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What are the High Altitude De-rating (Re-rating) requirements for an I-Line panelboard?

Issue:
High Altitude De-rating requirements for I-Line panelboard

Product Line:
i-Line Panelboard

Environment:
Products sold and used in North America

Cause:
Installation / Setup

Resolution:
Only the circuit breakers in an I-Line panelboard require de-rating (re-rating) for high altitude applications. The bus assembly in the Panelboard is not affected by high altitude and can be used at it's full rating. Tables showing how to de-rate (re-rate) the circuit breakers can be found in Data Bulletin 0100DB0101 which is attached below.