All equipment grounding conductors in the gutter must be joined together.
NEC 2023 Basics: Sizing Equipment Grounding Conductors - Technical Articles
250 – Grounding and Bonding
Grounding and Bonding of Electrical Systems Help
Sizing equipment grounding conductors for voltage drop (and other increases). NEC section 250.122(B)
Equipment Grounding Conductor, PDF, Electrical Conductor
Sizing of Conductors Related to Grounding & Bonding – IAEI Magazine
Table 250.122.
Size the Minimum Required Equipment Grounding in Each Conduit for a 400A Feeder Gap on Vimeo
Table 250.102(C)(1). Grounded Conductor, Main Bonding Jumper, System Bonding Jumper, and Supply-Side Bonding Jumper for Alternating-Current Systems.
250 – Grounding and Bonding