PV Equipment Grounding Conductor (NEC 690.45)
The PV-specific equipment grounding conductor per NEC 690.45: sized from the OCPD via Table 250.122, or from the PV short-circuit current where a source circuit has no overcurrent device, never smaller than 14 AWG. 690.45 waives the 250.122(B) rule, so enlarging the conductors for voltage drop does not enlarge the EGC -- the over-build the general rules cause.
Formula and source
basis = OCPD rating > 0 ? OCPD : PV Isc; EGC = Table 250.122 size for the basis, never smaller than 14 AWG; the 250.122(B) proportional upsize does not apply (690.45).
The NEC 2023 690.45 equipment grounding conductors for PV systems, with Table 250.122, by name.
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