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Conduit Shielding
227
Appendix C
Recommended Wiring Methods
Conduit Shielding
Conduit and cable trays route the network trunkline within the plant for short
distances or for several miles. Often the same conduit carries both data and power
wiring, creating a problem with electromagnetic interference. Your choice of
materials and configuration for the cable conduit determines the degree of
protection from this interference.
For detailed information on raceway shielding for conduits and trays, refer to
IEEE
Standard 518-1982
,
Guide for the Installation of Electrical Equipment to Minimize
Electrical Noise Inputs to Controllers from External Sources
.
Cable Spacing
You should separate noise-creating sources (those with time-varying voltage or
time-varying current) from data signal cables as much as possible. Group cables
with similar levels of noise susceptibility together. Group cables with similar levels
of noise generation together in trays and conduit.
IEEE defines four classes of wiring that differ in signal level and noise
susceptibility:
IEEE Class
Definition
Data 1
High-noise susceptibility
Includes analog signals of less than 50 V and digital signals of less
than 15 V
Data 2Medium-noise susceptibility
Includes analog signals greater than 50 V and switching circuits
Data 3
Low-noise susceptibility
Includes the following:
• Switching signals greater than 50 V
• Analog signals greater than 50 V
• Regulating signals of 50 V with currents less than 20 A
• Feeders less than 20 A
Power
AC and DC buses of 0 – 1000 V with currents of 20 - 800 A
Содержание Trident
Страница 1: ...Trident Version 1 2 Triconex An Invensys Company Planning and Installation Guide ...
Страница 10: ...x Contents Trident Planning and Installation Guide ...
Страница 16: ...xvi Training Trident Planning and Installation Guide ...
Страница 53: ...Main Processor Module 37 Chapter 3 System Description Model 2101 Main Processor Baseplate ...
Страница 63: ...Communication Module 47 Chapter 3 System Description Model 2201 Communication Module Baseplate ...
Страница 106: ...90 Input Output Modules Trident Planning and Installation Guide Model 2401 Digital Output Baseplate ...
Страница 128: ...112 Input Output Modules Trident Planning and Installation Guide Model 2451 Solid State Relay Output Baseplate ...
Страница 140: ...124 Covers Trident Planning and Installation Guide ...
Страница 145: ...Guidelines 129 Chapter 4 Installation and Maintenance Depth Dimensions for Baseplate and Module ...
Страница 216: ...200 Replacing Modules Trident Planning and Installation Guide ...
Страница 238: ...222 Diagread Cables and Debug Connectors Trident Planning and Installation Guide ...
Страница 240: ...224 Trident Planning and Installation Guide ...
Страница 248: ...232 Trident Planning and Installation Guide ...
Страница 264: ...248 Glossary Trident Planning and Installation Guide ...
Страница 274: ...258 Index Trident Planning and Installation Guide ...