Safety, Health, and Jobsite Practices
Hazard Awareness
Plumbing work involves confined spaces, trenching, electrical hazards, and exposure to sewage and chemicals. Know the basics of confined-space entry: test the atmosphere, ventilate, use a permit, and have a rescue plan. Trenching rules require sloping, shoring, or shielding, and a competent person must inspect excavations. Never enter an unprotected trench.
Health and Sanitation
Workers must use personal protective equipment appropriate to the task: gloves, eye protection, respirators, and hearing protection. Hand washing and disinfection are essential after contact with sewage. Know how to protect potable water during repairs - use backflow prevention and disinfection procedures when lines are opened. Lead and asbestos may be present in older buildings, and the code and regulations require safe handling.
Tools, Ladders, and Electricity
Ladder safety, tool guarding, and lockout/tagout are common exam topics. Electrical safety around water is critical: use ground-fault protection, keep cords out of water, and never work on energized equipment. Know that soldering requires fire protection and ventilation, and that fuel gas work requires leak testing before lighting appliances.
Traps in Questions
Watch for questions that treat a trench box as optional, that assume a respirator is needed for all sewer work (it depends on the atmosphere), or that ignore the requirement to notify utilities before digging. Also remember that a jobsite injury must be reported per the applicable requirements and that housekeeping prevents slips and fires.
Worked Example
For a 6-foot-deep trench in stable soil, the rule of thumb is that any trench 5 feet or deeper requires protective systems unless the competent person determines otherwise; a 6-foot trench needs sloping, shoring, or a trench box, plus a means of exit within 25 feet of travel.