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Chapter 2
Installing the Device
Section 2.5
Cabling Recommendations
Siemens recommends using SIMATIC NET industrial Ethernet shielded cables for all Ethernet ports.
Section 2.5.1
Protection On Twisted-Pair Data Ports
Siemens does not recommend the use of copper cabling of any length for critical, real-time substation automation
applications. All copper Ethernet ports on RUGGEDCOM products include transient suppression circuitry
to protect against damage from electrical transients and conform with IEC 61850-3 and IEEE 1613 Class 1
standards. This means that during a transient electrical event, communications errors or interruptions may occur,
but recovery is automatic.
Siemens also does not recommend using copper Ethernet ports to interface with devices in the field across
distances that could produce high levels of ground potential rise (i.e. greater than 2500 V), during line-to-ground
fault conditions.
Section 2.6
Ingress Protection
IEC International Standard 60529 (Edition 2.1: 2001-02) is a "classification of degrees of protection provided
by enclosures as a system for specifying the enclosures of electrical equipment on the basis of the degree of
protection provided by the enclosure." These ratings are determined by specific tests.
The IP number is composed of two numbers, the first referring to the protection against solid objects and the
second against liquids. The higher the IP number, the better the protection. The following chart defines levels of
IP ratings.
Degree of protection against access to hazardous
1st IP#
parts & ingress of solid objects
0
No protection
1
Protected against solid foreign objects of 50 mm Ø and
greater
2
Protected against solid foreign objects of 12.5 mm Ø and
greater
3
Protected against solid foreign objects of 2.5 mm Ø and >
4
Protected against solid foreign objects of 1.0 mm Ø and >
5
Dust protected
6
Dust tight
16
2nd
Degree of protection against the ingress of water
IP#
0
No protection
1
Protected against vertically falling water drops
2
Protected against vertically falling water drops when
enclosure tilted up 15°
3
Protected against spraying water
4
Protected against splashing water
5
Protected against jet-water
6
Protected against strong jet-water
7
Protected against the effects of temporary submersion in
water
8
Protected against the effects of permanent submersion in
water
RUGGEDCOM RS969
Installation Guide
Cabling Recommendations
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