Can PV array equipment grounding conductors and grounding electrode conductors not larger than 10 AWG be solid when installed in raceways?

The grounding conductors for photovoltaic (PV) array equipment can indeed be solid when they are installed in raceways, provided they do not exceed a size of 10 AWG. This allows for a more straightforward installation process and adheres to the National Electrical Code (NEC) guidelines in certain situations. Solid conductors can provide sufficient grounding and bonding while being easier to manage in raceway applications compared to stranded conductors, which can introduce challenges in fitting and securing the wiring properly.

The code allows this practice for grounding systems primarily because of solid conductors' reliability in grounding applications when properly installed. Additionally, since these conductors are being protected within a raceway, the risk of physical damage is reduced, which further supports the use of solid conductors in this specific context.