Siemens SINAMICS S120 - Page 388

SINAMICS S120 Cabinet Modules
Engineering Information
SINAMICS Engineering Manual – November 2015
Ó Siemens AG
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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 on ambient conditions such as the
temperature, but also 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 instance, the
cables are much less well ventilated and might therefore heat one another to a greater degree. For the relevant
correction factors applicable to these boundary conditions, please refer to IEC 60364-5-52. The table below provides
a guide to the recommended cross-sections (based on IEC 60364-5-52) for PVC-insulated, 3-wire copper and
aluminum cables, a permissible conductor temperature of 70°C (e.g. Protodur NYY or NYCWY) and an ambient
temperature of 40°C.
Cross-section
of
3-wire cable
[mm
2
]
Copper cable Aluminum cable
Single routing
[A]
Groups of cables
routed in parallel
1)
[A]
Single routing
[A]
Groups of cables
routed in paralle l
1)
[A]
3 x 2.5 22 17 17 13
3 x 4.0 30 23 23 18
3 x 6.0 37 29 29 22
3 x 10 52 41 40 31
3 x 16 70 54 53 41
3 x 25 88 69 68 53
3 x 35 110 86 84 65
3 x 50 133 104 102 79
3 x 70 171 133 131 102
3 x 95 207 162 159 124
3 x 120 240 187 184 144
3 x 150 278 216 213 166
3 x 185 317 247 244 190
3 x 240 374 292 287 224
1)
Maximum 9 cables routed horizontally in direct contact with one another on a cable rack
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
With higher currents, cables must be connected in parallel.
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 data in Catalog D21.3. 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)/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 protective 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, the PE conductor
cross-section must be dimensioned for this continuous current.
· The PE conductor cross-section should be selected according to EN 60 204-1, EN 60 439-1, IEC 60 364.
Cross-section of the phaseconductor
mm
2
Minimum cross-section of the external PE conductor
mm
2
Up to 16 Minimum phase conductor cross-section
16 to 35 16
35 and above Minimum half the phase conductor cross-section