Safe isolation of rotary isolator when no incoming voltage present. Electrical Advice

Safe isolation of rotary isolator when no incoming voltage present. Discussion ThreadSafe isolation of rotary isolator when no incoming voltage present. Electrical Advice

Hi all, trying to work out the best way for proving safe isolation of a motor.

Motor is fed from a contactor inside control panel, it then passes through a local isolator and then to the motor, the isolator has auxillary contacts so that when it is in the off position the contactor will not pull in and supply power.

How can i prove that no voltage will flow through the isolator that is locked off when there is none incoming into it?

Thanks

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