This Standard specifies requirements for crane collector systems incorporating a sliding or rolling contact device, referred to herein as 'CCS', intended for use on-(a) alternating current systems, the rated voltage of which is greater than 32 V and does not exceed 1000 V, at frequencies from 25 Hz to 60 Hz; and(b) direct current systems, the rated voltage of which is greater than 115 V and does not exceed 1500 V. The Standard does not cover direct-connected systems such as slip rings, cable reelers or flexible cable systems.NOTES:1 Guidance on the installation checks of CCS is provided in Appendix A.2 Appendix B shows the typical components of a CCS, and cross-sections of enclosed CCS.