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    1. It appears that you might be referring to UL 1558, which is a standard for Metal-Enclosed Low-Voltage Power Circuit Breaker Switchgear Assemblies. UL 1558 covers the construction, ratings, testing, and performance of these types of switchgear assemblies. If you have specific questions or need more information about UL 1558 and its application to SG metalclad equipment, please provide more details, and I’d be happy to assist you further.

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