MSHA - Code of Federal Regulations - 30 CFR 77.1432
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MSHA - Title 30 CFR
30 CFR § 77.1432
Initial measurement.

After initial rope stretch but before visible wear occurs, the rope diameter of newly installed wire ropes shall be measured at least once in every third interval of active length and the measurements averaged to establish a baseline for subsequent measurements. A record of the measurements and the date shall be made by the person taking the measurements. This record shall be retained until the rope is retired from service.

[60 FR 33719, June 29, 1995]