230V control circuit

We've just taken delivery of a control panel that has switches controlling power to two pumps, a 9kW tank heater and an over-temperature trip. The control voltage is all 230V. Our maintenance engineer says that the control voltage, according to EIC 60204, should be stepped down to 24V. Is this mandatory? The panel is fully enclosed with an interlock cutting power when it's opened. There are no complex plc's involved, all very simple controls.

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  • But the panel has 2 start/stop buttons for pump motors, an activation switch for a temperature controller, and an overtemperature interlock. Doesn't this preclude that exception? 

    We don't know what the manufacturer classifies as control circuits. 

    Because of the Supply of Machinery (Safety) Regulations and Section 6 of H&S@W etc. Act, I would be inclined to discuss any queries about conformity with the supplier and manufacturer in the first instance.

    But ... it is the right thing to do: check if things are not clear. In this case, it is very important for safety during maintenance.

  • Thanks.

    Sadly the the supplier is less than happy we're questioning their work. But yes, safety is priority.

  • Sadly the the supplier is less than happy we're questioning their work.

    Understandable, but since this is a safety-related question according to Section 6(1) of the H&S@W etc. Act, I'm sure they would be more than happy to cooperate.

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