Class 1 circuits, that are not functionally associated, must be separated from power conductors by a solid and firmly fixed barrier.

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This is a requirement stated by the National Electrical Code (NEC) in section 725.136(A). Class 1 circuits, which are low voltage signaling and control circuits, must be separated from power conductors by a barrier to prevent any potential interference or safety hazards.

Class 1 Circuits, That Are Not Functionally Associated, Must Be