S.C. Code Ann. § 56-5-4550

Every such reflector shall be mounted on the vehicle at a height not less than twenty inches nor more than sixty inches measured as set forth in Section 56-5-4480 and shall be of such size and characteristics and so mounted as to be visible at night from all distances within three hundred feet to fifty feet from such vehicle except that visibility from the greater distance is herein required of reflectors on certain types of vehicles.