In the long run, you would probably be much better off looking on YouTube at how Werner Berry made the mains-powered heated bed on the BerryBot and duplicating that. I believe that there are a few threads on the SeeMeCNC forums (they have a section for heated beds) that discuss mains power and other options, and IIRC the most common solution is to run a specific 24V DC power supply with the output trimmed to 19-20 volts. My Onyx bed will not hold 110C wired straight to my beefy 12V ATX power supply, and takes over half an hour to reach 100C unless I place a magazine over the glass for insulation.....
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