 1 edit | Height has absolutely nothing to do with anything. You will die if you fall 20' (if the conditions are right), and you will die if you fall 2000' (there are no right conditions). Get a good harness, something from Elk River is my personal preference. I also use the twin leg fall arrestors. You can use them to ascend and descend the structure, but only clip one leg on at a time. When you reach the working height, you will need a work positioning lanyard in conjunction with the fall arrestor (one leg only!). There are many types available so take your pick. I use an Elk River nylon strap lanyard. They are like $30 so replacing them is not an issue(don't be a cheap-ass. Replace your lanyards). Just remember, always stay tied off. I always have the fall arrestor attached at all times. Falling into a straight rope-type lanyard without a fall arrestor on it will be very very painful and it is not their intended purpose.
I would also get a harness that has a front dorsal ring on it for attachment of laddsafe-style cable brakes if you happen to work on a structure that has a fall arrestor cable running up the ladder. If you are not using the cable brake, you can use the ring to hold a wrench or something with a cheap carabiner.
Speaking of carabiners, any carabiners that you use that are not used for fall arrest should be of the inexpensive type; as in not fall rated. This is so if you happen to get snagged or hung up, and you need to get free because of an emergency situation, it will be easier to break the cheapo carabiner and free yourself than it would be to break the fall rated one.
Steel cable lanyards are NOT recommended.
Think about this....say you fall, and your lanyard catches you. Your tower crew (you do have a ground crew right?) needs to come up and rescue you. So they get to where you are, and low and behold oh crap....you are applying tension to the positioning lanyard, and they cant hoist you up (because you don't have the right rescue kit) so they have to somehow cut the lanyard so they can lower you or at least get it so you can climb down. Since the lanyard is cable, you cant do anything about it (unless you have a saw or something). If it were nylon you could cut it and be done.
This was learned in tower safety school. The instructor used to work as a fireman in a fire/rescue team that did tower rescue and he expressed the dangers of using a cable lanyard.
/end_rant -- Using a non-ports-system OS is like masturbating with a cheese grater
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