I'm trying to use a single 24VDC power supply but rig it to give a heating coil the equivalent of 24Volts but at +12/-12 in reference to ground for safety reasons. Is this as simple as a voltage divider with a high value resistor to ground? Would that work or just kind of short out the supply? Is the negative terminal of a power supply normally connected to ground or is it floating? Let me know if there's a cheap, simple way of accomplishing this aside from buying two 12V power supplies or one that outputs +/-12VDC. Thanks.