Supply and DWV Systems

Check your understanding. Passing is 70% — but you can keep going to the next lesson either way.

1. Question 1

   Based on "Water supply", which statement is correct?

   GFCI is required in wet locations and protects people from shock.Never add water on site just to make placement easier.Supply pressure should be 40-80 psi; over 80 needs a pressure-reducing valve.Track RFIs and submittals; unanswered RFIs become delay claims.

2. Question 2

   Based on "Drain, waste, and vent", which statement is correct?

   Home-improvement down payment is capped at the lesser of $1,000 or 10% of the contract price.Drains slope 1/4 in/ft for 2-in and smaller; 1/8 in/ft for larger pipe.Provide compliant temporary utilities, including sanitation and GFCI-protected power.Follow up within 48 hours and explicitly ask for the job.

3. Question 3

   Based on "Fixture units", which statement is correct?

   Shear wall nailing patterns are non-negotiable for seismic resistance.Every trap needs a vent; size pipes from total drainage fixture units.Report serious injuries within 8 hours; keep the Form 300 log for five years.California LLC contractors need an extra $100,000 worker bond and at least $1M of liability insurance.