For those who want to know heres a list of the voltages and the machines that accept them.
EV
NONE!
HV
Mass Fab
Teraformer
MV
Induction furnace (noticed no difference in speed)
LV
Everything else
Note some machines will not explode when first connected to the wires because they do not need energy. Once you try to operate them or remove and replace the cable it will blow.
and also EV into a mass fab is a NUKE size boom.