I found this on the LEVA (Light Electric Vehicle Association) website:
Regulations of E-Bikes in North America NITC-RR-564 August 2014.
You can download it here: http://ppms.otrec.us/media/project_files/NITC-RR-564_Regulations_of_E-Bikes_in_North_America_1.pdf
Appendix A (pages 48-49) has a...