IEC 61156-14:2025

Overview

IEC 61156-14:2025 is an international sectional specification for symmetrical single pair cables intended for work area wiring. It defines cables with transmission characteristics up to 20 MHz and is aimed at supporting 10 Mb/s over a single twisted pair in channel distances up to 1 km. Performance is specified at 20 °C and the document covers both unscreened and screened constructions depending on MICE environment and installation conditions. Two product classes are defined: A-1000W (designed to support up to 1 km without attenuation de-rating relative to IEC 61156-13 A-1000) and A-400W (which includes attenuation de-rating relative to IEC 61156-13 A-400). A blank detail specification is provided in Annex A.

Key topics and technical requirements

The standard specifies mechanical, electrical and environmental characteristics and associated tests, including:

• Electrical tests: conductor resistance, resistance unbalance, dielectric strength, insulation resistance, mutual capacitance and capacitance unbalance.
• Transmission parameters: attenuation (to 20 MHz), velocity of propagation/phase delay, impedance, return loss, and attenuation temperature coefficients.
• Crosstalk and coupling: transfer impedance, low-frequency coupling attenuation, unbalance attenuation (TCL and EL TCTL), and alien crosstalk metrics (PS ANEXT, PS AACR‑F).
• Mechanical and dimensional: conductor and insulation tensile/elongation, sheath properties, bending radius, crush/impact, repeated bending and tensile performance.
• Environmental: thermal ageing, cold bend, heat shock, damp heat, UV/solar radiation, solvent resistance, salt mist/sulphur dioxide, water immersion, flame propagation, halogen gas evolution, smoke and toxic gas tests.
• Powering considerations: cables are intended for voltages/currents typical in communications and to support DC low-voltage remote powering (not intended for public mains low‑impedance sources).

Applications

IEC 61156-14:2025 is targeted at work area wiring scenarios requiring long-reach single-pair links (up to 1 km) and predictable performance up to 20 MHz. Typical uses include:

• Long-distance single-pair data links in buildings and industrial facilities
• Work area cabling where low-frequency performance, immunity and environmental robustness are required
• Deployments that require optional screening depending on electromagnetic and mechanical conditions
• Systems that need DC low-voltage remote powering support (PoDL-like applications), not mains power

Who should use this standard

• Cable manufacturers and product designers specifying single-pair cables
• Test laboratories and compliance engineers verifying electrical/mechanical characteristics
• Network designers, systems integrators and specifiers for long-reach work area installations
• Procurement teams and certification bodies referencing a blank detail specification (Annex A)

Related standards

• IEC 61156-13 (reference for A-400 / A-1000 classes and attenuation comparisons)
• Annex A (blank detail specification) for product procurement and type approval

Keywords: IEC 61156-14, symmetrical single pair cables, work area wiring, 20 MHz, 1 km, A-1000W, A-400W, screened/unscreened, transmission characteristics, MICE environment, low-voltage remote powering.