WAC 296-874-20022. Make sure portable, hook-on, and attachable ladders meet these requirements

(1) You must position portable, hook-on, and attachable ladders so they do not tip the scaffold. (2) You must make sure hook-on and attachable ladders meet all of the following: (a) Specifically designed and used for that type of scaffold; (b) Have rungs that are: (i) Uniformly spaced; (ii) Not more than sixteen and three-quarters inches apart; (iii) At least eleven and one-half inches (29 cm) long; (iv) Lined up vertically between rest platforms. (3) You must position the bottom rung not more than twenty-four inches (61 cm) above the scaffold supporting level. (4) You must have rest platforms at vertical intervals not greater than twenty-four feet (7.3 m) on supported scaffolds.