Originally Posted by
Michael Thomas
How does the ANSI date work? Is it date plus four years, or four years on either side?
Basically, the ANSI standard date means it was built that year, or later.
Many standards have a short life, 2-3-4 years, however, some standards are still good a decade later ... all depends on the improvements in what is covered by that particular standard.
If nothing else, you could contact ANSI at:
online chat:
ansionline@ansi.org
e-mail:
info@ansi.org
phone: 212-642-4900
Ask then when was the next updated to that standard Z21.64-1985.
That will tell you it was in or after 1985, and it was in or before the year of the next update.