Counties adding codes to NEC

I would like to know if anyone has successfully argued against counties or cities that add or modify the NEC. I am working in a county that has a 10 opening rule for lighting, receptacles etc. The kitchen we are doing is getting recessed cans, pendants and under cabinet lights that are all LED. The total wattage is under 500 watts on a 15 amp circuit. I am not allowed this load because it is more than "10 openings". I remember talking to a State Electrical Inspector that told me that legally counties or cities are not allowed to modify a national document like the NEC. Can anyone help me?