows the service conductors.
Practice question · NEC 250.104(C)
What Table Sizes a Bonding Jumper for Structural Steel?
Match the noun "bonding jumper" — the steel bonds like a service, off Table 250.102(C)(1).
Practice question · NEC 430.52
What Size Fuse for a 22A Motor at 300%?
22 × 3 is 66A — not a standard size. The round-up rule takes you to 70A.
Practice question · NEC Table 430.7(B)
What Is the Locked-Rotor kVA of a 10 HP Motor?
Code G tops out at 6.29 kVA per HP — "maximum" means the top of the range.
Practice question · NEC Table 220.42
What Is the Demand Load for 40,000 VA of Office Lighting?
3,000 VA at 100%, the rest at 35% — don't skip the first row of the table.
Practice question · NEC Table 300.5
How Deep Do You Bury UF Cable?
Direct-buried UF cable needs 24 inches of cover — and the one word in the stem that changes the answer.
Practice question · NEC Table 220.55
What Is the Demand Load of a 12 kW Electric Range?
Nameplate says 12 kW. The Code says 8. Here’s the table that decides.
Practice question · NEC 430.52
What Does a Motor Branch-Circuit Breaker Actually Protect Against?
Short-circuit and ground-fault — but never overload. That’s a separate device.
Practice question · NEC 250.104(A)
What Size Bonding Jumper for Metal Water Pipe?
Three tables, three jobs: match the noun “bonding jumper” to 250.102(C)(1).
Practice question · NEC 820.100
Does Coax Cable Need to Be Grounded?
Yes — the shield bonds to the grounding electrode system per 820.100.
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