Category IEC Standards

In extra-high-voltage (EHV) and ultra-high-voltage (UHV) transmission networks, circuit-breakers rely on multiple interrupter units connected in series to handle the enormous recovery voltages that follow fault clearing. Without intervention, the voltage distribution across these series-connected interrupters would be highly uneven…

The explosive growth of data centre bandwidth and fibre-to-the-x (FTTx) deployments has driven an equally explosive proliferation of optical transceiver form factors — SFP, SFP+, SFF, QSFP, QSFP-DD, OSFP, and more. Without standardised interfaces, each manufacturer’s module would require a…

While IEC 62148 ensures that fibre optic transceivers fit mechanically into host systems, IEC 62149 answers the critical question: does this module actually work at the required performance level across its intended operating range? The IEC 62149 series defines performance…

The reliability of optical communication networks depends on the ability to accurately and reproducibly measure the performance of active optical components. IEC 62150 provides the standardised test and measurement procedures that make this possible. While IEC 62148 defines the package…

As the world grapples with the dual challenge of energy security and climate change, fossil-fired steam power stations remain a cornerstone of global electricity generation despite the rapid expansion of renewables. IEC 62140, published by the International Electrotechnical Commission under…

In nuclear power plants, instrumentation and control (I&C) systems are classified into safety categories based on their importance to safety. IEC 62141 provides the software lifecycle and verification requirements specifically for computer-based systems performing category B safety functions. These are…

Lightning strikes pose one of the most severe natural threats to buildings, industrial facilities, and critical infrastructure. An effective lightning protection system (LPS) is only as strong as its individual components — air terminals, down conductors, earth electrodes, and connecting…

Modern railway operations depend critically on the reliable functioning of onboard signalling and telecommunications equipment. Unlike passenger comfort systems or traction drives, signalling and communication systems must maintain functionality under the most extreme environmental conditions a train can encounter —…

International Standard | Edition 1.0 | Published 2009-06 | TC 86/SC 86B 📋 Introduction and Scope IEC 62134-1:2009 provides a comprehensive framework for the reliability assessment of fibre optic interconnecting devices and passive components — including connectors, splices, attenuators, couplers,…

International Standard | Edition 2.0 | Published 2015-05 | TC 26 📋 Introduction and Scope IEC 62135-1:2015 specifies safety requirements for the design, manufacture, and installation of resistance welding equipment. This includes spot welding machines, seam welders, projection welders, butt…