LV on panel door-mounted equipment

I think you are really asking if a 230v pilot lamp is OK on a hinged metal panel on a unit with mains inside

The short answer is yes, mains powered lamps meters, sockets  etc can all be mounted on the moving parts  of a metal box.

The longer answer says that there are other factors to consider in adding a 230 to say 24V supply, if one is not already there, and there is the risk of an ELV  supply failure giving a false safe indication if the 24V or whatever should fail, and the equipment otherwise remains energised. The various failure  modes need to be considered, this  may not matter in this case - how are the indicators used ?

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Historically to avoid filament lamps (unreliable especially in a high vibration setting like a factory), we would have used mains operated neons, maybe in pairs for redundancy if a lights out was meant to indicate safety.


If you go to  ELV, the wiring to and the ELV device itself  still sharing an enclosure with the mains, so still needs to be installed and  insulated as if it might come live..

Other factors, not voltage related

How is wiring being handled at the hinges - for thin wires it is nice to run the wire to the hinge and then a few inches in a direction  more  or less in-line with the hinge pins, so the action on the wire is more of a twist than a flex. If this cannot be done, then strain loops need to be considered..


If the concern is that the door mounted kit may become  damaged or wet and then expose a dangerous voltage, then really it is not suitable (or its guard, or Bezel or and lens is not suitable) for the location, regardless of LV or ELV.


regards Mike.

Many years ago I used to build control panels and we used transformer lamps on panel doors to ensure that the 240 was contained within the cabinet and any bulbs were  only 24v to prevent the danger of live exposure if a lens / bulb was damaged.