Ex 32A wall-mounted sockets

Mechanical lock for plugs in Ex sockets

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The challenge

Pulling the plug out whilst electricity is flowing may cause an electric arc. Where flammable gases, vapours or dust are present in the air, such an arc poses a real ignition hazard.

How it works

HSP1P 32 W-SCT sockets prevent the plug from being removed whilst the circuit remains live.

• the plug is inserted into the socket,
• Turning it activates the internal switch,
• in the operating position, the plug is locked in place,
• Only when it is returned to the ‘off’ position can it be released.

Impact on the user

• lower risk of disconnection under load,
• elimination of the risk of an electric arc,
• a mandatory, safe operating procedure,
• longer service life of the contacts,
• a genuine improvement in workplace safety.

Integrated circuit breaker – Ex-rated industrial sockets

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The challenge

In conventional systems, the plug contacts may make contact with the socket contacts whilst the circuit is live, and the operator does not always know whether current is flowing at that moment.

How it works

In HSP1P 32 W-SCT sockets, the circuit breaker is linked to a locking mechanism. It is only activated when the plug is rotated – simply inserting it does not close the circuit. It is the position of the plug that determines the state of the socket and decides whether it can be removed.

Impact on the user

• predictable, controlled activation,
• not having a separate switch at the socket,
• intuitive, straightforward operation,
• reduction in the number of live-line operations.

It is worth bearing in mind that the built-in circuit breaker does not exempt you from the obligation to use appropriate installation protection measures – short-circuit and overload protection.

Lock to prevent the plug from being removed whilst under load

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The challenge

Sometimes, the operator disconnects the device without first switching off the power supply, which accelerates wear on the contacts, generates an electric arc and increases the risk of ignition in an Ex zone.

How it works

In HSP1P 32 W-SCT sockets, the removal of the plug is physically linked to the state of the switch – the plug is released only once the circuit has been switched to the off position.

Impact on the user

Safety is no longer dependent solely on the operator’s discipline – the design of the socket itself prevents dangerous actions from being carried out.

Safe connection of equipment in an Ex zone – instructions

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Procedure

• rated current,
• voltages,
• the number and arrangement of contacts,
• markings indicating explosion-proof construction,
• permissible temperature,
• the diameter and cross-section of the cable.

Before making the connection, check that the socket and plug are compatible in terms of:

1. Check that the socket is switched off.
2. Fit the correct plug.
3. Block the call.
4. Turn the plug to the ‘on’ position.
5. When you have finished, switch it to ‘off’.
6. Unlock and pull out the plug.
7. Secure the socket with a protective cover.

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A single solution for gas and dust zones

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The challenge

Gas explosion hazard zones and dust zones may co-exist within the plant premises, which, when separate equipment systems are used, complicates the design and maintenance of the installations.

How it works

The HSP1P 32 W-SCT sockets support:

• Zones 1 and 2 – gases, vapours, mists,
• Zones 21 and 22 – combustible dusts and fibres.

Explosion-proof designations for the series:

• II 2G Ex db eb IIC T5 Gb,
• II 2D Ex tb IIIC T80°C Db.

Suitable for use with gases in Groups IIA, IIB and IIC, and dusts in Groups IIIA, IIIB and IIIC.

Impact on the user

• a uniform standard for equipment throughout the plant,
• simplified spare parts inventory management,
• a smaller number of different plug-in systems,
• more effective training for maintenance teams.

Ex-rated sockets for the chemical and refining industries

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The challenge

In chemical and petrochemical plants and refineries, electrical equipment must be able to withstand explosive atmospheres, moisture, corrosive vapours, temperature fluctuations and heavy-duty use.

How it works

The HSP1P 32 W-SCT sockets combine:

• explosion-proof design for gases and dusts,
• a casing made of anti-static BMC reinforced with glass fibre,
• IP66 protection rating,
• silicone seals that are resistant to ageing and high temperatures,
• a mechanical lock on the plug,
• integrated switch,
• a wide range of operating temperatures.

They work well for

• power supply for service equipment,
• repair workstations,
• technological equipment,
• pumps and agitators,
• heaters,
• measuring equipment,
• auxiliary systems,
• equipment used during stops.

ATEX sockets for mobile and service equipment

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The challenge

Portable devices are connected and disconnected repeatedly, which increases the risk of operator error, accelerated wear of the contacts and accidental disconnection of the cable during operation.

How it works

The HSP1P 32 W-SCT sockets enable the safe power supply of compatible mobile equipment in Ex zones.

Mechanical lock:

• ensures a stable connection,
• eliminates the risk of the plug being pulled out accidentally,
• forces the circuit to be switched off before disconnection,
• reduces the risk of an electric arc.

The self-cleaning contact sleeve also removes some of the contaminants each time a connection is made.

Applications include, amongst others, power supply for:

• portable pumps,
• fans,
• measuring equipment,
• renovation tools,
• Ex-rated units and process equipment,
• mobile service equipment.

32 A explosion-proof sockets

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The available versions of the HSP1P 32 W-SCT sockets with a rated current of 32 A are listed below.

Contact configurations

• 2P,
• 3P – 2P + PE,
• 3P – 1P + N + PE,
• 4P – 3P + PE,
• 4P – 3P + PE + NO,
• 5P – 3P + N + PE,
• 5P – 3P + N + PE + NO.

An additional NO contact, depending on the version, can be used for signalling, control or monitoring the connection status.

The available variants include AC voltages up to 690 V AC and DC voltages up to 250 V DC.

Protection against incorrect plug selection

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The challenge

A single installation may contain sockets with different voltages, rated currents and intended uses, and connecting them incorrectly may result in damage to the appliance or pose a hazard.

How it works

The HSP1P 32 W-SCT system is based on several parallel safety mechanisms.

Colour-coding of voltages

The colour-coding of the socket and plug components makes it easy to quickly identify the voltage range and minimises the risk of incorrect connection.

However, this is merely an indicative figure – the rating plate must always be checked separately.

Current protection

A plug rated for a different current rating will not physically fit into a socket of a different design.

Protection against non-Ex equipment

The design of the socket eliminates the risk of connecting a standard industrial plug that is not suitable for use in an Ex zone.

Impact on the user

• fewer voltage-related errors,
• the possibility of connecting components with incompatible current ratings is ruled out,
• protection against the use of standard industrial equipment,
• easier identification of circuits by staff.

How do you choose an explosion-proof socket to match a plug?

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The starting point is always an analysis of the parameters of the device being powered.

1. Rated current

It must comply with the circuit specifications and those of the connected load.

2. Voltage

Check the device’s rated voltage and the system’s colour coding – the colour alone is no substitute for checking the rating plate.

3. Number and arrangement of contacts

Indicate whether the following are required:

• two contacts,
• two terminals and PE,
• phase, neutral conductor and PE,
• three phases and PE,
• three phases, neutral and PE,
• an additional NO auxiliary contact.

4. Ex Zone

The equipment’s marking must comply with the classification of the installation site, the gas or dust group, and the required temperature class.

5. Ambient temperature

The maximum permissible value depends on the variant, the cable cross-section and the temperature class.

6. Cable

Please note:

• core cross-section,
• outer diameter,
• the number of cores,
• temperature resistance of the insulation,
• type of gland,
• the need to use a reinforced cable.

7. Customer service

The plug is connected by turning it.

IP66 sockets for outdoor use

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The challenge

Equipment installed outdoors is exposed to rain, snow, dust, damp, condensation and fluctuating temperatures.

How it works

The IP66 protection rating of the HSP1P 32 W-SCT sockets effectively protects the interior against dust and powerful jets of water.

Silicone seals are resistant to:

• low temperatures,
• high temperature,
• ageing processes,
• changeable weather conditions.

Once the plug has been removed, the socket must be covered with a protective cap – effective protection of the entire installation also depends on the correct fitting of cable glands and end caps.

Impact on the user

• can be easily installed outdoors
• effective protection against water and dust,
• less impact of the weather on the condition of the contacts,
• a lower risk of moisture penetrating into the interior.

However, the IP66 rating does not mean that the device is designed for continuous immersion or for water jets to be deliberately directed at an open socket.

Resistance to corrosion and low temperatures

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The challenge

In outdoor, marine, chemical and process installations, equipment is regularly exposed to low temperatures, moisture and corrosive agents.

How it works

The housing is made from glass-fibre-reinforced, antistatic BMC polyester resin, which ensures:

• the corrosion resistance typical of metal enclosures,
• high mechanical strength,
• thermal stability,
• good insulating properties,
• suitability for use in a demanding industrial environment.

Operating temperature range: from -45°C to +60°C.

Impact on the user

• operation in outdoor installations without restrictions,
• suitable for use in cold climates and unheated buildings,
• fewer problems caused by corrosion of the housing,
• extended service life in a harsh environment.

Self-cleaning contact sleeves

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The challenge

Dust and contaminants that accumulate on the contacts increase the resistance of the connection, cause it to overheat and reduce the reliability of the power supply

How it works

The contact sleeves used in the HSP1P 32 W-SCT sockets are fitted with sliding elements which mechanically clean the contact surfaces each time the plug is connected.

Impact on the user

• a more stable electrical connection,
• limited build-up of deposits,
• a lower risk of developing resistance,
• greater reliability with frequent connection.

However, the self-cleaning function does not exempt the system from periodic inspections and maintenance.

Two cable entries

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HSP1P 32 W-SCT sockets can be fitted with two threaded cable entry holes:

• 2 × M32 or 2 × M40 for 20–32 A sockets,

This solution makes it easier to choose the route for the cables and allows for through-wiring. Any unused holes are sealed with certified, dedicated Ex plugs.