The crankcase breather tube (fig. 3-4) is clamped to
the engine breather assembly. The breather tube
provides a path for engine crankcase vapors to exit the
generator set. A rain shield is provided at the tube outlet
to prevent rain from entering the tube when the
generator is used outdoors.
The generator set must be connected to a suitable
ground before operation.
Electrical faults in the generator set, load
lines, or load equipment can cause injury or
electrocution from contact with an ungrounded
The ground can be, in order of preference, an
underground metallic water piping system (fig. 3-5,
view A), a driven metal rod (fig. 3-5, view B), or a
buried metal plate (fig. 3-5, view C). A ground rod must
have a minimum diameter of 5/8 inch (41 mm) if solid
or 3/4 inch (44 mm) if pipe. The rod must be driven to a
minimum depth of 8 feet (2.44 M). A ground plate must
have a minimum area of 2 square feet (0.186 square
meter) and, where practical, be embedded below the
permanent moisture level.
The ground lead must be at least No. 6 AWG
(American Wire Gauge) copper wire. The lead must be
bolted or clamped to the rod, plate, or piping system.
Connect the other end of the ground lead to the
generator set ground terminal stud (fig. 3-6, view A).
Use the following procedure to install ground rods:
1. Install the ground cable into the slot in the
ground stud and tighten the nut against the cable.
2. Connect a ground rod coupling to the rod and
install the driving stud in the coupling (fig. 3-6, view B).
Make sure that the driving stud is bottomed on the
3. Drive the ground rod into the ground until the
coupling is just above the ground surface.
4. Connect additional rod sections, as required, by
removing the driving stud from the coupling and
installing another rod section in the coupling. Make
sure the new ground rod section is bottomed on the
ground rod section previously installed. Connect
another coupling on the new section and again install
the driving stud.
Figure 3-5.Methods of grounding generators.