From Telecommunications Cabling Installation, Second Edition

Copper Cable


Intrabuilding splices are generally constructed in equipment rooms (ERs), telecommunications rooms (TRs), main terminals, entrance facilities (EFs), and cable trays. Cable splice locations and other splicing details are usually specified by the telecommunications distribution designer in work order prints. These work order prints must be strictly followed because the splicing work could affect future cabling system plans. Where questions arise concerning cable pair counts or specific splicing methods, seek direction from the immediate supervisor. For the purpose of this section, the cable splicing techniques described are for in-building applications using single sheath cable (yet to be activated) and fire-retardant 25-pair connector modules in a two-bank, in-line configuration.

Intrabuilding copper cable splicing is allowed only in backbone cable never for horizontal cable (horizontal cable extends between the TR and the work area [WA]). Backbone cables usually have expanded polyethylene-polyvinyl chloride (PVC) insulation and will normally be communications media riser (CMR) rated.

CMR cable consists of 24 AWG [0.51 mm (0.020 in)] copper conductors enveloped by a core wrap and an overall corrugated shield and may be bonded to a fire-retardant sheath. A fire-retardant sheath is required by the National Electrical Code (NEC ) to mitigate the spread of fire from floor to floor. The insulated cable, commonly known as plastic insulated conductor (PIC) cable, is designed for ease of cable pair identification. PIC cable is bundled in 25-pair color-coded binder groups with color-coded pairs in each binder (see colorcode chart in Table 7.1 for cable sizes up to 600 pairs).

Products & Services
Splice Kits
Splice kits are used to establish a connection between two cables.
Cable Laying Services
Cable laying services install fiber optic cable or copper cable in buildings and office complexes, or over large distances.
Cable Testers
Cable testers are handheld or benchtop electronic devices that measure the electrical and physical properties of network cabling.
Cable Bus Systems
Cable bus systems are used to transfer large amounts of power (very high current and voltage) between a power source and a load center. They are engineered systems that include cable trays, wireways, and conductors for connecting a power source to a machine. Unlike trays and wireways, cable bus systems are complete packages that include wiring or cabling.
Tool Kits
Tool kits contain different types and sizes of tools, often in a convenient carrying case.

Topics of Interest

Testing Cabling Overview Characterizing cabling provides useful data to identify the ability of the cabling system to support existing and future equipment applications. The verification of the...

Media Overview Telecommunications cabling installers must be aware of the various types of media (cable) that are available for installation and maintenance. Each type and configuration has specific...

OVERVIEW Multipair copper and optical fiber cables are installed for the backbone subsystem. Backbone communication cables are installed between telecommunications rooms (TRs) for voice, low-speed...

OVERVIEW Copper cables can be used for both horizontal and backbone media types. Large multipair UTP cables are used for backbone applications. Smaller, four-pair cables are installed for horizontal...

OVERVIEW Every communications cable installation project starts with precabling preparation. This process actually involves many different tasks. These can be divided into two general categories: ?...