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The table below shows the line-to-ground voltages in relation to the line-to-line voltage
for each grounding 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
70 Electrical installation – IEC
Summary of Contents for ACS480-04-09A8-1
Page 1: ... ABB GENERAL PURPOSE DRIVES ACS480 drives Hardware manual ...
Page 2: ......
Page 4: ......
Page 14: ...14 ...
Page 22: ...22 ...
Page 28: ...28 ...
Page 38: ...38 ...
Page 44: ...44 ...
Page 118: ...118 ...
Page 126: ...126 ...
Page 174: ...174 ...
Page 176: ...Frame R0 Frame R0 front side IP20 UL open type 176 Dimension drawings ...
Page 177: ... Frame R0 bottom rear IP20 UL open type Dimension drawings 177 ...
Page 178: ...Frame R1 Frame R1 front side IP20 UL open type 178 Dimension drawings ...
Page 179: ... Frame R1 bottom rear IP20 UL open type Dimension drawings 179 ...
Page 180: ... Frame R1 front side UL Type 1 kit installed 180 Dimension drawings ...
Page 181: ... Frame R1 bottom rear UL Type 1 kit installed Dimension drawings 181 ...
Page 182: ...Frame R2 Frame R2 front side IP20 UL open type 182 Dimension drawings ...
Page 183: ... Frame R2 bottom rear IP20 UL open type Dimension drawings 183 ...
Page 184: ... Frame R2 front side UL Type 1 kit installed 184 Dimension drawings ...
Page 185: ... Frame R2 bottom rear UL Type 1 kit installed Dimension drawings 185 ...
Page 186: ...Frame R3 Frame R3 front side IP20 UL open type 186 Dimension drawings ...
Page 187: ... Frame R3 bottom rear IP20 UL open type Dimension drawings 187 ...
Page 188: ... Frame R3 front side UL Type 1 kit installed 188 Dimension drawings ...
Page 189: ... Frame R3 bottom rear UL Type 1 kit installed Dimension drawings 189 ...
Page 190: ...Frame R4 Frame R4 front side IP20 UL open type 190 Dimension drawings ...
Page 191: ... Frame R4 bottom rear IP20 UL open type Dimension drawings 191 ...
Page 192: ... Frame R4 front side UL Type 1 kit installed 192 Dimension drawings ...
Page 193: ... Frame R4 bottom rear UL Type 1 kit installed Dimension drawings 193 ...
Page 194: ...194 ...
Page 221: ... Declarations of conformity The Safe torque off function 221 ...
Page 231: ...Dimensions BIO 01 I O extension module 231 ...
Page 232: ...232 ...
Page 238: ...Dimensions 3AXD50000031148 rev A 238 BREL 01 relay output extension module ...