Master Cutoff Switch

[FireSale]

Originally Posted by Pat McCue

I'll take a shot at answering the master cut off switch for electric vehicles question.. Jeff, team and I built the eCOPO as well as the orange car "Shock and Awe" that has run around division 6 for a few years.

All our cars, per General Rule 8.4, have master cut off switches. They are push off and clearly marked. When pushed they remove all low voltage power to the rest of the car (including to the low voltage components that connect the high voltage to the propulsion system).

We also have an "oh-sh#*" switch on the dash, that if ever needed (hasn't been needed in almost 175 electric runs) would remove 12v power to the master contactor in the hv motor system. That too is push off. That does not remove 12v power from the entire vehicle, just disconnects the HV.

Here's a picture of the back of the orange high school car.....
Pat

Thank you for the answer. In regards to the questions about EV cutoffs from others, the rule book has cutoff switch requirements. It must disconnect the motor and power pack. It's in the EV section buried up with ET Snowmobiles.