Installation guide

Network Infrastructure for EtherNet/IP™

Designing the Infrastructure

4-39

continuity along its entire length. It also must be bonded to the enclosure at the entry

point.

For more information on general wiring guidelines, see Industrial Automation Wiring and Grounding

Guidelines

and the Telecommunications Industry Association publication ANSI/TIA/EIA-607,

Grounding and Bonding Requirements.

4.4.5 Wiring External to Enclosures

Cables that run outside protective enclosures may be relatively long. To minimize cross-talk from nearby

power lines, it is good practice to maintain maximum separation between the Ethernet cable and other

potential noise conductors. The following guidelines should be followed for routing network cables near

potential noise-inducing cables.

Within a contiguous metal wire-way or conduit

• Category 1 conductors of less than 20 amps: maintain a 0.08-meter (3-in.) separation

distance.

• AC power lines of 20 amps or more, up to 100 KVA: maintain a 0.15-meter (8-in.)

separation distance.

• AC power lines greater than 100 KVA: maintain a 0.3-meter (12-in.) separation distance.

In open-air cabling systems

• Category 1 conductors of less than 20 amps: maintain a 0.15-meter (8-in.) separation

distance.

• AC power lines of 20 amps or more, up to 100 KVA: maintain a 0.3-meter (12-in.)

separation distance.

• AC power lines greater than 100 KVA: maintain a 0.6-meter (24-in.) separation distance.

Local, regional, and national codes regarding the grouping of cables should also be followed. In the

absence of these codes, the general rule for noise protection is a minimum distance of 7.6 cm (3 in.) from

electric light and power conductors and an additional 2.5 cm (1 in.) for each 100 volts over the 100-volt

level. See Table 4-9 for outside wiring recommendations.

Rockwell Automation, Industrial Automation Wiring and Grounding Guidelines. Publication 1770-4.1. Milwaukee: Rockwell

Automation, 1998.

http://literature.rockwellautomation.com/

TIA-J-Std 607-A, Commercial Building Grounding (Earthing) and Bonding Requirements for Telecommunications.

http://retail.ihs.com/abstracts/tia/tia-j-std-607a.jsp