3EDT, if the attempt is made to use it as an actual scale, would divide the tritave into three equal parts, each of size 633.9850 cents, which is to say 3^(1/3) as a frequency ratio. If we want to consider it to be a temperament, it tempers out 9/8 as well as 2edo.
Factoids about 3EDT
75/52 is a good rational representation of the cube root of 3.
3EDT is closely related to the tricot temperament, which tempers out |39 -29 3>, the tricot comma.