[dtengineering]

Good question. The relevant rule appears to be:

R38 The ROBOT battery, the main 120-amp (120A) circuit breaker (Cooper Bussman P/N: CB185-120), and the Power Distribution (PD) Board shall be connected as shown in Figure 4-7.

Figure 4-7 indicates: 6 AWG Wire (min.)

It is somewhat vague whether the minimum refers to the "6 AWG Wire" statement, in which case something with greater current handling capacity than 6AWG wire would be allowed, or whether the minimum refers to the 6 AWG, in which case only larger wire would be allowed.

Personally, were I doing the inspection, and without further guidance, I would interpret this to mean the bus bar (assuming it has a greater current carrying capacity than a 6AWG wire) would be legal. Another inspector could rule differently, however, and I can't say they'd be wrong. They could cite R48 All active circuits shall be wired with appropriately sized insulated wire: Personally, I read that as referring to branch circuits after the PD board, because the resulting table only goes up to 40A, however I totally see how someone else could read it differently, or use it as guidance that the GDC intended for wires to be the only way to conduct electricity.

There is also R50 to keep in mind: R50 All active circuit wiring with a constant polarity (i.e., except for outputs of relay modules, motor controllers, or sensor outputs) shall be color-coded as follows: so even if the bus bar were legal, it would have to be appropriately colour coded.

My suggestion would be to either ask the question on the Q&A forum, or prepare a length of 6AWG wire with appropriate terminal ends and bring it with you to the competition. That way, if the inspector does request a change, you undo two nuts and replace the bus bar with the wire.

Good question... but in lieu of a Q&A, I don't think there is a definitive answer.

Jason