6.6 Voltages
Voltage must not exceed 75V for direct current or 50V for alternating current except where prior approval
from the event organisers has been confirmed.

I am unclear on the number of cells permitted actually. Yes, it's 30 for NiCad, but the way it's worded implies that's only when in series. ie, could have more in parallel. And yes I know only series will increase voltage...