Safety, Tools, and Job-Site Practices
Safety questions are not filler - they are pass/fail material for a working contractor. California enforces Title 8 (Cal/OSHA) rules on every jobsite, and the exam tests the ones plumbers actually break.
Programs and personal protection
Every employer needs a written Injury and Illness Prevention Program, hazard communication training with SDS access, and task-specific PPE: safety glasses, gloves, hearing protection when cutting cast iron, and respirators for solvents and dust. Construction receptacles and cords require GFCI protection and inspection.
Excavation and confined space
- Protective systems are required at 5 ft deep in California; a competent person inspects daily.
- Spoil and materials stay at least 2 ft back from the edge; a ladder or ramp within 25 ft of workers.
- Call 811 at least two working days before digging to have utilities marked.
- Sewers, vaults and tanks are permit-required confined spaces: test oxygen (19.5 to 23.5 percent), flammables and hydrogen sulfide, use an attendant and a rescue plan.
Hot work and hazardous materials
Soldering and brazing need a hot work permit, heat shields against framing, ventilation, and a fire watch during and after the work. Never solder a line that contained gas until it is purged and isolated. Pre-1978 housing triggers lead-safe work practices; old pipe insulation may contain asbestos and requires a certified abatement contractor. Air testing of piping stores energy - regulate the pressure, keep people clear, and never use oxygen.
Worked example
A 6 ft deep, 20 ft long sewer trench in Type B soil. Protection is mandatory at 5 ft: either slope to 1:1, which widens the top to about 18 ft, or use a trench box or shoring. Keep the spoil 2 ft back, set a ladder within 25 ft of the crew, call 811 two working days ahead, and have the competent person check the excavation before entry each shift.
Traps
- Treating 5 ft as shallow enough to skip protection.
- Digging before the 811 ticket expires.
- Soldering next to combustible framing without a shield or fire watch.
- Assuming a confined space is safe because it smells fine.