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You can reduce induced voltage in control cable by applying the following methods.
1. While laying control cable keep a minimum distance 300mm from the power cable.
2. If possible try to lay control cable on the separate cable tray.
3. Earth the Armour/ screen of the control cable on both side of the cable or at-least at one side.
Some times it is not important to reduce the the induced voltage in control cable, but it's effect on relay or contactor as the contactor or relay does not pick-down even after the removal of the control supply. In that case it is recommended to use two relay/contactor in parallel and use the contacts in series or parallel for control circuit interlocking.
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