Switchboard & Intercom Cable
Electro-tinned solid copper switchboard and intercom cable aligned with TEC GR/WIR-06/03 (supersedes G/WIR-06/02) for PABX wiring, intercom, hotel room drops, and low-voltage signalling. Designed for IDC / Krone-style punch-down blocks.
Technical Data
General Indoor Riser / switchboard wire for internal wiring in exchange equipment rooms, PABX racks, and intercom head-ends. For tenders, the active TEC reference is TEC GR/WIR-06/03 (supersedes G/WIR-06/02).
| Designation | Conductor dia (mm) | Pairs | OD approx (mm) | DC resistance (Ω/km) at 20°C | Primary use |
|---|---|---|---|---|---|
| Primary Stock Range (0.5 mm Conductor) | |||||
| 0.5 mm · 1-pair | 0.5 | 1 | 4.0 | 92.2 | Room telephone drop |
| 0.5 mm · 2-pair | 0.5 | 2 | 5.0 | 92.2 | Standard extension + earth |
| 0.5 mm · 5-pair | 0.5 | 5 | 6.0 | 92.2 | Small PABX riser |
| 0.5 mm · 10-pair | 0.5 | 10 | 8.0 | 92.2 | MDF Distribution backbone |
| Specialized Project Range (Made-to-Order) | |||||
| 0.6 mm build | 0.6 | 1-20 | 6.0-18.0 | 64.0 | High-density exchange runs |
| 0.9 mm build (custom) | 0.9 | 2-10 | 7.0-16.0 | 28.4 | Long-distance analog loops |
| Formal GR for bid documentation: TEC GR/WIR-06/03 (supersedes G/WIR-06/02). Primary stock build (0.5 mm solid): DC resistance 92.2 Ω/km at 20°C per TEC GR/WIR-06/03 Table-1. The 0.6 mm build (64.0 Ω/km per TEC Table-1) is made to order; the 0.9 mm build (28.4 Ω/km, IEC 60228 solid) is a custom variant outside TEC GR Table-1 scope. Conductor sizes in 0.1 mm increments (not AWG). | |||||
| Parameter | 0.6 mm build | 0.9 mm build (custom) | Reference |
|---|---|---|---|
| Conductor material | Electro-tinned solid copper (annealed base) | ASTM B33 · IS 8130:2013 | |
| DC resistance per conductor (max) | 64.0 Ω/km at 20°C | 28.4 Ω/km at 20°C | IEC 60228 |
| Insulation resistance (min) | 50 MΩ/km corrected to 50°C (500 V dc, 1 min electrification) | TEC GR/WIR-06/03 cl. 12.6.1 | |
| Test voltage (withstand) | 3 kV DC or 2 kV AC (rms, 50 Hz), 1 minute | TEC GR/WIR-06/03 cl. 12.4.1 | |
| Insulation material | High-grade low-capacitance PVC — pair colours per CW1308 logic | IEC 60189-2 | |
| Outer sheath | PVC — grey (indoor) | IS 5831:1984 Type ST1 | |
Cable Construction
Switchboard and intercom cable uses electro-tinned solid copper conductors with low-capacitance PVC insulation and pair twisting for voice and low-speed data transmission.
Cable Advantages
Each property below is the result of a specific manufacturing decision — electro-tinning, low-capacitance insulation, pair twisting. Verified on every production lot.
Applications
Switchboard and intercom cable is specified for PABX internal wiring, hotel telephone systems, intercom networks, and low-voltage signalling circuits.
Standards this product is manufactured to.
National Cables Switchboard & Intercom Cable is manufactured to TEC GR/WIR-06/03 (supersedes G/WIR-06/02) with electro-tinned copper conductors per ASTM B33. Full documentation available for institutional procurement and government tenders.
Switchboard and intercom cable — technical questions answered.
Common questions from telecom contractors, residential developer procurement teams, building services specifiers, and intercom system integrators selecting cable to TEC/ITD specification.
Does this cable comply with TEC/ITD specifications?
Yes. Our switchboard and intercom cable is manufactured to Telecommunication Engineering Centre specification TEC/ITD G/WIR-06/02 (historically) and its republished successor GR/WIR-06/03. The TEC specification covers conductor construction, insulation, pair formation, optional screening, marking, and electrical testing for internal switchboard and intercom applications in Indian telecom infrastructure.
For procurement documentation, always quote the TEC requirement number alongside conductor diameter and pair count.
Is the switchboard cable shielded for audio interference?
Standard switchboard and intercom cable to TEC/ITD specification is typically unscreened with twisted-pair construction for basic crosstalk reduction. Screening is optional under the TEC specification and must be specified at order if required — when specified, it uses aluminium tape screen with a tinned copper drain wire.
For environments with high electromagnetic interference (near VFDs, large motors, or radio equipment), specify a screened variant or select a dedicated shielded telecom cable.
Does the cable design reduce crosstalk between pairs?
Yes. Twisted-pair construction is the primary engineering mechanism for reducing crosstalk between adjacent circuits. The TEC/ITD specification requires pair lay lengths selected to minimise inductive coupling between pairs.
This pair geometry, combined with the colour-coded identification system, maintains adequate signal separation for voice-frequency telephone circuits in multi-pair building telecom applications. For high-interference environments, a screened variant provides additional protection against external electromagnetic coupling.
What are the standard conductor sizes for intercom cable?
Indian telecom and switchboard cable to TEC specification typically uses 0.4mm, 0.5mm, or 0.6mm solid copper conductors, with 0.5mm being the most common for internal building intercom and switchboard applications.
Conductor size affects loop resistance and maximum reliable run length for voice-frequency transmission. For longer runs or specific system requirements, consult your intercom equipment manufacturer's cable specification. Always specify exact conductor diameter at order rather than relying on the generic "intercom cable" designation.
Request institutional pricing and technical documentation.
PABX fit-outs, hotel telephone projects, and government EPABX supply. Tell us your pair count, conductor size, approximate quantities, and project timeline.
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