All plans must be on tracing cloth of good quality, and shall be of one of the following sizes, the figures indicating inches: 10 x 15; 15 x 21; 21 x 32; 30 x 36; 36 x 42; or 42, 48, or 54 wide without restriction as to length; which plans shall be prepared and drawn according to some one of the following scales: 10, 20, 30, 40, 50, 100, 200, 300, 400, 500, 1000, 2000, 3000, 4000, or 5000 feet to an inch.