https://forum.dynamobim.com/t/way-to-get-all-elements-that-are-part-of-the-same-circuit/5962/4
The linked post provides a python script that will select all elements connected to a circuit. From there you should be able to link parameters the way you want to.
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Another solution, that my engineering firm uses is Rushforth Tools. They have a parameter linker that can do what you’re looking to do.
http://www.rushforthprojects.com/