WIMES Compliance & Duct Sealing: Why Our Products Lead the Way

WIMES (Water Industry Mechanical and Electrical Specification) sets mandatory technical standards for mechanical and electrical equipment used in UK water infrastructure.

Its primary goal is ensuring consistency, safety, and reliable operation across water treatment, pumping, and distribution systems.

Why WIMES Matters

If you're specifying or installing equipment in wastewater treatment plants (WWTW), pumping stations, or other water sector installations, compliance isn’t optional.

Many water authorities in the UK follow WIMES, including Thames Water, Severn Trent, Yorkshire Water, Welsh Water, United Utilities, and others.

Our Commitment to WIMES Standards

At AC Cable Solutions, our duct sealing systems are engineered and verified to meet or exceed WIMES requirements. We guarantee that all our products:
- Are gas and watertight to at least 1 bar pressure
- Resist corrosion or degradation in field conditions
- Conform to WIMES 3.02 – Clause 6.4.3.2 for electrical installations in hazardous area zones

Where Duct Seals Are Critical

Cable ducts must be sealed at various critical zones, including:
- Electrical control rooms
- Motor Control Centres (MCCs)
- Instrumentation and monitoring panels
- Pumping stations and substations
- Communication hubs and UV treatment units

By sealing these penetrations, we prevent water ingress, protect sensitive electronics, and maintain the operational integrity of the site.

WIMES 3.02 – Clause 6.4.3.2 Approved Methods

The clause specifies that duct seals can be:
(A). Water, gas & fire sealing with modular inserts
(B). Sleeve systems with or without fire-retardant functionality
(C). Expanding resin seals (not really used anymore)
(D). Flexible interlocking foam inserts + silicone sealant

Our product range fits directly into these approved categories:

DuctSeal HG

➡️ WIMES Clause 6.4.3.2 (B) — Sleeve Systems (Non-Fire Rated)

- For non-fire-rated applications (water & gas protection only)
- Up to 2 bar resistance to water, gas, and air
- Circular backing tubes can be split, joined, or compressed for multiple cable layouts
- MEKO-free, FyBrid, neutral-curing sealant — safe and non-hazardous
- Fully compliant with DSEAR, WIMES, ATEX, DCG, APEA Blue Book
- Resistant to microbial growth
- Made in the UK

DuctSeal FR

➡️ WIMES Clause 6.4.3.2 (B) — Modular Inserts with Fire Resistance

- Provides up to 4 hours fire integrity (tested to BS EN 1366-3:2021)
- Intumescent technology expands under heat to close pathways
- Low smoke, zero halogen, non-toxic in fire scenarios
- Suitable for LV, MV, and HV cable penetrations
- Combines water/gas sealing with fire protection

DuctSeal LG

➡️ WIMES Clause 6.4.3.2 (D) — Flexible Foam Inserts + Sealant

- Interlocking foam tubes combined with GreyStuff sealant
- Up to 1 bar water and gas resistance
- Ideal for projects where fire resistance is not mandatory
- Chemical, hydrocarbon, and gas resistant
- Flexible, adaptable, and easy to retrofit on site
- MEKO-free, safe, and long-lasting

Why Choose Our WIMES-Compliant Seals?

- Specified and approved by multiple UK and Irish water authorities
- Designed for longevity in harsh water industry environments
- Fully documented with test data available for compliance checks
- Made in Britain / Made in Germany – ensuring consistent supply and quality

✅ Whether you need non-fire-rated duct seals (HG, LG) or fire-rated solutions (FR), our range aligns perfectly with WIMES Clause 6.4.3.2 — giving you confidence in compliance, performance, and long-term reliability.