24VDC vs 12VDC for PLC Controls

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I am quoting a water park Install which has PLC controlled Items (i.e. Water Cannons) and I am having trouble with a Local Health Inspector who wants all of my control lines for the Pushbuttons and Solenoid valves to be 12VDC instead of 24VDC because of the shock hazard.
Is there any real difference between the 2 Voltages except for 12V.
If I run 24VDC the current required to close the solenoids will be lower then if I go with 12VDC and I think that would be more important.

Is there a Code Requirement which limits the voltage amplitutde in these situations? If there isn't how can I convince the Inspector 24V is better.

Leslie
 
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