I have some ideas:
406.5(G) Receptacles shall be enclosed so that live wiring terminals are not exposed to contact
110.7 Wiring Integrity. Completed wiring installations shall be free from short circuits, ground faults, or any connections to ground other than as required or permitted elsewhere in this code.
110.11 Deteriorating agents. I would use "other agents"
But here is the biggie and the one that applies:
110.12(B) Integrity of Electrical Equipment and Connections.
Internal parts of electrical equipment, including busbars, wiring
terminals, insulators, and other surfaces, shall not be damaged
or contaminated by foreign materials such as paint, plaster,
cleaners, abrasives, or corrosive residues. There shall be no
damaged parts that may adversely affect safe operation or
mechanical strength of the equipment such as parts that are
broken; bent; cut; or deteriorated by corrosion, chemical
action, or overheating.