UL 112

These requirements cover portable wood ladders of the following types: step, single, extension, sectional, trestle, extension trestle, and several forms of special purpose ladders.

A product that contains features, characteristics, components, materials, or systems new or different from those cove red by the requirements in this standard, and that involve a risk of fire, electric shock, or injury to persons shall be evaluated using the appropriate additional component and end-product requirements as determined necessary t o maintain the acceptable level of safety as originally anticipated by the intent of this standard. A product whose features, characteristics, components, materials, or systems conflict with specific requirements or provisions of this standard cannot be judged to comply with this standard. Where considered appropriate, revision of requirements shall be proposed and adopted in conformance with the methods employed for development, revision, and implementation of this standard.