ASHRAE Standard 90.4, Energy Standard for Data Centers , is a copyrighted document that can be purchased, though free read-only versions of the 2022, 2019, and 2016 editions are available through the ASHRAE website
The ELC ensures that your power delivery path (from utility meter to the IT rack) does not waste excessive energy as heat. ashrae 90.4 pdf
Before 90.4, data centers often struggled to meet the prescriptive requirements of building codes designed for offices (like window-to-wall ratios) [5]. This standard allows engineers to trade off performance between different systems; for example, a highly efficient cooling system might compensate for a slightly less efficient power distribution setup, provided the overall "Design MLC" and "Design ELC" remain below the maximum limits set for the specific climate zone [6]. How to Access the PDF ASHRAE Standard 90
If you are a student, many engineering universities have a license to the ASHRAE Digital Library. You can download the PDF for free via your campus proxy. ASHRAE's Official Blog : The ASHRAE blog features
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