Busbar connection is the most common electrical connection method in distribution boxes. Primary distribution systems consist of feeders that deliver power from distribution substations to distribution transformers. The following electrical ratings are typical: As a result of locating power transformers and their close-coupled. ed Equipment Register shall be installed on the Company network. Second Hand equipment shall not be installed, unless formal wri ly New Approved Equipment from ICP undertak re or masonry/brick enclosure as agreed on a site-by-site basis. Substations which fall into other categories shall be. This document represents the minimum requirements and specifications for the installation of the electrical underground distribution systems fed from padmounted transformation, serving Secondary Service Accounts, to be transferred to Oncor Electric Delivery Company ownership. Choose the right box based on environment (indoor/outdoor), load capacity, and durability. Check for proper IP/NEMA ratings and material quality. Ensure safe placement: install in.