According to NEC Table 250.122, the minimum wire size for a single equipment grounding conductor (EGC) is 4 AWG (21.15 mm²) copper (Section 392.10 (B) (1) (c)).” In NEC (National Electrical Code) standards, the size of the ground wire conductor depends on various factors.
The rules for sizing wire-type equipment grounding conductors – copper, aluminum, or copper-clad aluminum – are: Use Table 250.122 to establish the minimum size – based on the ampere rating or setting of the automatic overcurrent device protecting the circuit ahead of the raceway or equipment.
Calculating the correct equipment grounding conductor size begins with identifying the rating of the overcurrent protective device. For example, if you are using a circuit breaker rated for 100 amps, you will consult NEC Table 250.122, which specifies that for a 100-amp device, the minimum conductor size would be No. 8 copper or No. 6 aluminum.
The Ground Conductor Size Calculator will calculate the proper ground conductor size for grounding raceways and equipment based on ampere rating or setting of automatic overcurrent protection device in circuit ahead of equipment. This is based on NEC NFPA 70E Table 250.122.
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Section 250.122 (A) General The rules for sizing wire-type equipment grounding conductors – copper, aluminum, or copper-clad aluminum – are: Use Table 250.122 to …
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Calculate grounding conductors per NEC guidelines for safe, compliant installations. Learn accurate sizing and best practices for effective electrical grounding.
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