Emerson Liebert Static Transfer Switch - Manual (Page 15)

Location Considerations
7
3.4 Altitude
The standard units are designed for full load operation up to 4000 feet (1200 m) above sea level. See
Figure 1 for recommended deratings for altitudes greater than 4000 feet (1200 m).
Figure 1 Recommended derating for high altitude operation
Operation at full load at a higher altitude can be accommodated in ambient temperatures less than
104°F (40°C) ambient. Figure 2 shows the maximum allowable ambient temperature for full load
operation at altitudes above 4000 feet (1200 m).
Figure 2 Maximum ambient temperature for full load operation at higher altitudes
0
10
,0
00
(304
8)
95
00
(289
6)
90
00
(274
3)
85
00
(259
1)
80
00
(243
8)
75
00
(228
6)
60
00
(182
9)
55
00
(167
6)
70
00
(213
4)
65
00
(198
1)
50
00
(1
524
)
45
00
(137
2)
40
00
(120
0)
100
86
88
90
92
94
96
98
Ra
tin
g
(%
)
Altitude, Feet (M) Above Sea Level
0
10,
00
0
(304
8)
950
0
(289
6)
900
0
(274
3)
850
0
(259
1)
800
0
(243
8)
750
0
(228
6)
600
0
(182
9)
550
0
(167
6)
700
0
(213
4)
650
0
(198
1)
500
0
(152
4)
450
0
(137
2)
400
0
(120
0)
104.0 (40)
86.0 (30)
87.8 (31)
94.1 (33)
93.2 (34)
95.0 (35)
96.8 (36)
98.6 (37)
Ma
xi
mu
m A
m
b
ie
n
t
Tem
per
at
ur
e,
°
F
(
°C
)
Altitude, Feet (M) Above Sea Level
102.2 (39)
100.4 (38)
89.6 (32)