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What does the "R" (or "R-Handles" pointing to dash lines) printed on spaces on the old load center directory labels mean?

Issue:
Installation of Replacement Tandem Breakers in non-Class CTL load centers

Product Line:
Load Centers

Resolution:
That marking is an indication of spaces in which tandem breakers (Replacement Tandem Breakers only) are permitted to be installed in that load center. The "R-Handles" indicates the second handle circuit of an old style 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.

Note: these load centers can NOT accept QOT tandem circuit breakers. They only can accept the replacement tandem breakers for use in non-class CTL load centers found in the below table:

Replacement Tandem Circuit Breakers

Ampere Rating^[2]	Cat. No.^[4]
1P—120/240 Vac—1 Space Required
15 A and 15 A	QO1515
15 A and 20 A	QO1520
20 A and 20 A	QO2020
20 A and 30 A	QO2030
30 A and 20 A	QO3020
Two 1P Individual Trip—120/240 Vac—2 Spaces Required
15 A and 15 A	Order Two QO1515 or QO2020 circuit breakers and handle tie QOTHT
15 A and 20 A
20 A and 20 A	—
20 A and 30 A	QO20303020^[11]
30 A and 20 A	—

[2] 10–30 A circuit breakers are suitable for use with 60^oC or 75^oC conductors. 35–125 A circuit breakers are suitable for use with 75^oC conductors.

[4] UL Listed as HACR type for use with air conditioning, heating and refrigeration equipment having motor group combinations and marked for use with HACR type circuit breakers.

[11] Includes two circuit breakers (one QO2030 and one QO3020) and handle tie QOTHT.