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Wednesday, April 19, 2023
Question:
Hi Charlie. What code section/article provides the ampacity of an aluminum bus bar 1" x 4" in open air/ substation bus application? Edward Bienvenu
A
Answer:
Hello Edward, thank you for your question. The current rating of open-air-substation busbars is not provided in the NEC®. The manufacturer of the busbar should have technical documentation on the current rating of the busbar, usually provided in Current per mm2 (in2). In addition to the manufacturer, there are several other resources available from associations and engineering groups to assist in determining ampacity rating of a busbar. The Copper Development Association and Aluminum Association are both good resources for this information. Hope this helps.