Low Current Electricity

Homework?

Hire a competent electrical engineer. Is that simple enough?

We normally provide it from the substation in the undergound floor. What else you want to know more?

I think you may mean low voltage, rather than low current. In some locales, for power distribution purposes, anything below 1000 volts is considered "low voltage." The usual scheme is is for a medium voltage supply to feed a transformer (mounted on a pad or platform outside the facility), which in turn supplies a locally standard low voltage (575, 480, 415, 380, etc.) to the facility's switchgear. This is not etched in stone; there are also medium-voltage plants such as 4150, to pick one example.