INFICON T3000 Thermal Power Supply - Manual (Page 20)

instruments Thermal Power Supply T3000
Section 2 Page 2 - 9 Installation
NOTICE
The front and rear of the unit should be free of obstructions to airflow. Proper ventilation
must be maintained, regardless of mounting or orientation.
2.4 Wire
Sizing
Care must be taken to properly size all conductors for the input and output of the power
supply. Table 2.4-1 gives minimum recommended wire size for different current levels and
operating temperatures. This table is derived from the National Electrical Code and is for
reference only. Local laws and conditions may have different requirements. The table is for
copper wire only.
Table 2.4-1 Minimum Wire Size Table
COPPER WIRE CURRENT CAPACITY
Single wire in open air, ambient temperature 86
o
F
Ampacities of Wire Types (w/ Temp Rating) @ 0-2000 Volts
Wire
Size
AWG
TW
UF
(140
o
F)
FEPW, RH, RHW, THW,
THWN, ZW,
THHW, XHHW
(167
o
F)
USE-2, XHH, XHHW, -2, TA,
TBS, SA, SIS, FEP
MI, RHW-2, THHN, ZW-2,
THWN-2, FEPB, RHH,
THHW, THW-2
(194
o
F)
0000
000
00
0
1
2
3
4
300
260
225
195
165
140
120
105
360
310
265
230
195
170
145
125
405
350
300
260
220
190
165
140
Ambient Ampacity Correction for above Wire types
Temp o F 140 o F 167 o F 194 o F
96-104
105-113
114-122
123-131
132-140
141-158
159-176
0.82
0.71
0.58
0.41
- - -
- - -
- - -
0.88
0.82
0.75
0.67
0.58
0.35
- - -
0.91
0.87
0.82
0.76
0.71
0.58
0.41