Ladder Duty Rating

The duty rating of a ladder is an indication of the maximum weight capacity the ladder can safely carry.  There is no relationship between ladder length and weight capacity. There are five categories of ladder duty ratings. 

Duty Rating             Ladder Type: ANSI        Working Load (Pounds)

Special Duty                         IAA                                    375

Extra Heavy Duty                IA                                      300

Heavy Duty                           I                                        250

Medium Duty                        II                                       225

Light Duty                             III                                      200

The Ladder Matter plate is compatible with Werner extension ladders, Little Giant extension ladders and Louisville extension ladders.