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protective earth cable and lightning protection earth cable, should be 0.5 times of
phase cable.
The relationship between the current and cross-sectional area is shown in Table 3-
2.
Name
Battery
Bypass
Output
Input
Neutral line
Earth cable
3.1.3 Selection of signal cables
Signal cables should use shielded multi-conductor cables. But if cable with single
conductor is used, the different cables should be bonded together to increase the
mechanical strength. The number of the bonded cables should not exceed 30. The
cross-sectional area of the cable with single conductor should be at least 0.5 sq-
mm. Serial communication cables should use 3 or 5 shielded conductor cables.
3.2 Cable connections
3.2.1 Power cables
1. Cabling layout
Cabling layout is shown in Figures 3-1 and 3-2. For single input UPS, the rectifier
input and bypass input are connected together.
Chapter 3 Electrical Assemble
Table3-2 Recommended cross sectional area of cables
20kVA
Current
Cable
Current
2
(A)
(mm
)
(A)
56
25
84
37
16
56
37
16
56
44
16
66
25
16
30kVA
40kVA
Cable
Current
2
(mm
)
(A)
25
112
16
74
16
74
16
88
25
16
24
60kVA
Cable
Current
Cable
2
(mm
)
(A)
(mm
35
168
50
25
112
35
25
112
35
25
132
35
35
50
25
25
2
)
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