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Equipment Inspection and Startup
24
Table 11 Torque specifications, general
Electrical connections
with 1 Belleville washer
Electrical connections
with 2 Belleville washers
Torque Torque
lb-in N-m lb-in N-m
Bolt shaft size, in./mm
1/4 / M6 40 4.5 80 9.0
5/16 / M8 80 9.0 180 18.0
3/8 / M10 120 13.6 240 27.1
1/2 / M12 480 54.3 — —
Input and output breakers
Up to 150 amp 80 9.0 160 18.0
175 - 500A 120 13.6 240 27.1
Table 12 Panelboard main circuit breaker torque specifications
Torque
lb-in N-m
Busbar-to-breaker 240 27.1
Table 13 Branch circuit breaker torque specifications
Breaker size lb-in N-m
Up to 30 amp 20 4.0
40 to 100 amp 20 5.1
Table 14 Terminal block compression lug torque specifications
AWG wire size
or range
Torque
lb-in N-m
#14 - #10 35 4.0
#8 40 4.5