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Table 7.B
Minimum Transformer Wire Sizes – AWG (mm
Input Voltage
1.5
208V AC
#12 (2.5)
240V AC
#12 (2.5)
380V AC
#12 (2.5)
415V AC
#12 (2.5)
480V AC
#12 (2.5)
575V AC
#12 (2.5)
Important: The transformer primary requires protection by means of a
customer supplied branch circuit disconnect device. Refer to Appendix B.
Fusing (Transformer Primary)
Time delay fusing similar to Bussman Fusetron FRS Series or equivalent
must be used if the primary circuit is fused. Circuit breakers must provide
protection equivalent to fuses.
Fuse ratings shown in Table 7.C are the highest ratings allowed in a 25 C
(77 F) ambient temperature. Higher electrical enclosure ambient
temperatures will require fuses with higher current ratings. Consult fuse
manufacturer's derating data. Fuses larger than those listed below may
result in transformer damage.
Table 7.C
Fuse Current Rating – Amperes
Primary Voltage
1.5
208V AC
8
240V AC
7
380V AC
4.5
415V AC
4
480V AC
3.5
575V AC
3
External Shunt Regulator Resistor
The external Shunt Regulator Resistor and fuse for the 45A 1391-DES
must be connected to TB5-8 and TB5-9 as described in Chapter 10.
22.5A drives must be converted for use with an external shunt resistor and
fuse. Refer to Chapter 10 and Appendix B for detailed instructions.
Interface Connections
Refer to Chapter 5 and Appendix B for connection information.
Chapter 7
Installation
2
)
kVA
3.5
5.0
10.0
#12 (2.5)
#12 (2.5)
#8 (6)
#12 (2.5)
#12 (2.5)
#8 (6)
#12 (2.5)
#12 (2.5)
#10 (4)
#12 (2.5)
#12 (2.5)
#12 (2.5)
#12 (2.5)
#12 (2.5)
#12 (2.5)
#12 (2.5)
#12 (2.5)
#12 (2.5)
kVA
3.5
5.0
10.0
12.5
17.5
20
40
50
15
20
35
45
9
12
25
30
8
12
20
25
7
10
17.5
25
6
8
15
20
12.5
15.0
#8 (6)
#6 (10)
#8 (6)
#8 (6)
#10 (4)
#8 (6)
#10 (4)
#10 (4)
#10 (4)
#10 (4)
#12 (2.5)
#10 (4)
15.0
60
50
35
30
30
25
7-7
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