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What is the meaning of the forms M and M54 on busway products?

Issue:
Identify forms M and M54

Product Line:
I-Line Busway

Environment:
Products sold in North America

Resolution:
The M suffix indicates that the busway was designed to meet the drip resistant requirement in General Motor`s busway specification 13E.
The M54 suffix indicates that the busway was designed to achieve a IP54 degree of protection rating as defined by the International Standard IEC 529

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