Site Selection and Preparation
Installation Guidelines For 50 Hz Air-Cooled Generator Sets
17
Fire Prevention
The generator set must be installed at a safe distance
away from combustible materials. Engine, alternator, and
exhaust system components become very hot during
operation. Fire risk increases if unit is not correctly venti-
lated, is not correctly maintained, operates too close to
combustible materials, or if fuel leaks exist. Also, accu-
mulations of flammable debris within or outside the gen-
erator set enclosure may ignite.
Distance Requirements
See
. Minimum clearances must be main-
tained around generator set enclosure. These clearances
are primarily for fire prevention, but also to provide suffi-
cient room for removing front and end panels for mainte-
nance purposes.
Figure 3-2. Generator Set Distance Requirements
C
A
A
D
E
G
A
C
C
C
008782
F
B
ID
Description
Definition
A
Front and end
clearance
Minimum clearance from the front and ends of the generator set must be 0.91 m (3 ft). This
includes shrubs, bushes, and trees.
B
Rear clearance
Fuel and electrical connections are made here. 457 mm (18 in) minimum clearance per SwRI
testing, labeling, and listing, unless state or local codes dictate otherwise.
C
Windows, vents,
and openings
No operable windows, doors, vents, window wells, or openings in the wall are permitted near any
point of the generator set. See
for more information.
D
Existing wall
The generator set cannot be placed closer than 457 mm (18 in) from existing walls.
E
Removable fence
A removable barrier (non-permanent; without footings) installed as a visual surround.
Removable fence panels for servicing cannot be placed less than 0.91 m (3 ft) in front of the gen-
erator set.
F
Overhead clearance
1.52 m (5 ft) minimum distance from any structure, overhang, or projections from wall.
G
Maintenance and
servicing
Maneuvering space around generator set for performing routine maintenance tasks such as bat-
tery replacement and engine service. Do not attempt to conceal generator with shrubs, bushes, or
plants.See NEC Article 110.26 for more information.
