This Addendum specifies revised requirements for temperature and humidity in data centers to harmonize with environmental guidelines developed by ASHRAE. These revised requirements should reduce energy consumption for heating, ventilation, and air conditioning; and should provide more flexibility in maintaining temperature and humidity in data centers.

This Addendum also amends the cabling types recognized to include and recommend augmented category 6 (category 6A), provides additional guidelines regarding the use of transmission equipment in data centers, and provides revisions to Annex G.