Planning the electrical installation
43
Requirements table
The following table shows how to select the motor insulation system and when an optional ABB du/dt
filter, insulated N-end (non-driven end) motor bearings and ABB common mode filters are required. The
motor manufacturer should be consulted regarding the construction of the motor insulation and
additional requirements for explosion-safe (Ex) motors. Failure of the motor to fulfil the following
requirements or improper installation may shorten motor life or damage the motor bearings and voids
the warranty.
Manufacturer
Motor type Nominal mains
voltage (AC line
voltage)
Requirement for
Motor
insulation
system
ABB du/dt filter, insulated N-end bearing and ABB common
mode filter
P
N
< 100 kW
and
frame size < IEC
315
100 kW < P
N
<
350 kW or
frame size >
IEC
315
P
N
> 350 kW
or
frame size >
IEC
400
P
N
< 134 HP
and frame size <
NEMA 500
134 HP < P
N
<
469 HP
or frame size >
NEMA 500
P
N
> 469 HP
or frame size >
NEMA 580
A
B
B
Random-
wound M2_
and M3_
U
N
< 500 V Standard - + N + N + CMF
500 V < U
N
< 600 V Standard + du/dt + du/dt + N + du/dt + N + CMF
or
Reinforced - + N + N + CMF
600 V < U
N
< 690 V Reinforced + du/dt + du/dt + N + du/dt + N + CMF
Form-wound
HX_ and
AM_
380 V < U
N
< 690 V Standard n.a. + N + CMF P
N
< 500 kW: + N
+CMF
P
N
> 500 kW: + N
+ CMF + du/dt
Old* form-
wound HX_
and modular
380 V < U
N
< 690 V Check with the
motor
manufacturer.
+ du/dt with voltages over 500 V + N + CMF
Random-
wound HX_
and AM_ **
0 V < U
N
< 500 V Enamelled wire
with fibre glass
taping
+ N + CMF
500 V < U
N
< 690 V + du/dt + N + CMF
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