SO cord electrical boxes

[brandtew]

Can someone tell where in the NEC does it not allow outlet boxes at the end of a SO cord to have knockouts

 

[don_resqcapt19]

314.23(H)(1) is normally cited for that application.

 

[jim dungar]

Can someone tell where in the NEC does it not allow outlet boxes at the end of a SO cord to have knockouts

This is not a clear NEC issue. OSHA tends to not like the knockouts (someone's finger could enter a missing one), but the NEC usually gets blamed for it.

Along with Don's reference, don't forget the catch-all 110.3.