Siemens SINAMICS G130 Engineering Manual page 443

With symmetrical 3-wire, three-phase cables, the summed ampere-turns over the cable outer diameter are
o
equal to zero and they can be routed in conductive, metal cable ducts or racks without any significant
currents (ground current or leakage current) being induced in these conductive, metal connections. The
risk of induced leakage currents and thus increased cable sheath losses is significantly higher with single-
conductor cables.
The required cable cross-section depends on the amperage which flows through the cable. The permissible current
loading of cables is defined, for example, in IEC 60364-5-52. It depends partly on ambient conditions such as
temperature and partly on the routing method. An important factor to consider is whether cables are routed singly and
are therefore relatively well ventilated, or whether groups of cables are routed together. In the latter case, the cables
are not ventilated so well and might therefore heat up one another to a greater degree. Reference is made to the
corresponding correction factors for these boundary conditions in IEC 60364-5-52. For 3-wire copper and aluminum
cables with PVC insulation and a permissible conductor temperature of 70 °C (e.g. Protodur NYY or NYCWY), as
well as an ambient temperature of 40 °C, the cross-sections can be determined from the information provided in the
following table, which is based on IEC 60364-5-52.
Cross-section
Single routing
of
3-wire cable
2
[mm ]
3 x 2.5
3 x 4.0
3 x 6.0
3 x 10
3 x 16
3 x 25
3 x 35
3 x 50
3 x 70
3 x 95
3 x 120
3 x 150
3 x 185
3 x 240
1)
A maximum of 9 cables may be routed directly next to one another horizontally on a cable tray
Current-carrying capacity of PVC-insulated 3-wire copper and aluminum cables with a maximum permissible conductor
temperature of 70 °C at an ambient temperature of 40 °C according to IEC 60364-5-52
Cables must be connected in parallel for higher currents.
The maximum connectable cable cross-sections for the line connection on the Line Connection Modules and for the
motor connection on the Motor Modules are stated in the technical specifications in Catalog D 21.3. The
recommended cable cross-sections for the motor connection are identical to those for the SINAMICS S150 converter
cabinet units, which can be found in section "Cable cross-sections and connections on SINAMICS S150 cabinet
units" in chapter "Converter Cabinet Units SINAMICS S150".
Note:
The recommendations for the North American market in AWG or MCM must be taken from the appropriate NEC
(National Electrical Code) and/or CEC (Canadian Electrical Code) standards.
The PE conductor must be dimensioned to meet the following requirements:
· In the case of a ground fault, no impermissibly high contact voltages resulting from voltage drops on the PE
conductor caused by the ground fault current may occur (< 50 V AC or < 120 V DC, IEC 61 800-5-1, IEC 60 364,
IEC 60 543).
· The PE conductor must not be excessively loaded by any ground fault current it carries.
· If it is possible for continuous currents to flow through the PE conductor when a fault occurs, then the PE cross-
section must be dimensioned for this continuous current.
· The PE conductor cross-section must be selected according to EN 60 204-1, EN 60 439-1, IEC 60 364.
Copper cable
Groups of cables
routed in parallel
[A]
[A]
22 17
30 23
37 29
52 41
70 54
88 69
110 86
133 104
171 133
207 162
240 187
278 216
317 247
374 292
SINAMICS S120 Cabinet Modules
Engineering Information
Single routing
1)
[A]
17
23
29
40
53
68
84
102
131
159
184
213
244
287
SINAMICS Engineering Manual – November 2015
Aluminum cable
Groups of cables
routed in paralle l
[A]
13
18
22
31
41
53
65
79
102
124
144
166
190
224
443/528
Ó Siemens AG
1)