250.122(F) Size of Equipment Grounding Conductors. Conductors in Parallel.

All equipment grounding conductors in the gutter must be joined together.

16-113 (a) SIZING OF EQUIPMENT GROUNDING CONDUCTORS - 250.122 AND TABLE 250.122​​​​​​​

Practices for grounding and bonding of cable trays

15-9 FINDING THE SIZE EQUIPMENT GROUNDING CONDUCTOR - 250.122(B)

250.122(F) Size of Equipment Grounding Conductors. Conductors in Parallel.

Cable Tray Manual - Cooper Industries

Sizing Equipment Grounding Conductors (EGC) Table 250.122: What's New in the 2020 NEC?

Code questions

motor frame grounding conductor sizing - Electric motors & generators engineering - Eng-Tips

Equipment Grounding Conductors for Parallel Conductor Installations – IAEI Magazine