UL 60947-4-1: Type 1 & 2 Coordination
What’s behind Type "1" and Type "2" coordinated equipment and what does the standard UL 60947-4-1 include? Due to market requirements in North America for more harmonization, the standard UL 508 for industrial control equipment has been harmonized with selected sections of the IEC 60947 standard for low-voltage switchgear and controlgear. UL published the new harmonized standards for North America in 2007: UL 60947-1. This standard addresses coordination between the branch circuit protective device and the motor starter and differentiates between Type "1" and Type "2" coordination types. This white paper overviews what you need to consider when working with industrial control equipment.