Layout Guidelines
The following layout guidelines are necessary for proper operation of each NCR device on an Ethernet communications network.
| • | Cables should not be routed in cable trays (Walker ducts) with AC power wiring. |
| • | Unless grounded metallic conduit is used, the minimum space between the communication cable and fluorescent, neon, incandescent light bulbs, is 30 cm (1 ft). |
| • | Unless grounded metallic conduit is used, the minimum space between the communication cable and electrical equipment and associated power lines, is as shown in the following chart. |
|
Maximum Rated Circuit |
Power Cables |
|
|---|---|---|
|
|
Unshielded |
Shielded |
|
1 kVA |
30 cm (1.0 ft) |
2.5 cm (1.0 in.) |
|
2 kVA |
46 cm (1.5 ft) |
5.1 cm (2.0 in.) |
|
5 kVA |
61 cm (2.0 ft) |
15.2 cm (6.0 in.) |
|
>5 kVA |
152 cm (5.0 ft) |
30.5 cm (12.0 in.) |
If the communication cable is routed through an elevator shaft, it must be enclosed in grounded metallic conduit.
| • | Each link is for use within a single structure. Cable routing outside of, or between buildings, is not supported. |
| • | Appropriate cable strain relief must be provided. |
| • | Avoid severe bending or kinking of the communication cable (not less than 3.7 " radius for coax cable, 1.0 " for twisted pair). |
| • | All connections must be secure. Loose or faulty connections degrade the system performance. |
| • | Hubs must not be setup in any loop configuration. Do not create a situation where a loop is created by a connection of a Header Hub's out jack to a Low Order Port, or a sequence of hubs where High Order to Low Order ...High Order to Low order is created. This can cause a constant jammed link (a feed-back loop.) |
| • | Do NOT work while network is live. |
| • | Look for potential short at Wall Boxes. Correct before bring-up of Network and test for continuity. |
Conduit Requirements
Communication cable must not be installed in conduit that contains power cables.
Communication cables must be run through conduit under certain conditions (See Layout Guidelines), including the following:
| • | When required by local electrical or labor codes |
| • | When wiring would otherwise be exposed to physical damage or abuse |
Greenfield flexible metallic shield and rigid metallic pipe are acceptable. Copper conduit must not be used.
Conduit must be connected to earth ground, at a single point, as close to the primary device as possible. It must be large enough to accommodate the present cables, plus any cables to be added later.