Official copies of the standard are not available for free as public downloads. To obtain the full, authorized version of Standard 90.4, you should visit official industry repositories:
Authorized seller of American National Standards. ashrae 90.4 pdf
This allows for trade-offs between the MLC and ELC. For instance, if you design an exceptionally efficient electrical distribution system (low ELC), you can offset a slightly less efficient mechanical cooling system (higher MLC), provided the combined total meets the standard's goals. Why You Need the Official PDF Official copies of the standard are not available
To help you get exactly what you need for your project, please let me know: authorized version of Standard 90.4
