Can low-voltage and high-voltage circuits be connected to the same cable tray
Complete separation is typically required, meaning low-voltage cables must not share the same raceway, cable tray, or enclosure as line voltage conductors. It doesn't sound like you're in the US, but here in US, this is acceptable provided all of the insulation is rated for the highest voltage in the tray. Mixing high and low voltage circuits seems like a recipe for disaster, and frankly, you're not entirely wrong to be concerned. The short answer is generally no, you shouldn't be mixing them in the same junction box without proper precautions.
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