Power Supply for a Power House and Substation

In terms of safety 110 v AC is better the lesser voltage , less current to flow onyour body

But in terms of econmy, 220 volts is good because you will need smaller wires in transmission

so the choice is still yours , which one do you prefer?

110VAC is used widely for control panel internal power supplies in the UK.

Normally 110 V ac is preferred from the safety point of view

As has been said 110 volts ac is preferred for outside work, but it is usually supplied by an isolation transformer with a centre tap to Earth.

So the maximum voltage to touch is 55 volts to earth.

John.