[BC] 110 V DC

[PeterH5322]

>600V is the top limit on "low voltage" distribution because it's about
>the highest voltage that can be safely switched with air-break
>switches and breakers.  Above that you have to go to much more
>expensive oil-break stuff.

In the U.S. we have "300 volt class" (no more than 300 volts 
line-to-ground) and "600 volt class" (no more than 600 volts 
line-to-ground).

Above 600 volts, it is largely the electric utility which defines the 
distribution voltage.

At the electric utility where I was an EE some years back, our above-600 
volt options were 4,800 volts and 34,500 volts, with 4,160 volts as an 
option provided that the customer provided a vault and a transformer to 
convert our 4,800 or 34,500 to his requested 4,160.