Choice of PTC heater voltage to maximize user safety and ease of CE compliance to LVD

zork_14

Starting to get Involved
#1
Hi,

I'm selling a device similar to a 3D printer in its composition and it contains a PTC heater. My device must comply with the Machinery Directive, which in turn requires that the electrical part of my device must comply with the LVD.

For the heater, is it better to use

1. standard AC (110V/220V) with low inrush current ~1A
2. or low voltage DC (12V/24V/48V) with high inrush current ~ 5A?

In option 1. the user will handle a connector that carries standard AC (to plug the device to the control box). Maybe this does not matter as long as all cables and connectors have the correct rating for voltage/current? Is there something in the LVD advising against it?

Pros and cons below:

Standard AC
- Good: no need for additional power supply
- Bad?: AC cable handled by user.

Low voltage DC
- Bad: need for additional power supply
- Bad?: higher inrush current
- Good?: the user will handle a connector that carries low voltage

If I choose low voltage, I have the choice between 12V, 24V, 48V. Is the safety advantage of using low voltage still good with 48V?

Below is a rough schematic of the two options.
Thanks for any hint

1622319615236.png
 
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