So EV4.7 details the High Voltage Disconnect:

EV4.7 HV Disconnect (HVD)
EV4.7.1 It must be possible to disconnect at least one pole of the tractive system accumulator by quickly removing an unobstructed and directly accessible element, fuse or connector, in case of (a) stuck accumulator isolation relay(s) for example. It must be possible to disconnect the HVD without removing any bodywork. The HVD must be above 350mm from the ground and easily visible when standing behind the vehicle. Remote actuation of the HVD through a long handle, rope or wire is not acceptable.

EV4.7.2 An untrained person must be able to remove the HVD within 10 seconds in ready-to-race condition. This will be tested during Electrical Tech Inspection. Being able to quickly disconnect the accumulator(s) from the rest of the tractive system by its connector(s) will satisfy this rule.

EV4.7.3 EV4.5 remains valid, therefore a dummy connector or similar may be needed to restore the system's isolation.

EV4.7.4 The HV Disconnect must be clearly marked with "HVD".

EV4.7.5 No tools must be needed to open the HVD. Therefore, an interlock must activate the shutdown circuit and open the AIRs when the HVD is removed.

Disconnecting high voltage DC without an arc quencher (is that the right word? It's escaping me) is extremely dangerous. Something like a simple fuse/connector with 250 amps through it and 300 volts could maim or kill someone when they pull it. This rule would be way safer if teams were required to have a lockout/tagout or something on it to stop people from pulling the HVD while the battery is under load, but that's explicitly disallowed.

This is what happens when you disconnect a 220 volt, 12 amp circuit: https://youtu.be/Zez2r1RPpWY

Do they just expect us to only disconnect it under zero load? If it's under zero load, why can't we use tools / a key?