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I have an older load center with a printed directory labels with red lines and an ``R`` printed on spaces 17, 18, 19, 20. What does this mean?

That marking is an indication of spaces in which tandem breakers are permitted to be installed in that load center. The ``R`` indicates the right hand circuit of an old tandem breaker which was constructed with the handle throws above and below each other. These would then be on the left and right as the breaker was installed in the panel.

CTA-ID : 2021493
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