A SWER isolating transformer. The incoming supply in 22 kV, two phase, two wire, the outgoing supply is 12.7 kV line to earth on one wire.

A 230 -0-230 winding can also be included in the isolating transformer to enable supply to households close to the transformer.

One of the important considerations is the earthing of the transformer. Copper clad steel earth rods should be driven into the ground to make sure the isolating transformer is well earthed.

The transformer structure is built on two 12 metre poles with steel cross arms.