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interfaces and problems your crew may
encounter during the job.
The working sketch is something a crew
should have with them while working. It
can show them how, what, when, and where
things happen in the sequence of a job.
Your first step in making a working sketch
is to draw the symbols that represent all the
fixtures to be installed and locate them
within the room. Try to draw them in the
sequence of installation and include
measurements. Now draw the piping for hot
and cold water, show where it comes from
and where it is going. Include pipe sizes,
fittings, hanging requirements, and rough-in
measurements. Do the same for the sanitary
and vent systems.
The amount of detail you should use in a
working sketch is determined by the crew’s
experience, the complexity of the system involved,
and the need for interface with other trades
working on the jobsite.
Working sketches are also useful to simplify
complicated electrical schematics when you are
installing or servicing mechanical equipment, such
as air conditioners and boilers. Figure 4-10 shows
electrical symbols commonly found on electrical
schematics. By understanding what these
electrical symbols represent, you will be able to
translate the manufacturer’s schematics.. B y
drawing a simplified working sketch of this
information, you are aiding your crew in
installing and troubleshooting the equipment.
Figure 4-10.—Electrical symbols.
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