Cooper Crouse-Hinds EYS1/EZS1 ATEX Conduit Sealing Fittings

Name: Crouse-Hinds EYS1/EZS1 Conduit Sealing Fittings – Datasheet
Brand: Cooper Crouse-Hinds

Description

Overview

The Cooper Crouse-Hinds (Eaton) EYS and EZS Series conduit sealing fittings are explosionproof/flameproof seals engineered to stop the propagation of an internal explosion along a conduit run in Zone 1 and Zone 2 hazardous locations. The EYS1 (vertical or horizontal mounting) and EZS1 (any-angle mounting) restrict the passage of gases, vapors and flames from one section of an electrical installation to another, and they limit the pre-compression, or “pressure piling,” that can otherwise build inside a conduit system during a fault event. Certified to Ex II 2 G Ex d IIC under EC-type examination certificate LOM 03 ATEX 2108, and rated IP67 per EN 60529, these fittings are a core part of any Ex d conduit-and-wiring installation feeding motors, junction boxes, luminaires or instrumentation in refineries, gas plants, offshore platforms and petrochemical facilities.

Seven Star LLC supplies the EYS and EZS Series as a trusted regional supplier for Cooper Crouse-Hinds (Eaton) equipment across Oman and the wider GCC. For EPC contractors and plant maintenance teams in Muscat, Sohar, Duqm and Salalah, ordering a certificate-matched sealing fitting in good time removes a common cause of hazardous-area installation delay – waiting on an overseas shipment for a single conduit seal. Our technical team can confirm the correct EYS or EZS size and hub configuration against your conduit schedule and Ex certificate of conformity before you order.

Measurement and Operating Principle

An EYS1 or EZS1 fitting does not measure a process variable; it performs a passive explosion-isolation function within the conduit and cabling system. The fitting body has one or more threaded hub openings sized to the conduit or cable entry, and an open top through which an installer packs fiber damming material around the conductors and then pours a two-part sealing compound. Once cured, the compound forms a solid, gas-tight plug that occupies the full internal cross-section of the fitting. Should an explosive gas mixture inside the conduit be ignited by an internal arc or spark, the seal contains and cools the resulting flame front and expanding gases before they can travel onward through the conduit to a non-hazardous area or to another enclosure containing a different explosive atmosphere.

The distinction between the EYS and EZS bodies lies in mounting orientation, not sealing principle. EYS and EYSA fittings are intended for installation in either the vertical position only, or in both horizontal and vertical positions, depending on the specific catalog variant, while EZS fittings are designed for installation at any angle – the cover opening used to pour the compound can be rotated and positioned correctly regardless of how the conduit run approaches the fitting. Both series use integral bushings inside the conduit hubs to protect conductor insulation from abrasion, and taper-tapped hub threads to maintain reliable ground continuity across the joint, which is essential for equipotential bonding in a classified area.

Engineering Design and Construction

EYS and EZS bodies, plugs and nipples are manufactured from light-alloy copper-free aluminum with a natural finish, giving a strong, corrosion-resistant casting suited to coastal and marine-influenced sites such as those found throughout Oman’s Batinah coast and Duqm free zone. The fitting incorporates large threaded closures over the pouring opening, giving installers clear access to the conduit hub for building the fiber dam and pouring compound cleanly, then resealing the opening once the compound has cured. Minimum turning radius geometry keeps the fitting compact enough to install in congested cable tray and conduit runs without compromising the internal volume needed for an effective seal.

Every EYS and EZS fitting installed as part of a Cooper Crouse-Hinds (Eaton) hazardous-area system is selected to match the gas group, temperature class and ingress protection rating specified on the area classification drawing for the installation. IP67 protection per EN 60529 ensures the fitting resists dust ingress and temporary immersion, relevant for fittings mounted at grade or in wash-down areas of an LNG, refining or desalination facility. Because the fitting is a certified Ex component, Seven Star LLC only supplies genuine Cooper Crouse-Hinds product with full ATEX/IECEx documentation, allowing the fitting to be correctly reflected in the plant’s hazardous-area equipment register and inspection records.

EYS1 and EZS1 Key Features

EYS1/EZS1 is Ex II 2 G Ex d IIC certified under EC-type examination certificate LOM 03 ATEX 2108
EYS1/EYSA for vertical-only or horizontal-and-vertical mounting; EZS1 for installation at any angle
IP67 ingress protection rating per EN 60529 for outdoor and wash-down duty
Restricts flame and pressure-piling propagation between hazardous-area conduit sections
Large threaded pour openings for straightforward fiber damming and sealing-compound installation
Integral hub bushings protect conductor insulation from mechanical damage
Taper-tapped hub threads maintain ground continuity across the conduit joint
Light-alloy copper-free aluminum construction resists corrosion in coastal and offshore environments

Industrial Applications

EYS1 and EZS1 conduit sealing fittings are installed wherever a conduit crosses a hazardous-area boundary, enters an explosionproof enclosure, motor terminal box, junction box or luminaire, or where local code requires a seal within a specified distance of the enclosure entry. Typical installations include upstream and downstream gas processing trains, crude and product storage terminals, offshore platform topsides, LNG liquefaction and regasification facilities, and petrochemical process units where Zone 1 or Zone 2 classification applies to motor control, instrumentation and lighting circuits.

As a trusted Cooper Crouse-Hinds (Eaton) supplier, Seven Star LLC supports EPC contractors, panel builders and plant maintenance departments across Oman and the GCC with correctly specified EYS and EZS fittings, matched compound and damming material, and technical guidance on seal placement relative to enclosure entries and area boundaries.Seven Star LLC supplies this item on request with the manufacturer documentation, and availability and lead time are confirmed at quotation.

EYS1/EZS1 Technical Specifications

Model	EYS1 / EZS1 Conduit Sealing Fitting
Manufacturer	Cooper Crouse-Hinds (Eaton)
Type of Protection	Ex II 2 G Ex d IIC
Certificate	LOM 03 ATEX 2108
Ingress Protection	IP67 per EN 60529
Mounting	EYS1: vertical or horizontal/vertical; EZS1: any angle
Body Material	Light-alloy copper-free aluminum, natural finish
Hub Threading	Taper-tapped for ground continuity
Application	Conduit sealing at hazardous-area boundaries and enclosure entries

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About brand

Crouse-Hinds is the American brand of explosion-proof and hazardous-area electrical equipment: Condulet conduit bodies, explosion-proof enclosures, control stations, plugs and receptacles, lighting and cable glands. Huntington B. Crouse and Jesse L. Hinds founded the company in Syracuse, New York, on 18 January 1897; its first product was a changeable headlight for trolley cars. Crouse-Hinds became part of Cooper Industries in 1981 and has been an Eaton brand since Eaton acquired Cooper in 2012.

Seven Star LLC sources and supplies Cooper Crouse-Hinds conduit fittings, sealing fittings, junction boxes, pushbutton stations and receptacles for plants in Oman, checking each catalog number against the manufacturer's documentation. Current production is sold as Eaton's Crouse-Hinds series, so either name may appear on the part you are replacing.

Cooper Crouse-Hinds company profile

Founded	18 January 1897, Syracuse, New York, USA
Founders	Huntington Beard Crouse and Jesse Lorenzo Hinds
First product	A changeable headlight for trolley cars
Ownership	Cooper Industries from 1981; Eaton since 2012 (Eaton's Crouse-Hinds series)
Product families	Condulet conduit outlet bodies and fittings, EFS and N2S control stations, GUB and EJB explosion-proof boxes, flexible couplings, plugs and receptacles, hazardous-area lighting, cable glands

Milestones

1897: Crouse and Hinds sign their partnership in Syracuse on 18 January.
1920s: The company moves into traffic signals and installs Syracuse's first traffic light in 1924.
1981: Crouse-Hinds becomes part of Cooper Industries.
2012: Eaton acquires Cooper Industries and keeps the Crouse-Hinds brand.

Cooper Crouse-Hinds product families listed here

The catalog numbers on this page follow the manufacturer's own series names:

Condulet conduit outlet bodies, such as the Form 8 C28 and the Form 5 LB25
EYS conduit sealing fittings (EYS3, EYS5) and ECGJH flexible couplings
GUB and GUE explosionproof junction boxes, and the box listed as GUP315
EDS and EFS explosionproof control stations and N2S non-metallic, factory-sealed stations
Arktite receptacles, for example the 30 A AR342

Where Crouse-Hinds explosionproof equipment is used

Most of these parts belong to rigid conduit systems in classified areas: refinery units, gas compression and metering stations, tank farms, loading racks, paint and solvent handling, and offshore modules across the GCC. The listed series are built around the North American Class and Division system, but the rating differs by item: N2S stations are marked for Class I, Division 2, and the AR342 receptacle is a watertight type for ordinary locations. A Cooper Crouse-Hinds junction box or control station should therefore be selected against the area classification drawing, not by enclosure size alone.

Cooper Crouse-Hinds products we list

Family	Examples
Automation Accessories	EDS225 EDS Pushbutton Control Station, EFSC215 EFS Explosionproof Pushbutton Control, EJB Series Explosionproof Custom-Built, GUB01 SA Explosionproof Junction Box, GUE Series Explosionproof Junction Box, GUP315 Explosionproof Junction Box, N2PS1111 N2S Non-Metallic Factory-Sealed, N2S2210 N2S Non-Metallic Factory-Sealed
Pipes & Fittings	C28 Condulet Form 8 Conduit Outlet, ECGJH24 GJH Flexible Coupling, EYS1/EZS1 ATEX Conduit Sealing Fittings, EYS3 EYS Conduit Sealing Fitting, EYS5 EYS Conduit Sealing Fitting, LB25 Condulet Form 5 Conduit Outlet Body
Electrical Tapes & Cable Accessories	AR342 Arktite Receptacle 30A 3-Wire 4-Pole

Ordering Cooper Crouse-Hinds parts: what we need

Send the full catalog number from the nameplate or the casting, including every suffix. For conduit bodies and seals, add the hub size and thread, and state the material, iron alloy or copper-free aluminum. For control stations, list the operators, contact blocks and legend plates. For receptacles, give the amperage, the number of wires and poles, and the mating plug. A nameplate photo and the area classification let us confirm the match before quoting.

Facts checked against published histories of the Crouse-Hinds Company and Eaton, October 2026.

Browse Cooper Crouse-Hinds products by category: Automation Accessories, Pipes & Fittings, Electrical & Power Modules.

FAQ

Questions about the Cooper Crouse-Hinds EYS1/EZS1 ATEX Conduit Sealing

Answers from our engineering team on installation, compatibility and integration.

01What is the difference between the EYS1 and EZS1 conduit sealing fittings?

The EYS1 is designed for vertical-only or combined horizontal/vertical mounting, while the EZS1 can be installed at any angle because its pour-opening cover can be repositioned after mounting.

02Can Seven Star LLC supply EYS and EZS fittings in Oman?

Yes. As a trusted Cooper Crouse-Hinds (Eaton) supplier for Oman and the GCC, Seven Star LLC supplies on request and can advise on correct sizing against your area classification drawing.

03What sealing compound is used with the EYS1/EZS1?

A two-part Crouse-Hinds sealing compound is poured over a fiber dam packed around the conductors inside the fitting; Seven Star LLC can supply matched compound and damming material with the fitting.

04Is the EYS1/EZS1 suitable for offshore and coastal installations?

Yes. The copper-free aluminum body and IP67 rating make it suitable for coastal and offshore environments such as those along Oman's Batinah coast and Duqm free zone.

05Can Seven Star LLC provide a quotation for a full conduit sealing schedule?

Yes. Contact our technical sales team with your conduit schedule and area classification drawing and we will prepare a matched EYS/EZS quotation with certificate documentation.