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Not in our regulations. 50VAC RMS is the safe touch voltage.
110V CTE supply is over 50VAC, so it must be and is treated as any other LV supply.
Maybe that's why it's 55V and not 50V to earth. It's wired and treated as LV yet in reality, it's as safe as ELV. What a great system.
There is no way you can argue that 230V to earth is as safe as 55V to earth just because you have an RCD in the supply, bearing in mind that RCD's do NOT prevent you from getting an electric shock.
You WILL feel it, but it won't kill you.