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The table below shows the line-to-ground voltages in relation to the line-to-line voltage
for each earthing system.
Electrical power system type
UL3-G
UL2-G
UL1-G
UL-L
Symmetrically grounded TN system (TN-S
system)
0.58·X
0.58·X
0.58·X
X
Corner-grounded delta system (nonsymmet-
rical)
0
1.0·X
1.0·X
X
Midpoint-grounded delta system (nonsym-
metrical)
0.5·X
0.5·X
0.866·X
X
IT systems (ungrounded or high-resistance-
grounded [>30 ohms]) nonsymmetrical
Varying level
versus time
Varying level
versus time
Varying level
versus time
X
TT system (the protective earth connection
for the consumer is provided by a local
earth electrode, and there is another inde-
pendently installed at the generator)
Varying level
versus time
Varying level
versus time
Varying level
versus time
X
Connecting the power cables – North America (wiring in
conduits)
Use insulated wires suitable for the installation in electric conduits. See the National
Electric Code and Local ordinances.
Note:
ABB prefers the use of a symmetrical shielded motor cable (VFD cable).
94 Electrical installation – North America
Содержание ACH480
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Страница 156: ...Frame R1 Frame R1 front side IP20 UL open type 156 Dimension drawings ...
Страница 157: ... Frame R1 bottom rear IP20 UL open type Dimension drawings 157 ...
Страница 158: ... Frame R1 front side UL Type 1 kit installed 158 Dimension drawings ...
Страница 159: ... Frame R1 bottom rear UL Type 1 kit installed Dimension drawings 159 ...
Страница 160: ...Frame R2 Frame R2 front side IP20 UL open type 160 Dimension drawings ...
Страница 161: ... Frame R2 bottom rear IP20 UL open type Dimension drawings 161 ...
Страница 162: ... Frame R2 front side UL Type 1 kit installed 162 Dimension drawings ...
Страница 163: ... Frame R2 bottom rear UL Type 1 kit installed Dimension drawings 163 ...
Страница 164: ...Frame R3 Frame R3 front side IP20 UL open type 164 Dimension drawings ...
Страница 165: ... Frame R3 bottom rear IP20 UL open type Dimension drawings 165 ...
Страница 166: ... Frame R3 front side UL Type 1 kit installed 166 Dimension drawings ...
Страница 167: ... Frame R3 bottom rear UL Type 1 kit installed Dimension drawings 167 ...
Страница 168: ...Frame R4 Frame R4 front side IP20 UL open type 168 Dimension drawings ...
Страница 169: ... Frame R4 bottom rear IP20 UL open type Dimension drawings 169 ...
Страница 170: ... Frame R4 front side UL Type 1 kit installed 170 Dimension drawings ...
Страница 171: ... Frame R4 bottom rear UL Type 1 kit installed Dimension drawings 171 ...
Страница 172: ...172 ...
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Страница 198: ... Declaration of conformity 198 The Safe torque off function ...
Страница 206: ...Dimensions 206 BIO 01 I O extension module ...
Страница 212: ...Dimensions 3AXD50000031148 rev A 212 BREL 01 relay output extension module ...