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100+ Free PGDB Certifying Plumber Practice Questions

NZ PGDB Certifying Plumber Examination practice questions are available now; exam metadata is being verified.

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2026 Statistics

Key Facts: PGDB Certifying Plumber Exam

100

Practice Questions

OpenExamPrep

65-70

Exam Questions

PGDB

2.5 hours

Time Limit

PGDB

NZD $410

Exam Fee (GST incl.)

PGDB

~75% / 25%

Electronic / Paper Split

PGDB

G12 & G13

Core Building Code Clauses

MBIE / NZBC

The NZ PGDB Certifying Plumber Examination is the Plumbers, Gasfitters and Drainlayers Board registration exam that qualifies a plumber to certify and supervise restricted sanitary plumbing work in New Zealand. It is computer-based via Aspeq, lasting 2.5 hours with 65-70 questions, of which about 75% are answered electronically and 25% on paper diagrams, for a fee of NZD $410. Reference codes and standards are supplied as a PDF in the exam, and the Board recommends 200+ hours of study. Content spans NZBC G12 Water Supplies and G13 Foul Water, AS/NZS 3500.1-3500.4, sanitary plumbing, drainage and venting, hot-water storage and tempering, safe trays, backflow prevention and the PGDB Act 2006. This free prep includes 100 research-based practice questions with explanations and an AI tutor.

Sample PGDB Certifying Plumber Practice Questions

Try these sample questions to test your PGDB Certifying Plumber exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1Under the New Zealand Building Code, which clause sets the performance requirements for the safe supply, storage, reticulation and delivery of hot and cold water?
A.Clause E1 Surface Water
B.Clause G12 Water Supplies
C.Clause G13 Foul Water
D.Clause H1 Energy Efficiency
Explanation: NZBC Clause G12 Water Supplies governs the safe supply, storage, reticulation and delivery of potable hot and cold water to fixtures. Acceptable Solution G12/AS1 cites AS/NZS 3500.1 and 3500.4 as compliance pathways.
2Which New Zealand Building Code clause sets the performance requirements for the safe disposal of foul water to prevent illness and loss of amenity from odour?
A.Clause G12 Water Supplies
B.Clause G13 Foul Water
C.Clause E1 Surface Water
D.Clause F4 Safety from Falling
Explanation: NZBC Clause G13 Foul Water requires the safe and hygienic disposal of foul water so people are protected from illness and loss of amenity caused by odour or accumulated matter. G13/AS3 cites AS/NZS 3500.2.
3Under the updated G12/AS1 (from 1 November 2024), what is the maximum temperature at which hot water may be delivered to a sanitary fixture used for personal hygiene in a standard residential dwelling?
A.45 degrees Celsius
B.50 degrees Celsius
C.55 degrees Celsius
D.60 degrees Celsius
Explanation: The updated G12/AS1 lowered the maximum delivery temperature at personal-hygiene fixtures in dwellings from 55 to 50 degrees C to reduce scald risk. A tempering valve or thermostatic mixing valve is required to achieve this.
4G12 requires that water in a hot-water storage system be heated to at least what temperature to control the growth of Legionella bacteria?
A.50 degrees Celsius
B.55 degrees Celsius
C.60 degrees Celsius
D.70 degrees Celsius
Explanation: Stored hot water must reach at least 60 degrees C to control Legionella, which proliferates between roughly 20 and 45 degrees C and is killed at 60 degrees C. The stored water is then tempered down to a safe delivery temperature at the fixture.
5A new mains-pressure hot-water cylinder is installed in a dwelling. What device is required to limit the temperature of water delivered to a bathroom basin and shower to the maximum safe level?
A.An expansion control valve
B.A tempering valve or thermostatic mixing valve
C.A pressure-reducing valve
D.A non-return (check) valve
Explanation: A tempering valve (or thermostatic mixing valve) blends 60 C stored water with cold water to deliver no more than 50 C at personal-hygiene fixtures, as required by G12/AS1. It is mandatory on new and replacement installations.
6Which Australian/New Zealand Standard, cited by G12/AS1, covers the design and installation of water services (cold and hot water supply)?
A.AS/NZS 3500.1 Water services
B.AS/NZS 3500.2 Sanitary plumbing and drainage
C.AS/NZS 3500.3 Stormwater drainage
D.AS/NZS 5601.1 Gas installations
Explanation: AS/NZS 3500.1 Water services is the cited compliance standard for cold-water and water-supply design and installation under G12. AS/NZS 3500.4 covers heated water services.
7Which part of AS/NZS 3500 covers sanitary plumbing and drainage (above-ground discharge of foul water)?
A.AS/NZS 3500.1
B.AS/NZS 3500.2
C.AS/NZS 3500.3
D.AS/NZS 3500.4
Explanation: AS/NZS 3500.2 Sanitary plumbing and drainage is the standard cited by G13/AS3 for the discharge of foul water from sanitary fixtures, covering traps, branches, stacks and venting.
8A sanitary plumbing system is to be hydrostatically tested in accordance with AS/NZS 3500.2. What is the maximum head of water allowable for the test?
A.2 metres
B.3 metres
C.4 metres
D.6 metres
Explanation: Under AS/NZS 3500.2 the hydrostatic test on sanitary plumbing applies a maximum head of 3 metres of water above the highest point being tested, held for the minimum test period to confirm watertightness.
9What is the minimum test duration when hydrostatically testing a sanitary plumbing system to AS/NZS 3500.2?
A.5 minutes
B.10 minutes
C.15 minutes
D.30 minutes
Explanation: AS/NZS 3500.2 requires the hydrostatic (water) test on a sanitary plumbing system to be held for a minimum of 15 minutes so the inspector can confirm no leakage or loss of head.
10Under G13/AS3 and AS/NZS 3500.2, what is the nominal depth of water seal required for a soil-fixture trap?
A.25 mm
B.40 mm
C.50 mm
D.75 mm
Explanation: The nominal depth of water seal for soil-fixture traps is 50 mm (plus or minus 5 mm). Under load testing, the seal must not be reduced below a 25 mm minimum to keep sewer gases out of the building.

About the PGDB Certifying Plumber Practice Questions

Verified exam format metadata for NZ PGDB Certifying Plumber Examination is pending. The practice questions above remain available while official exam length, timing, passing score, fee, and administrator details are reviewed.