At the risk of being crucified again on here, I know this is mostly a D.C. forum. Unfortunately I don't have good access to D.C. lights, outside of pixels. Most of my lights are 110V, but my supply is 240V. However, I can get access to a 240V to 55V-0-55V center tapped earth transformer, and I can put a 5 mA RCD with open-neutral protection on it. My thinking is that a 55V-0-55V center tapped transformer would be safer than either a 240V->110V autotransformer (0-110V) or a 240V->110V isolation transformer, provided that the RCD has open-neutral protection. I was wondering if someone on here is/was running in such a setup, and if you found any caveats or safety issue. E.g. does any Christmas light equipment have a problem with having a voltage above ground on the neutral wire?