System Cabling Rules

Attaching Cable Labels

A cable label must be consistent with the corresponding cabinet number.

Find the corresponding cable based on the wiring diagram in the cable fitting bag, and attach the corresponding cable label taken out from the cable fitting bag to both ends of the cable by wrapping the ends.

The cable labels must completely wrap the cable without wrinkles.

Attach the cable labels 20 mm away from the plug except for special circumstances. For example, a label shall not be attached to the bending part of a cable or attached in some positions that may affect cable installation. If a label conflicts with a cable tie, attach the label to the outer side of the cable tie.

Attach labels to both ends of a cable.

Requirements for Neatly Routing and Binding Cables

To route and bind cables in an appealing way, follow these rules:

1. Neatly organize exterior cables in a large bundle of cables and prevent cable tangles that are avoidable, as shown in Figure 4-48.
   Figure 4-48 Neatly organizing cables
   
2. Keep a large number of cables neat and appealing in a cabinet by using cable organizers. Move the excess parts of cables in unnoticeable positions, as shown in Figure 4-49.
   Figure 4-49 Cable organizer
   
3. Route and lay out a large number of cables in different areas to ensure neat cabling and facilitate cable search and maintenance.
4. Route several flat cables along the same path and then overlap them as one.
5. Arrange cables on distinct layers and prevent cable tangles that are avoidable when cables in different colors are bound together, as shown in Figure 4-50. Also comply with these rules when cables of different thickness are bound together. Arrange cables by thickness when arrangement by thickness conflicts with arrangement by color.
   Figure 4-50 Binding cables in different colors
   

Cable Spacing Requirements

Comply with the following requirements if possible to lay out different types of cables:

1. Separate AC and DC power cables from diverse non-shielded signal cables. Keep the cable spacing greater than 100 mm or use grounded metal for isolation purposes. Do not bind the cables together. Preferentially route the cables along different sides of cabinets.
2. You are advised to route network cables and optical cables separately.

Safety and Reliability Requirements for Routing and Binding Cables

1. Unless otherwise specified in a design file, ensure that the bend radius (R) of a cable meets the following requirements:

   • Common cable: R ≥ 3d
   • Optical cable: R ≥ 40 mm

   R indicates the bend radius, and d indicates the cable diameter.

2. Reserve slack at cable connection positions to facilitate connection and disconnection and to prevent stress. Do not leave the cables tight and prevent connector misalignment, as shown in Figure 4-51.
   Figure 4-51 Cable connection positions
   
3. Before installing a semi-flexible cable, use a dedicated tool to curve the cable. Do not curve the cable while holding the cable connector by hand.
4. If a number of wire terminals are connected to a multi-point connector, provide slack and arrange them neatly to prevent stress on certain wires, as shown in Figure 4-52.
   Figure 4-52 Cable connections
   
5. Protect cable holes in a metal kit with grommet strips. Alternatively, ensure that the holes are rounded, free from burrs or sharp edges.
6. Keep cables far away from heat sources such as radiators and heat vents. If unavoidable, take heat resistant measures.
7. Keep cables far away from operating components such as fan blades and do not bind cables to an airflow path of fans.
8. Prevent rotating components such as doors from squeezing or pulling cables.

Cable Binding Requirements

Bind cables reliably along the route and ensure that the binding interval meets the requirements in Table 4-7.

1. Bind cables with a moderate force and ensure that cables are not misshapen to prevent compromising the signal quality.
2. After binding cables, cut off the excess parts of cable ties and trim away any burrs, as shown in Figure 4-53.
   Figure 4-53 Cutting off the excess part of a cable tie
   
3. Do not use cable ties at a place where the cables are bent. Otherwise, the cable cores may break due to strong stress, as shown in Figure 4-54.
   Figure 4-54 Binding cables in a bending area
   
4. Ensure that the cable ties are wrapped and secured in the same direction and do not generate interference with subsequent operations, as shown in Figure 4-55.
   Figure 4-55 Direction for securing cable ties