The base should be spaced 1 foot away for every 4 feet it reaches up. Ladders used to reach a walking surface or roof must extend at least 3 feet beyond. Extension ladders need both locks holding to prevent overloading a rail. Step ladders should be securely spread open. Never use a folding step ladder in an unfolded position.
Electrical shock can occur with metal or wet wooden ladders.
Not only is the shock itself dangerous, but it can cause falls resulting in injury. Ladder maintenance Wood ladders should be protected with a clear sealer varnish, shellac, linseed oil or wood preservative. Wood ladders should not be painted, because the paint could hide defects. Check carefully for cracks, rot, splinters, broken rungs, loose joints and bolts and hardware in poor condition. Aluminum or steel ladders should be inspected for rough burrs and sharp edges before use.