Dedicated circuit for LED Sign Lights

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I am thinking to prevent any issues with surges sharing a circuit would possibly affect the lifespan of the Outdoor sign? ...or is a separate circuit a waste of time with soo little power consumption?

 

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What about 600.5?

600.5 Branch Circuits.
(A) Required Branch Circuit. Each commercial building and each commercial occupancy accessible to pedestrians shall be provided with at least one outlet in an accessible location at each entrance to each tenant space for sign or outline lighting system use. The outlet(s) shall be supplied by a branch circuit rated at least 20 amperes that supplies no other load. Service hallways or corridors shall not be considered accessible to pedestrians.

 

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What about 600.5?

Thanks... have run the #12/2 already, and will break open the CEC...