Trade Exam · Module 4
Backflow Prevention
Protect potable water from contamination by identifying hazard levels and selecting correct backflow devices: RP for high hazard, DCVA for medium, vacuum breakers for low hazard.
Key Takeaways
- High-hazard cross-connections (pathogenic/toxic contamination) require Reduced Pressure (RP) Assembly; no exceptions.
Listen, backflow prevention is not optional. In California, it's the law. I have seen health inspectors shut down entire kitchens over a failed backflow device. Do not be that contractor.
Why This Matters on the Exam
The exam hits backflow hard because it's a public health issue. One contaminated water supply affects thousands of people. California Title 24 and health codes mandate it in specific places. The exam expects you to identify hazard levels and select the right device. Get this wrong and you fail.
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