Equipment Grounding Conductor Sizing (Table 250.122)
4:46
The equipment grounding conductor isn't sized from the load or the wire ampacity — it's sized from the breaker. Table 250.122 is one of the most tested tables on the exam, and the proportional increase rule trips up even experienced electricians.
In this lesson: the core sizing rule, Table 250.122 key values, the classic "sizing off conductor ampacity" trap, the 250.122(B) proportional increase rule with two full worked examples, the flexible cord exception, the 14 AWG copper absolute minimum, shared EGCs in multi-circuit raceways, why parallel raceways each need their own full-size EGC, copper vs aluminum sizing, motor circuits, and EGC color identification.
