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We noted in Part 6 that the the power supply for an LED sign illumination system is a class 2 power supply. On the load side of this power source, you must use listed Class 2 cable that complies with Table 725.154, and its conductors can’t be smaller than 22 AWG [600.33(A)].
The following requirements for installing these Class 2 cables and conductors [600.33(B)(1)] also appear in other, unrelated Articles:
If subject to physical damage, provide protection per 300.4. When connecting cables and conductors, use only listing insulating devices. The connections must be accessible after installation [600.33(B)(2)].
Ground and bond LED sign systems the same way [600.7] you do other sign systems [600.33(D)].
The final two sections of Article 600 address neon tubing and electrode connections.