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Liquid electrical insulating materials|Hygiene|Fire safety|Insulating oils|Oil-filled electrical equipment|Protective clothing|Accident prevention|Safety measures|Transformers|Marking|Eye protectors|Protective footwear|Polychlorinated biphenyls|Hazards|Protective gloves|Maintenance|Design|Identification methods|Contamination|Electrical equipment|Oil-immersed transformers|Pollution|Occupational safety