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NEC Article 250 — Grounding and Bonding

Updated Mar 26, 2026
Grounding electrode system, equipment grounding conductors, bonding requirements for safety.

NEC Article 250: the most critical article for electrical safety. 250.4 general requirements: grounding limits voltage from lightning/surges, provides fault current path for overcurrent devices. 250.24 service grounding: grounding electrode conductor from service equipment to grounding electrode system. 250.50 grounding electrode system: use ALL electrodes present: metal water pipe (10ft contact with earth), metal building frame, concrete-encased electrode (Ufer ground: 20ft of 4 AWG or larger in concrete footing), ground rod (8ft, 5/8in). 250.52(A)(5) ground rod: min 25 ohms, if not, install second rod 6ft away. 250.66 grounding electrode conductor sizing per Table 250.66. 250.118 equipment grounding conductors: metallic raceway, equipment grounding conductor in cable, or separate EGC per Table 250.122. 250.119 identification: green, green with yellow stripe, or bare.

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NECgroundingbondingelectrodeUfer-groundEGCsafety
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code year
2023
code system
NEC
code section
Article 250
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