This thread has wandered a good bit from the OP's question which was:
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Is it legal to have more than one power distribution board?
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In 2012, our vision tracking relied on a consistent light color and intensity. Whenever we shot and the motors had to work to spin up the shooter, or when we drove hard, the LEDs would dim and we lost tracking. So on Friday night, we dismantled an extra PD (removed the blue plastic case, and most of the WAGO connectors), then connected it as a load to the other PD, then used the boosted 12V power supply (normally used for the WiFi bridge) to supply the LEDs. That way, even when the voltage dropped, the LEDs remained at a constant brightness.
Since the PD was modified, and connected to a circuit breaker, it was considered a custom circuit, and therefore legal. (yes, we did get re-inspected).