NEC 250.90-250.102 Explained: Bonding on the Line & Load Side
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.
NEC 250.122 Explained: Sizing the Equipment Grounding Conductor
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.
Ground Ring Electrode Explained: NEC 250.52(A)(4)
A ground ring is 20 ft of 2 AWG bare copper encircling the building, buried 30 in. deep. NEC 250.52(A)(4) and 250.53(F) requirements, GEC sizing and field traps.
High-Resistance Grounding Explained: How It Works & Where It’s Used
High resistance grounding limits ground-fault current to 5-10 amps so a first fault alarms instead of tripping. How the NGR is sized, and what NEC 250.36 requires.
Ufer Ground (Concrete-Encased Electrode) Explained: NEC 250.52(A)(3)
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.
Bare Copper Ground Wire: NEC Sizing & Code Rules Explained
Complete NEC guide to bare copper ground wire: EGC sizing from Table 250.122, the 250.122(B) upsizing rule, GEC rules under 250.64, and where bare copper is required.
Intersystem Bonding Termination: What It Is & NEC Requirements
Complete guide to intersystem bonding terminations (IBT) under NEC 250.94 — the six IBT conditions, other means option, where to install, which systems require bonding, and 2023 changes.
Grounding vs Bonding Bushings: When the NEC Requires Each
Bonding bushing vs grounding bushing: when NEC 250.92 and 250.97 require one, the 250 V-to-ground rule, and how to size the bonding jumper on the bushing.
Bonding Jumper: Types, Sizing & NEC Rules (MBJ, SBJ, EBJ)
A bonding jumper ties neutral, ground and enclosures together. Size the main bonding jumper from NEC Table 250.102(C)(1): chart, 12.5% rule, worked examples.
Grounding a Conductor Explained: What Grounding Means in Electrical Systems
If you are learning electrical theory or preparing for the journeyman exam, the phrase grounding a conductor can be confusing at first.
That is because...
NEC Article 250: Grounding and Bonding Rules Explained
NEC Article 250 in one page: grounding vs bonding, the 10 parts of the article, and the key sections electricians use most (250.50, 250.66, 250.122).
Grounding Electrode: What It Is, NEC 250.52 Types and Rules
A grounding electrode is the metal object that connects an electrical system to earth. All 8 NEC 250.52(A) electrode types, key sizes, and GEC vs electrode.
