Is there a standard for server PSU dimensions?

Question

I don't have a lot of knowledge about server technology, but a simple question which I cannot get an answer for by seraching the internet.

Are server PSUs following a norm in their dimensions (length, width, height)?

Looking at the connectors via image search, which are quite different between brands and models, I get the feeling that the sizes might vary accordingly. Since rack stacking is somewhat normed afaik, some sizes might be limited by these circumstances. Is that correct?

Answer 1

The most relevant norm is the RU (rack units). This is respected by all server PSUs. An 2U PSU will never fit physically in the position of a 1U PSU. Weight is not relevant. X x Y are usually 225-230 x 100 while Z is the size RU-related.