ABB PQFA Instruction Manual page 30

- If the cable section found is bigger than the previously found value, step 2
and 3 have to be repeated until the cable sections are equal (see example
below).
Remark: during this process, it can be found that more than one cable per
phase is needed. The process has then to be applied on each cable as shown
in the example n°3 below.
S e c t i o n
S e c t i o n
2
[mm ]
16
25
35
50
70
95
120
150
185
240
300
Table: Multiplication factors for different cable types
Examples:
Please note that the following examples are given for information only
(see important remark above).
Example n°1:
PQF-L 80A 480V 60hz
= 80A ? cable section (*) = 25 [mm
Step 1: I
N
Step 2: multiplication factor for a 25 [mm
Step 3: I = I x 1.03 = 80A x 1.03 = 83 A
N
Step 4: I = 83A ? cable section (*) : 25 [mm
This section is equal to the section found in the previous step.
Result : one copper cable of 25 [mm
50Hz
Al Cu
1.01 1.01
1.01 1.02
1.02 1.03
1.03 1.06
1.05 1.1
1.08 1.16
1.11 1.30
1.16 1.30
1.22 1.41
1.31 1.55
1.41 1.70
2
Asea Brown Boveri Jumet S.A.
PQFA Instructions Manual
60Hz
Al Cu
1.01 1.01
1.01 1.03
1.02 1.04
1.04 1.08
1.06 1.13
1.10 1.21
1.15 1.30
1.21 1.39
1.28 1.50
1.40 1.66
1.52 1.84
2
]
2
] copper cable at 60hz = 1.03
2
]
] per phase
30