11.3 USC Manual of Cross-Connection Control 10th Edition

11.3 USC Manual of Cross-Connection Control 10th Edition

Quick Answer: The USC Foundation for Cross-Connection Control and Hydraulic Research (FCCCHR) publishes the Manual of Cross-Connection Control, 10th Edition—a primary field-test procedure and criteria reference used throughout North American tester training. Headline RP values many programs drill are relief ≥ 2.0 psid, check #1 ≥ 5.0 psid and above the relief opening point, and check #2 tight against backpressure (no psid value is recorded for it). PVB/SVB tests focus on air-inlet opening and check tightness. ASSE recognizes USC 10th among several approved procedure families; your practical must follow one approved method consistently.

Where the USC Manual sits among “codes and standards”

Students often dump every document into one pile labeled “the code.” Separate the shelves:

The USC Manual is not a personnel certificate and not a substitute for local ordinance. It is a procedure and criteria book (and broader cross-connection reference) that schools and purveyors use so two competent testers produce comparable results.

USC FCCCHR and the 10th Edition identity

USC here means the University of Southern California Foundation for Cross-Connection Control and Hydraulic Research—not “United States Code.” On the exam, USC 10th almost always points to field-test methodology and acceptance criteria used for RP, DC, PVB, and SVB evaluation. Your training course may teach USC 10th exclusively, or may teach another ASSE-recognized procedure that is equally valid if applied correctly. The credential cares that you use a recognized method correctly and completely, not that you recite the title page of every manual ever published.

Why a published procedure beats “tribal knowledge”

Without a published method, testers invent order-of-operations differences: which shutoff closes first, when to bleed, how to load a relief valve, whether a reading is static or dynamic noise. Those differences create:

• False fails that force unnecessary repairs.
• False passes that leave the public supply unprotected.
• Un-defendable reports when a purveyor or court asks how you obtained a number.

A recognized manual gives shared vocabulary: test cock numbers, gauge high/low connection logic, buffer/relief relationships, and numeric limits. That is why Series 5000 programs require procedure training and why the practical exam watches sequence as much as final numbers.

Key RP criteria (USC 10th-style values you must know cold)

These headline numbers appear throughout this study guide because they are high-frequency exam and field facts. Commit them in order of the story the RP tells:

Buffer concept in one sentence: Check #1 must be strong enough—not only “above 5.0” as a naked number, but above the relief’s opening point—so the relief remains the intentional leak path under the right failure modes rather than a silent, non-protective assembly.

When troubleshooting, map symptoms to these criteria: relief opens early or late; check #1 soft; check #2 leaks back. Procedure chapters earlier in this guide walk the hose sequence; this chapter locks the document source of the criteria.

DC criteria (same manual family)

A double check has no relief valve, so the manual focuses on both checks holding to the published tightness standard (commonly ≥ 1.0 psid each under USC-style testing). Exam distractors sometimes paste RP relief numbers onto a DC stem—reject them. If the assembly is 1015, you are not looking for a 2.0 psid relief opening.

PVB and SVB criteria (air inlet + check)

Pressure-type vacuum breakers (1020) and spill-resistant vacuum breakers (1056) share a backsiphonage-protection architecture: a check and a spring-loaded air inlet that opens toward atmosphere when inlet pressure falls. Under USC-style methods, remember the class of values:

Exact hookup steps differ slightly between PVB and SVB because of spill-resistant design details, but the criteria story remains air-inlet opening plus check tightness. Do not apply RP relief ≥ 2.0 and check #1 ≥ 5.0 numbers to a PVB stem.

ASSE-recognized procedures list (know the idea, not only one brand)

ASSE programs recognize that more than one carefully written method can produce valid results. The recognized-procedure family commonly discussed in tester education includes:

You do not need to perform every method on exam day. You do need to know that:

1. Multiple procedures can be recognized.
2. Your school teaches at least one recognized procedure thoroughly.
3. The practical requires you to use an approved procedure consistently—same method from first shutoff to final reading.
4. Mixing steps from two manuals mid-test (for example USC check loading with an incompatible hose order from another method) is how candidates create invalid data.

Consistency rule for the practical exam

Think of the procedure as a protocol, not a suggestion list:

1. Identify the assembly and confirm test cocks/shutoffs are present and usable.
2. Hook up high/low hoses per the method for that assembly type.
3. Bleed air completely; trapped air fakes differentials.
4. Execute shutoff and valve sequences in published order.
5. Record the values the method defines (relief opening, check differentials, air-inlet opening).
6. Compare to the method’s pass/fail table—not to memory of a different manual.
7. Restore the assembly to service configuration and complete the report.

If your school’s approved method is USC 10th, stay in USC 10th for all four assemblies. If your jurisdiction’s practical specifies a particular recognized method, that specification controls the exam floor.

Manual vs manufacturer vs purveyor form

Even with USC 10th mastery:

• Manufacturer instructions still govern repair parts, torque, orientation limits, and freeze kits.
• Purveyor forms still dictate which fields, stickers, and submission deadlines count as a legal annual test in that system.
• Local criteria rarely invent different relief physics, but they may impose stricter administrative rules (test due dates, online portals, assembly approval lists).

When a written item asks for the source of field-test differential criteria taught in many national programs, USC Manual 10th Edition (or “a recognized field-test procedure such as USC 10th”) is the correct shelf—not Series 5000 alone and not the Safe Drinking Water Act text.

High-yield criterion drill (say these out loud)

• RP relief: ≥ 2.0
• RP check #1: ≥ 5.0 and above relief opening
• RP check #2: tight against backpressure, no psid; DC checks: ≥ 1.0 psid each
• PVB/SVB air inlet: ≥ 1.0 class opening
• PVB/SVB check: ≥ 1.0 class tightness
• Procedure: recognized + consistent
• Manual role: how to test, not who may test

Lock those, and most “codes and manuals” items that touch USC become free points.