Portable ladders come in many kinds. One feature is the expected load that will be placed on the ladder.
Parameters:
(1) duty rating
(2) type
(3) maximum load in pounds
|
Duty Rating
|
Type
|
Maximum Load
|
|
light
|
III
|
200
|
|
medium
|
II
|
225
|
|
heavy
|
I
|
250
|
|
extra heavy
|
IA
|
300
|
|
special
|
IAA
|
375
|
