Site Preparation; Generator Foundation; Concrete Pad; Dimensions - Generac Power Systems D2.5L G2 Installation Manuallines

Site Selection and Preparation

Site Preparation

Generator Foundation

Install the generator set on a concrete pad or base slab
able to support its weight and accessories. All applicable
codes should be followed. A proper foundation is needed
to resist dynamic loading and reduce transmitted noise
and vibration. The exact composition of the mounting pad
must follow standard engineering practices for the
required loading and application. Securely fasten the
generator set to the foundation using suitable grade,
size and style fasteners. Holes are provided in the base
frame for this purpose.

Concrete Pad

Follow all federal, state, and local codes when designing
a concrete pad or base slab.
Seat the concrete pad on a prepared solid subsurface
and use appropriate reinforcing bar or expanded wire
mesh. A common specification calls for 2500 psi (17.24
MPa) concrete reinforced with 8 gauge wire mesh.

Dimensions

Extend the concrete pad beyond the frame of the unit at
least six (6) inches (15.2 cm). This provides space for
maintenance and repair.
The base pad must be:
• Capable of supporting 125% of the unit wet weight
for single unit applications.
• Flat and level to within 1/2 inch (13 mm).
• Capable of withstanding severe torque reactions.
To calculate the depth of the concrete pad, the following
formula may be used:
Depth of Base =
W = Total wet weight of generator set in pounds (kg)
Density = Density of the concrete:
•150 pounds per cubic foot
•2400 kilograms per cubic meter
B = Foundation width in feet (meters)
L = Foundation length in feet (meters)
Suggested mixture of concrete (by volume) is 1:2:3 of
cement, sand, and aggregate with a maximum four inch
(100 mm) slump with a 28 day compression strength of
3000 psi (20.7 MPa).

Unit Clearance

Verify that the site provides easy access to the generator
set for maintenance, repair, and firefighting purposes.
Keep a minimum of 5 feet (1.5 m) of clearance around
each side of the generator set to facilitate service or
maintenance.
14
W
Density x B x L

Stub-Up Area

For load conduit, auxiliary power conduit (high voltage),
and control wiring conduit (low voltage), see the unit
installation drawings for the location and dimensions of
the stub-up area. Figure 3-1
opening.
1.9 (50)
3.9
(100)
Figure 3-1. Installation Drawing Stub-Up Detail
(Typical)
Installation Guidelines for Protector Diesel Generators
(A) illustrates a typical stub
In. (mm)
A
4.1 (104.5)
0.4 (9)
2.0 (51)
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