Some ANSI standards are freely available through the CSA Community Group (registration required): https://community.csagroup.org/welcome. Once registered browse under the ANSI heading in the View Standards section of the website.
Older ANSI standards (1995 and older) are available in print in the ASRS storage in the Irving K. Barber Learning Centre. Use this record to place an ASRS request.
Ask a librarian if you need help.