What are the safety rules for class 3?

Safety rules for Class 3 depend on whether you mean Class 3 laser, Class 3 hitch, Class 3 truck, or Safety Category 3, but general principles involve higher precautions due to increased risk. For Class 3 lasers which can cause eye damage, safety rules include never looking directly into beam, wearing appropriate laser safety goggles with correct optical density, controlling access to area with warning signs, using beam blocks, and having trained laser safety officer. For Class 3 tractor hitch for 80 to 225 horsepower tractors with lift up to 8000 pounds, safety rules include matching implement category to tractor, using correct pins 1-7/16 inch lower and 1-1/4 inch top with linch pins, checking lift capacity to avoid front end lift, using ROPS and seatbelt, keeping bystanders away, shielding PTO, and not overloading hydraulics. For Class 3 trucks over 10000 pounds GVWR, safety rules include DOT inspection, proper loading, and CDL requirements. For Safety Category 3 per EN ISO 13849, safety rules require redundant dual-channel architecture where single fault does not cause loss of safety function, periodic diagnostic testing, using well-tried components, and documentation of fault analysis. General safety rules for Class 3 high-risk activities include risk assessment, PPE, training, emergency procedures, and good ventilation and HEPA filtration if chemicals or pathogens involved, similar to negative pressure rooms for airborne hazards.