July 2026
IEC 60079-0 Edition 8, Wessex Water Charges, and a Hot-Work Explosion on a Sludge Vessel
IEC 60079-0:2026: Edition 8 of the General Requirements
The IEC published the eighth edition of IEC 60079-0, the general requirements document that every other Ex protection standard builds on, on June 16, 2026. It replaces the 2017 seventh edition. In July SGS published a summary of the changes for manufacturers. Most are minor for existing certified products, but several are not.
On marking and documentation, the ambient temperature range must now always be marked, even when it is the standard −20 °C to +40 °C, and the temperature range of an Ex component must appear in its schedule of limitations. IP marking is clarified, and there are new requirements for alternative marking using digital technology. Other changes cover electrostatic bonding of dissipative non-metallic enclosures, modified surface resistance testing, temperature sensors and shutdown for rotating machines with auxiliary cooling fans, instructions for converter-driven type "e" motors, factory wiring between enclosures, IP retention for plugs and sockets, and cable glands with multi-hole seals. Sodium nickel chloride is added to the permitted secondary cells.
For users, the most visible effect will be on nameplates, where the ambient range will always be shown, so there is less need to assume the default. For manufacturers, the practical question is timing. When new certificates must be issued to the 2026 edition depends on IECEx transition decisions and, in the EU, on when the EN version is cited in the Official Journal (see Ex standards, Ex markings and reading an ATEX nameplate).
Source: SGS, Jul 17 2026
Wessex Water to Face Charges Over the 2020 Avonmouth Explosion
On July 15 the UK Health and Safety Executive confirmed it had authorized criminal charges against Wessex Water under the Health and Safety at Work etc. Act 1974. The charges relate to the explosion at its Avonmouth wastewater treatment site in Bristol on December 3, 2020, which killed four people, including a 16-year-old apprentice. The explosion happened in a silo containing biosolids. Avon and Somerset Police had dropped a manslaughter investigation in July 2024.
HSE has not published a cause, and the case now goes to court. Nothing should be read into it about fault until then. For Ex practice, the relevance is the type of plant. Wastewater and biosolids sites handle material that can give off flammable gas and, once dried, can form combustible dust. That puts them squarely under DSEAR: a risk assessment, zone classification wherever an explosive atmosphere can form (including inside and above storage vessels), and control of ignition sources for any work carried out there (see also dust explosion protection).
Source: ITV News, Jul 15 2026
NTSB: Torch Used on Deck Ignited Gas From a Sludge Tank
The NTSB published its report on the May 24, 2025 explosion aboard the New York City sludge vessel Hunts Point, moored at the North River Wastewater Treatment Plant. Sludge gives off flammable gases, including methane. The crew needed to loosen sludge in the cargo tanks, but the pipe plugs on the cleaning hatch covers had seized, so the flanges were removed from the hatches. When some flange bolts broke, the chief engineer used a heating torch to free them. Gas coming out of the tank ignited, the tank over-pressurized, and the chief engineer was killed. Three other crew were injured, and the vessel suffered about $10 million in damage.
NTSB noted that once the flanges were off, nothing prevented an ignition source from reaching the gas leaving the tanks. The employer's policy treated torch use on deck as hot work requiring a permit, placards warned against open lights, and the master had warned the chief engineer twice. The training record showed no hot-work training, and the 2024 annual safety training did not cover hot work procedures or the gases produced by sludge.
The general lesson: opening a closed vessel creates a new source of release, so the hazardous area around the opening changes for as long as it is open. Hot-work permits, gas testing and isolation are the controls for that temporary condition (see maintenance activities requiring special attention and zone extent).
Source: WorkBoat, Jul 31 2026
NFPA 660: What the Consolidated Dust Standard Changed
A Safety+Health column by a Fike explosion safety consultant set out what NFPA 660 means in practice. NFPA 660, Standard for Combustible Dusts and Particulate Solids, took effect on December 6, 2024. It merged six documents (NFPA 61, 484, 652, 654, 655 and 664) into one. Chapters 1–10 are fundamentals that apply to every facility: hazard identification, the dust hazard analysis, management systems, prevention and mitigation, and a new chapter on emergency planning and response. Commodity chapters follow: 21 for agricultural and food, 22 for metals, 23 for sulfur, 24 for wood, and 25 for other dusts.
According to the article, the core requirements are largely unchanged, but they are renumbered and reorganized. "Management of change" is now defined, and a new operational readiness review (8.12) calls for a pre-startup review for new processes and for restarts after shutdowns. The next edition is expected in 2028. The first draft report is scheduled for October 28, and second draft public comments run until January 6.
NFPA 660 covers the dust hazard analysis, housekeeping and process protection. Electrical area classification for dust in the US still follows the NEC, with NFPA 499 as the recommended practice (see dust explosion protection and NEC 500 vs ATEX/IEC).
Source: Safety+Health, Jul 27 2026
Certified Inspection Robots and Fixed Acoustic Monitoring
In late June, UL Solutions issued the first certification under UL 6260, the Outline of Investigation for Remotely-Operated Inspection and Maintenance Equipment for Hazardous (Classified) Locations, to the ExRobotics ExR-2.5 inspection robot. In July its North American distributor, MicroWatt, launched the robot there. The North American rating given is Class I, Division 2, Groups C and D, T4. According to UL, the evaluation covered batteries, electrical systems and mechanical components under normal and fault conditions. The manufacturer separately states ATEX/IECEx Zone 1 certification for the platform.
In the same month, Sorama launched the L642Ex, a fixed acoustic monitor for Zone 1 areas certified by DEKRA on April 3, 2026. It is designed to detect and locate gas leaks, mechanical anomalies and partial discharge, and can be mounted on assets or carried on a robotic platform.
A practical point for users is that the Division 2 and Zone 1 ratings are different claims. A robot marked Class I, Division 2, Groups C and D is not suitable for Division 1 areas, or for Group B (hydrogen) areas, under the NEC. Check the marking against the classification of each area it will patrol (see NEC 500 vs ATEX/IEC, gas groups and EPL).
Source: EnergyNow, Jul 15 2026; Hydrocarbon Processing, Jul 7 2026
Flameproof Analyzer Enclosures as an Alternative to Purge
AMETEK Process Instruments added flameproof (Ex d) enclosures to its 993X and 9933 UV gas analyzers. They are certified to ATEX and IECEx for Zone 1 and rated IP66/NEMA 4X. The analyzers measure sulfur compounds such as Hâ‚‚S, carbonyl sulfide and methyl mercaptan in natural gas and biomethane, and sulfur species in sulfur recovery units. The stated purpose is to allow Zone 1 installation where purge gas is unavailable or impractical.
This is a common trade-off in analyzer design. Pressurization (Ex p) depends on a continuous supply of protective gas, plus monitoring and interlocks that act when pressure is lost. Flameproof enclosures (Ex d) need no utility, but the enclosure must contain an internal explosion. That means flame paths, fasteners and cable entries have to stay intact through every opening and inspection.
Source: Hydrocarbon Processing, Jul 7 2026
Events & Milestones
- IEC 60079-11:2023 Interpretation Sheet 6 (intrinsic safety) published July 23. The IEC lists Amendment 1 to the 2023 edition as under development, with forecast publication in October 2027
- Liushenyu coal mine, China: authorities widened the investigation into the May 22 gas explosion that killed 82 workers, and a senior provincial mine safety official was placed under investigation (Hazardex, Jul 23)