Rule 53
In Relation To Installation Of The Lines Of Different Voltages In A Single Pole
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(1) While installing electric lines of different voltages on a single  pole, the line of higher voltages shall be installed above and the line of low  voltage below.
(2) While installing lines in a manner as mentioned in sub-rule (l),  care has to be taken that no leakage or danger of any kind or charge shall  exist from high voltage line to low voltage line.
(3) It is necessary that a distance required from the technical point   of view should be maintained between the lines of high voltage and low  voltage.