Dimensioning and protection of control circuits according to UL

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When switching equipment is used in the United States, it is necessary to comply with UL safety and fire safety standards. The standard-compliant configuration of the switchgear is of central importance. Control circuits according to NEC Class 2 must be limited in power to 100 VA. The right choice of power supply and protection can significantly simplify the process and save costs. We show you the essential requirements for the dimensioning and protection of control circuits.