Four Gauge wire can be used for main power between your batteries, main breaker and power distribution on your FRC Robots. The thinner 6 gauge wire has been common for some time in competition robotics wiring, however, with this larger 4 gauge wire you can prolong breaker life thanks to lower resistance, larger, and more flexible wire.
6 Gauge Robot Power Cable Kit - AndyMark, Inc
Basic Pneumatic Robot Kit - RobotShop
LAUSD Vendors - As of 8-6-21 For RXs, PDF, California
4 AWG THHW Multi-Purpose Flexible Wire Black
4 Gauge Robot Side Power Cable Kit - AndyMark, Inc
4 Gauge 4 AWG 10 Feet Black + 10 Feet Red Welding
2011 Logomotion Game Rules/Manual - FIRST Robotics Canada
AndyMark Studica Canada - Robotics, Automation Technology for Education and Industry
WindyNation's Power-Flex welding and battery cable is a highly flexible industrial-grade electrical cable. A high strand cable count combined with a
4 Gauge Pure Copper Ultra Flexible Welding & Battery Cable