What are these symbol from single-line diagrams of switchboards?
It seems they are not always related to optical fiber, as shown on this snapshot:
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\$\begingroup\$ electronics.stackexchange.com/a/586057/152903 \$\endgroup\$– Solar MikeCommented Sep 9, 2021 at 12:05
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\$\begingroup\$ electronics.stackexchange.com/questions/586019/… \$\endgroup\$– Corentin PaneCommented Sep 9, 2021 at 13:02
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