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The GHG 64 Ex-d series of explosion-proof enclosures from Cooper Crouse-Hinds can be tailored to suit hazardous areas, including onshore oil refineries, offshore oil platforms and chemicals plants.

The GHG 64 is a compact, flameproof, copper-free aluminium electrical equipment enclosure with a wide temperature range from -20C to +40C (-55C to +55C option also available.

Eleven different sizes of enclosures are available, from 210 x 210 x 191mm, up to 650 x 650 x 442mm.

They can be installed in hazardous gas (Ex-d IIB or optional Ex-d IIB +H2) or hazardous dust (tD) areas.

Rated voltage is up to 690V and rated current is up to 1,150A.

The GHG 64 can be interconnected using flameproof bushings, which enables large, complex customised solutions to be assembled.

Cooper Crouse-Hinds can also provide a variety of integrated control systems and devices, such as contactors, MCBs, RCDs, PLCs, WLAN, time elements, electronic components and terminals – all housed within a space-saving, fully assembled and protected Ex-d enclosure.

Customers can also choose from a range of optional fittings, including a display window, frameworks for wall and floor mounting, a special hinged cover with up to 110deg opening angle, as well as a selection of cable entry systems (Ex-d and Ex-e from CEAG and Capri).

Even if the customer needs to mount the enclosures directly adjacent to one another, special stainless steel hinges can be fitted to the units by Cooper Crouse-Hinds that enable the enclosure door to be pulled out and swung open at an angle of up to 110deg.

Once the captive screws are removed, the enclosure cover can be swung open easily due to spring-mounted pull-turn hinges.

The flat flamepath is also protected against damage.

‘This saves installation space and also simplifies maintenance work and speeds up the repair and replacement of built-in components,’ said Daniel Eichart, global product line manager – switchgear at Cooper Crouse-Hinds.

An optional display window can be embedded in the enclosure housing, enabling the user to monitor the display and switch states of built-in components.

This eliminates the cost of sourcing additional, explosion-protected indicators for the enclosure.

The GHG 64 is protected to IP65.

However, this can be upgraded to IP66 by fitting an optional lip seal made from a highly heat-resistant, weather-resistant silicone.

This gasket system also prevents the ingress of aggressive particles and other foreign matter into the Ex-d flame path, providing long-term corrosion protection and improved safety.

In addition, using the IP66 version of the GHG 64 enclosure system results in prolonged maintenance intervals, according to Cooper Crouse-Hinds.

Enclosures with lip seals can therefore be installed in extreme environments where moisture, saltwater, chemicals and dust are present.

This includes offshore oil and gas platforms, marine applications, harsh industrial conditions, and dusty environments such as flour, sugar and saw mills.

The high heat-dissipation rating of the GHG 64 enclosure means a high degree of flexibility for the customer in terms of which standard industrial components can be safely housed within the Ex-d enclosure.

The permissible limiting temperature values are therefore higher with the GHG 64, which saves installation space and provides more flexibility during the planning stage.

Cooper Crouse-Hinds has also adapted its Ex-e connection and busbar boxes to suit the new modular GHG 64 enclosures.

This means a wide range of electrical distribution connections are possible with currents of up to 1,150A.

Busbar boxes are available in Ex-e and Ex-d designs.

Rugged Ex-e enclosures made from powder-coated sheet steel or stainless steel can be adapted to the modular system.

Ex-d enclosures are made from die-cast aluminium alloy.

Busbar rails can be used to connect multiple enclosures.

As well as busbar connections and boxes, Cooper Course-Hinds can also supply a range of cover-mounted components direct from the factory.

Threaded Ex-d holes can be incorporated into the GHG 64 cover in order to accommodate a variety of screw-in components such as rotary switches, pushbuttons, name plates, padlocking mechanisms, signal lamps, windows, and actuators for circuit breakers.

The modular concept of the GHG 64 series means that the customer can combine the reliable safety of an explosion-protected enclosure with the benefits of a continuous communications infrastructure between the main, control and process levels of a plant.

For example, Ethernet-based communications systems can be installed in hazardous areas.

In the process industries, wireless communications are also growing in popularity.

Working with sister company MTL, Cooper Crouse-Hinds is able to provide customers with complete wireless communications solutions for hazardous areas, including wireless gateways for Profibus, Modbus, RS232 and 485.

GHG 64 Ex-d and Ex-e enclosures have already been implemented in several customer applications.

For example, a custom-engineered, Ex-wireless LAN system was developed for an oil and gas customer based in Germany.

The system records vibrations from machines in hazardous areas via wireless LAN.

Wireless vibration sensors monitor the critical points on the machines directly and measurement data is then transmitted via wireless LAN connection to a computer located in a GHG 64 enclosure.

The system can also monitor machines on a permanent basis in order that maintenance activities can be scheduled in time.

In another application, a series of GHG 64 electrical power distribution panels have been delivered to an offshore gas exploration field in the Gulf of Thailand.

Cooper Crouse-Hinds

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