400 kV
11 kV
66 kV
132 kV
.
transformer substations (step up)
service mains
distributors
all of the above
feeder
distributor
service main
none of the above
its current carrying capacity
operating voltage
voltage drop in it
operating frequency
+/- 6%
+/- 8%
+/- 5%
+/- 10%