Frequently asked questions

FA89727

27 May 2022

Issue:
Wire size for Multi 9

Product Line:
Circuit breakers

Resolution:
Wire size and torque are as noted below. Always confirm with markings on the circuit breaker. Only one wire can be installed per terminal. There are no replacement lug kits available for the Multi 9 breakers. The wire strip length is 14 mm.

UL 1077 Supplementary Protectors
0.5 to 25 A: #18 to #4 AWG (1 to 25 mm²) cables; torque 22 lb-in (2.49 N•m)
30 to 63 A: #18 to #2 AWG (1 to 35 mm²) cables; torque 31 lb-in (3.50 N•m)

UL 489 240 Vac
0.5 to 25 A: #14 to #4 AWG (2–25 mm²) cables; torque to 22 lb-in. (2.48 N•m)
30 to 35 A: #14 to #2 AWG (1–35 mm²) cables; torque to 31 lb-in. (3.52 N•m)

UL 489 Listed 480 Vac
All amperages: #18 to #16 AWG (1–1.5 mm²), Cu only stranded wire; torque to 7 lb-in (0.68 N•m); #14 to #10 AWG (2–5 mm²), Cu only solid or stranded wire; torque to 14 lb-in (1.6 N•m)

IEC Rated C60 C60N/H/L Except C60L-MA
0.5 to 25 A: #18 to #4 AWG (1–25 mm²) Cu only cables; torque to 22 lb-in (2.5 N•m)
30 to 63 A: #18 to #2 AWG (1–35 mm²) Cu only cables; torque to 31 lb-in (3.5 N•m)