self-retracting lifeline srl harness rigging labor work safety operation procedure osha occupational safety health administration

administration alert aluminum arrest balance bamboo barrier care careful danger device discipline dsal durable duty elevation energy facility fall gear grassroot group harness health heavy height helmet high knots labor labour ladder law lifeline light management metal mobile occupational operation order osha platform portable positioning ppe precautions principle procedure protection retracting rig riggers rigging rope rule safe safety scaffold security self srl stairs steady step steps support tall team teamwork wheels work workforce