Final answer:
In a deep trench welding situation, the essential PPE includes a hard hat for protection from falling debris, a respirator to filter toxic fumes and particles, and hearing protection to prevent damage from loud noises.
Step-by-step explanation:
In addition to protective goggles, when welding pipe in a deep trench, a worker should wear additional personal protective equipment (PPE) such as a hard hat, respirator, and hearing protection. A hard hat is essential to protect against falling debris, which is a common hazard in trench work. A respirator is necessary to guard against the inhalation of fumes and airborne particles, which can be toxic or cause respiratory issues. Hearing protection is required to prevent hearing damage from the loud noise generated by welding equipment. Each piece of PPE is designed to mitigate specific risks associated with welding activities and ensure the safety and health of the worker in the trench.