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Event Series Event Series: Plumbing

Plumbing – Isometrics Training – Zoom Only

November 6, 2023 @ 6:30 pm - 9:00 pm

This is a Zoom-Only Isometrics Training class that is hosted one weeknight per month from 6:30pm to 9:00pm. The Plumbing Trade exam requires you to create 5 isometric drawings which will be scored for accuracy.


Here is the link to the Plumbing Contractor Candidate Handbook:


Examination at a Glance:

The Plumbing General Trade Knowledge examination has a total of 160 possible points. The
examinations consist of 110 questions and 5 (five) Isometric drawings. Each of the isometric drawings
is worth up to a maximum of 10 points. To pass the examination a candidate must have a score of 112
out of 160 possible points.

The multiple-choice portion of the Plumbing General Trade Knowledge examination consists of
questions relating to general trade knowledge. The content areas to be covered and the approximate
weights assigned to each are as follows:

1. 20% Drainage
2. 20% Water Distribution
3. 15% Natural Gas Piping
4. 20% Medical Gas Piping
5. 10% Industrial Piping
6. 5% Swimming Pools, Wells and Irrigation
7. 5% Solar
8. 5% Fire Protection

The Isometric Drawing portion of the Plumbing General Trade Knowledge examination consists of
five plumbing isometric drawings. The content of the drawings shall conform to the content areas
listed above in content areas 1 through 8. The following are the criteria and points used by the graders
to evaluate each of the five isometric drawings:

a) Legibility. Drawing is clear and readable. Drawing is sufficient in size. Lines and labels are
distinguishable. (8 points)
b) Orientation. All fixtures are shown in the correct location relative to each other. (20 points)
c) Flow. Direction of flow is shown when going from vertical to horizontal. The direction of flow
must be indicated even if the direction is implied for all waste lines and all fixture connections.
Direction of flow is not required for vent lines. (12 points)
d) Angles. Isometric drawing uses 30-60-90 degree angles. All angles used on the drawing are
displayed at the appropriate orientation. (8 points)
e) Piping. All pipes, fittings, traps, clean-outs, and similar portions of the piping structure are
included on the drawing. All piping is shown exactly as on the drawing (regardless of specific
code requirements). The piping must display the correct elevation in reference to the floor plan.
(20 points)
f) Labeling. All fixtures are labeled according to the legend provided in the examination
instructions. (4 points)
g) Vents. All vents are properly indicated. (16 points)
h) Fixtures. All fixtures shown on the floor plan are appropriately indicated on the isometric
drawing. (12 points)


November 6, 2023
6:30 pm - 9:00 pm
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