berkeman
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It's good that you plan to use a transformer to isolate the AC Mains connection from your application circuit. But you still did not address the Line/Neutral question, the Switch question, or the Fuse question that I asked. That's worrisome for me.Aidan345733 said:I will not connect directly into the AC mains but I was planning on using the 120 volts that is standard in most outlets using a proper transformer that I have acquired.
The wire insulation is only a small part of the safety aspects of using such a power source. If your transformer is doubly-insulated and you use other proper construction techniques, then the 3-prong power cord is not needed. If you use a singly-insulated power supply design, then you generally will need to use a 3-prong power cord and attach the Earth Ground wire to your project in some very particular ways.Aidan345733 said:The connected wire will be double insulated and will have a three prong connection in the outlet.
I would recommend that you just use a pre-made 120V/24VAC transformer that already has appropriate UL safety approvals (or other agency approvals, depending on where you live). That is by far the best approach for your early electronics projects, until you can find a local Mentor to help you with safety aspects of higher-voltage AC Mains based projects. You can use such a packaged transformer for many of your DIY projects going forward. They are available in many power levels at reasonable prices.
https://cdn3.volusion.com/czamo.vpczb/v/vspfiles/photos/115-24VAC1000-4.jpg?1492079340