INFORMATIVE ANNEX I. RECOMMENDED TIGHTENING TORQUE TABLES FROM UL STANDARD 486A-B


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INFORMATIVE ANNEX I. RECOMMENDED TIGHTENING TORQUE TABLES FROM UL STANDARD 486A-B
INFORMATIVE ANNEX I. RECOMMENDED TIGHTENING TORQUE TABLES FROM UL STANDARD 486A-BIn general, always use the torque specifications that come with the equipment being installed. However, these tables are very useful for older equipment or for new equipment that, for whatever reasons, does not come with specifications.This annex also notes that "because it is normal for some relaxation to occur in service, checking torque values sometime after installation is not a reliable means of determining the values of torque applied at installation." This phenomenon is illustrated in Fig. 9-11, where the resistance decreases on initial tightenin…
Citation
Frederic P. Hartwell; Joseph F. McPartland; Brian J. McPartland: McGraw-Hill's National Electrical Code 2017 Handbook, 29th Edition. INFORMATIVE ANNEX I. RECOMMENDED TIGHTENING TORQUE TABLES FROM UL STANDARD 486A-B, Chapter (McGraw-Hill Professional, 2017), AccessEngineering Export