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What is the torque rating for Main lug connection to the bus for an NF442L4C Panelboard ?

Issue:
What is the torque rating for Main lug connection to the bus for an NF442L4C Panelboard ?

Product Line:
NF Panelboards

Environment:
Maintenance

Cause:
Installation

Resolution:
The main lugs use 1/4-20 self tapping screws for connection to the interior bussing, (1) for 100A and 250A interiors and (2) for 400A interiors, The torque is 60-65 in. lbs 
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