The circuits could then be transferred over one at a
time from the wooden temporary poles to the new steel
monopoles. This was not done with live lines due to the risk
of reducing the electrical clearances which would cause
a flash over and the need to make-off the conductors on
the new poles once the right sags had been achieved.
The power to the substation was not interrupted as one of
the lines was always energised and no power interruptions
were experienced.