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c. Placement: Roof mounted WECS must be erected above the roof of a building or structure. The mounts associated with the WECS may extend onto the side of the building or structure. Subd. 4. General Standards. The following provisions will apply to all WECS erected under the provisions of this ordinance: a. Rotor Clearance. Blade arcs created by the WECS shall have a minimum of thirty (30) feet of clearance over any structure or tree within a two hundred (200) foot radius, and maintain at least twenty (20) feet of clearance between their lowest point and the ground. b. Rotor Safety. Each WECS shall be equipped with both a manual and automatic over speed controls to limit the blade rotation within design specifications. c. Color and Finish. All wind turbines and towers shall be white, gray, or other non-obtrusive color. Finishes shall be matte or non-reflective. d. Tower Access. To prevent unauthorized climbing, WECS towers must comply with one of the following provisions: 1. Tower climbing apparatus shall not be located within twelve (12) feet of the ground. 2. A locked anti-climb device shall be installed on the tower. 3. Towers capable of being climbed shall be enclosed by a locked, protective fence at least six (6) feet high. e. Signs. The place of any signs, postings or advertisements shall be prohibited. WECS shall have a sign posted at the base of the tower and said shall contain the following information: Warning high voltage, Manufacturer’s name, Emergency phone number, Emergency shutdown procedures. f. Lighting. WECS shall not have no installed or accessory lighting, unless required by federal or state regulations. g. Electromagnetic Interference. WECS shall be designed and constructed so as not to cause radio and television interference. h. Noise Emission. Have a maximum noise production rating of fifty-five (55) dB fifty (50) dBA and shall conform to this standard under normal operating conditions as measured at any property line.