To be fair, anyone who trys to write the rules will have one or two points picked at. To to level the field, here is what I would put as the guidance rules.
When not to use a ladder
1. Windy conditions, if winds are light and work can continue, never leave a ladder unattended especially when extended and lay the ladder flat on the ground when working away from it to avoid it being blown over.
2. Only to be used on suitable surfaces.
Examples of surfaces that would be dangerous
1. marbel floors(however ladder matts can be put down to work on this)
2. Wet decking (depending on how bad mats could be used)
3. icy roads or pavements.
4. steep slopes, or grassy verges.
5. Not to be used on unstable e.g. rubble, boulders.
Caution to be used in rain due to additional slipping hazards.
When setting a ladder
1. The correct 1/4 angle should be used with a little give either way but only buy 3/4 degrees either way, but never extreamly steep or sallow.
2. If it is slightly windy not that bad that you have to stop, do one of two things
1. Rack it tightly under the sill that over hangs at the base of the window, to stop it being blown either from one side to another.
2. Rack it within the frame of the window, to stop it being blown over.
3. Always ensure that the top two feet have level contact, and the bottom tow feet have level contact. Use a wedge or other leveling equipment to ensure this is followed.
Climbing, working on and decending the ladder
1. Use good foot wear with good grip.
2. Always hold the rungs and, never slide you hands down the rails as you descend, or ascend.
3. When working on the ladder never over reach, and use small hand held extensions instead.
4. If the window is tall, always rack above the window to avoid you having to over reach also
5. Keep three points of contact while working on the ladder.
Working on flat roofs
1. Rack the ladder 1 meter above the shelf of the roof
2. never stand on a rung above the point where the ladder contacts the shelf of the roof.
3. Never use ladders in this manor if there are winds to blow the ladder over while you leave it unattended. In this instance you would have to secure it or have someone foot it.
Maintaining and checking your ladder
1. Feet should always be replaced before the grip fades
2. Ladders should be regularly checked to ensure there is not damage that would cause the ladder to fail
3. If there is damage to a ladder, bent rails, rungs damaged(not just scraped - damaged to the point they could break) or missing. The ladders should be replaced.
what height?
No higher than 30 feet, however this is only to allow you to rack above tall windows, and you yourself(your head, not your feet) should not be higher than 30 feet from the bottom of the ladder.
You want to add anything, pick at a few points feel free!