Wire gauge chart cover showing 8, 4, 1/0 and 4/0 AWG copper conductors drawn to scale, NEC Table 310.16

Wire Gauge (AWG) Chart for Electricians: Ampacity and Size

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Wire gauge chart for copper and aluminum, 14 AWG to 500 kcmil: ampacity from NEC Table 310.16, diameter and resistance from Chapter 9 Table 8, and wire size by breaker.
NEC 250.90 to 250.102 bonding diagram showing a service enclosure with a bonding bushing and supply-side bonding jumper to the bonding bar

NEC 250.90-250.102 Explained: Bonding on the Line & Load Side

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NEC 250.90 through 250.102 explained section by section: the four bonding jumpers, Table 250.102(C)(1) vs Table 250.122, and when a locknut is not a bond.
100 amp sub panel wire size: 3 AWG copper, 1 AWG aluminum, 8 AWG copper ground, four-wire feeder per NEC 215.2 and Table 310.16

100-Amp Sub-Panel Wire Size: NEC Feeder & Ground Sizing

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A 100 amp sub panel needs 3 AWG copper or 1 AWG aluminum, a full-size neutral and an 8 AWG copper ground. NEC 215.2, Table 310.16 and 250.122 explained.
Voltage drop formula VD equals 2 times K times I times L divided by CM, with NEC 3 percent branch and 5 percent total limits and K values for copper and aluminium

How to Calculate Voltage Drop: NEC Formula + Worked Examples

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The voltage drop formula explained: VD = 2KIL/CM for single-phase, 1.732 for three-phase. Worked NEC examples, max run charts, and where 3% is mandatory.
PVC conduit fill chart showing NEC Chapter 9 Table 1 limits of 53 percent, 31 percent and 40 percent with a conduit cross-section holding seven conductors

PVC Conduit Fill Chart: NEC Chapter 9 Limits for Schedule 40 & 80

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PVC conduit fill chart for Schedule 40 and Schedule 80 with THHN. NEC Chapter 9 Table 1 percentages, Annex C counts, and the calculation for mixed wire sizes.
NEC 250.122 equipment grounding conductor sizing, showing a raceway cross-section with the green EGC that Table 250.122 sizes

NEC 250.122 Explained: Sizing the Equipment Grounding Conductor

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NEC 250.122 sizes the equipment grounding conductor from the breaker, not the load. Table 250.122 sizes, the 250.122(B) upsize rule, and the parallel trap.
8 AWG wire ampacity chart showing 40 amps at 60C, 50 amps at 75C and 55 amps at 90C from NEC Table 310.16

8 AWG Wire Ampacity: 40 A or 50 A? NEC 310.16 Explained

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8 AWG ampacity is 40 A, 50 A or 55 A depending on which column of NEC Table 310.16 you are allowed to read. Here is how to pick the right one, with the 8 THHN and NM cable rules.
Liquidtight flexible conduit cross-section showing PVC jacket and interlocked metal core, comparing LFMC under NEC Article 350 with LFNC under Article 356

Liquid Tight vs Sealtite: LFMC vs LFNC Conduit Explained

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Liquid tight vs sealtite explained: Sealtite is a brand, LFMC and LFNC are the two NEC wiring methods. Article 350 vs 356, fill, length limits and grounding.
Minimum circuit ampacity MCA explained with an HVAC nameplate showing RLA, MCA and maximum breaker rating under NEC Article 440

Minimum Circuit Ampacity (MCA) Explained for Electricians

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Minimum circuit ampacity sizes your conductors, not your breaker. The NEC 440.32 and 440.33 formulas, MCA vs MOCP, and how to pick a wire from a nameplate MCA.
Ufer ground diagram showing rebar encased in a concrete footing in direct contact with earth per NEC 250.52(A)(3)

Ufer Ground (Concrete-Encased Electrode) Explained: NEC 250.52(A)(3)

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Ufer ground explained: what NEC 250.52(A)(3) requires of a concrete-encased electrode, rebar vs 4 AWG copper, GEC sizing, and what disqualifies a footing.

NEC Code Book Editions: 2017 vs 2020 vs 2023 vs 2026 Differences

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The NEC is updated every 3 years: 2017, 2020, 2023, 2026 (next: 2029). Key changes in each edition, which states use which, and which to study for your exam.

Proper Sizing of Conduits and Raceways. NEC Annex C.

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NFPA 731 Section 4.6.3.12(2) clearly states that whenever raceways, conduits, or tubing are used (even for security systems), they must be sized in accordance...
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