Industrial plants use electrical power equipment to distribute power for lighting@ driving motorized devices@ operating HVAC equipment@ and control of equipment. The main focus of this paper is to provide updated information on heat losses by various types of electric power equipment. The information is organized by equipment type@ and practical guidance on using this information to compute losses under different conditions is provided. The effect of loading margin used by designers in sizing the electric equipment@ load diversity@ and ambient temperature on heat loss is discussed. Uncertainties in the results for different pieces of equipment are presented. Also@ a comparison of the results to the previously published information is provided.