Recently I’ve started seeing this in new construction. Two neutral pigtails from two separate arc fault breakers are twisted and installed on one neutral lug. Is this permissible for Square D arc fault breaker?
NO!
Panel Manufacturer and NEC both state that only ONE Neutral Conductor may fall under a bus bar lug!
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Here the relevant NEC section:
408.41 Grounded Conductor Terminations.
Each grounded conductor shall terminate within the panelboard in an individual terminal that is not also used for another conductor.
Exception: Grounded conductors of circuits with parallel conductors shall be permitted to terminate in a single terminal if the terminal is identified for connection of more than one conductor.
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