Why can't the wooden ladder in the construction site use the building safety inspection standard?

It is forbidden to use wooden ladders. The wooden ladder on the construction site cannot use the construction safety inspection standard now because:

1. It is forbidden to use wooden ladders in many construction projects, because wooden ladders are generally homemade.

2. In the safety regulations, it is forbidden to use homemade tools and appliances at the construction site. Homemade tools and appliances have no relevant inspection certificates, and ladders should be purchased aluminum alloy ladders.