User replacing original 2-prong power cord on RC-7A with 3-wire grounded pigtail. Transformer has no ground wire. Asks if grounding is a legitimate concern and how to do it.
Matt: "I wouldn't worry about the ground wire. As you pointed out, it wasn't grounded all these years. Some of the old transformers had a tab or screw which was to serve as the ground. I can't say I ever remember any of those actually being grounded either."
The controller's internal transformer isolates the low-voltage side. The 2-prong design was standard for this era; adding a ground to the line cord doesn't connect to anything internally. Just connect the two power wires; cap off or ignore the ground wire.
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