Battery Disconnect Wiring - Road Course and Drag Racing Compliant

[AU Doc]

As much as I would like to build my car to spend all its days on a road course, the reality for me is there are several drag strips that are a lot more convenient. That, and most of my friends like drag racing. So, I'd putting my car together for road course and autoX, but I'm trying to make sure I don't do anything that would prevent me from going to the drag strip when I get the chance.

As I understand the rules, the road course sanctioning bodies want a battery disconnect within reach of the driver, but NHRA wants the disconnect outside the car in the rear for trunk mounted batteries. If that's the case, it looks like I will need to run two #8 wires to the trunk along with my 1/0 for the starter. I've got two options in mind:

Here's the first option where I would need a heavy duty switch for the main cable from the battery. Mounting the "NHRA Disconnect" will be tough because my battery is above my axle, and I want to limit the length of unprotected cable that is always energized. I think the switch in the driver's compartment can be lighter duty as it will only need to carry the operational current of the car, but not the starting current.



This next option I think is my preferred approach because it will be easier to route a fused #8 around in my trunk to a convenient place for my disconnect to mount. As far as I can tell, both options kill the power to the car. Will this satisfy both sanctioning bodies?



Does anyone have, or have you seen, any other clever options that would let me run just one #8 to the trunk? Could I use a relay to switch a disconnect in the engine compartment, or is that not allowed?