CES CBT Test Online on Electrical Installation in Ex-area

Welcome to the website where you can pass online the CES CBT CD-8533 test on the subject «Electrical Installation in Ex-area». Practice like this will help you as a marine specialist improve your knowledge with the help of online studying and appraisal practice. CES based on practical information and marine specialists experience.

CES tests developed for evaluating seaman basic knowledge by Seagull Company (rebranded as «OTG»), is an evaluating online-tool, used for revealing any professional preparation needed in specific fields of knowledge, defined by STCW.

CES tests have proven themselves as good tools for the selection and recruitment process, as well as advancing the level of knowledge of the current officers and crew. Ocean Technologies Group use various subjects for question creation, which includes:

Crowd and Crisis Management;
Integrated Navigation System (INS);
Ballast water management;
Handling and Stowage;
Vessel operation management and safety;
Marine engineering;
Maintenance and repair, etc.

Current test contains Seagull CES questions on the subject «Electrical Installation in Ex-area». Those questions can be used for competence verification specialist capable of preventing accidental situations related with transporting safety, or also for self-examination.

«Electrical Installation in Ex-area» subject includes theoretical and practical information about advanced training for work on any type of vessel. The test is designed to provide training for personnel working on ships of various types. The course equips maritime personnel with specialized knowledge and skills for safely installing and maintaining electrical systems in hazardous environments on board vessels. This advanced training covers the theoretical principles of explosion protection, including the selection and application of Ex-rated equipment and components. Participants will gain hands-on experience in wiring, terminating and testing electrical installations in accordance with international standards and regulations for Ex areas. The test emphasizes the importance of risk assessment, hazard identification and the implementation of appropriate safety measures during electrical work in potentially explosive atmospheres. Trainees will learn to interpret Ex zone classifications, understand equipment marking systems, and select suitable cable glands, junction boxes and other Ex-rated accessories. Practical exercises and simulations will allow participants to apply their knowledge in realistic scenarios, ensuring competency in safe electrical installation practices. This specialized training is essential for electricians and technicians working on ships carrying flammable cargoes or operating in environments with potential explosion hazards. By completing this course, sailors contribute to the prevention of electrical accidents and ensure the safe operation of electrical systems in Ex areas on board vessels.

On this site Crew Evaluation System Test on the subject «Electrical Installation in Ex-area» contains 32 questions you need to answer with no possibility to go back to previous question. Therefore, we recommend carefully reading each question and making decision with no hurry. In case you have some difficulty answering, you have also possibility to request a hint.

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Amount of questions: 32.

Right answers marked with this sign .

After 2008, are you allowed to install uncertified cable glands in Ex e equipment in Zone 2?

Yes, as long as it is made of brass.

No, all cable glands shall be certified.

Can we modify the purge time on a Ex «p» enclosure?

Purge time is not applicable for Ex p enclosures. Only T-class.

No, unless the documentation from the manufacturer states otherwise.

Yes, adjustable depending to customer requirements.

Can we use Ex «e» cable glands as a direct entry to a Ex «d» enclosure?

Depends on the Zone.

Yes.

No.

Can you install a Ex d IIA T6 enclosure in a IIC environment?

No, the enclosure is not designed for IIC gasses.

Yes, but not for a IIB gas.

Yes, IIA gasses are «worse» than IIC gasses.

Can you use greased tapes (like Denso tape) on flanged Ex d enclosures in a IIA environment?

Yes.

No.

Only if the gap in the enclosure is below 0,01 mm.

Does scratches on a flame path affect the safety of Ex «d» enclosures?

No, as this concept is all about limiting the electrical energy, this does not affect the protection.

Yes, the IP rating might be affected. Solve this with additional grease.

Yes, it might not be able to cool down the escaping gasses from the internal explosion, leading to ignition of the surrounding atmosphere.

How is the concept Ex d protected:

No arcs, sparks or high temperatures allowed inside the enclosure.

Pressurized, the gas will never come in contact with internal ignition sources.

It contains and cools down the ignited gasses prior to escaping the enclosure.

How is the concept Ex e protected:

Flameproof.

Intrinsically safe.

Prevent arcs, sparks and avoid temperatures exceeding the T-class.

Overpressure.

How many threads is the minimum you need when installing a cable gland into a Ex «d» enclosure?

3 full threads.

5 full threads.

8 full threads.

If no rating for the ambient temperature is stated on the component, what is the intended ambient temperature rating for the component?

-20 °C to +40 °C.

-40 °C to +40 °C.

-40 °C to +50 °C.

Into which zones are Ex «n» equipment acceptable?

Zone 0, 1, 2.

Zone 1 and 2.

Only zone 2.

Into which zones are you allowed to install the following equipment: II 2 G Ex d IIC T5 Gb?

Zone 0, 1, 2.

Zone 1 and 2.

Zone 2.

Into which zones may you use Ex n* equipment?

Only zone 2.

Only with IIB gasses.

Zone 0, 1 and 2, depending on the T-class.

Is it a problem with bad terminations in Ex «e»?

Yes, arcs and sparks is not accepted in a Ex «e».

No, the enclosure is able to withstand an internal explosion.

No, the enclosure is pressurized.

May you drill new holes into Ex e enclosures?

No, newer.

Yes, you may always modify Ex e enclosures.

Only if this is in accordance with the manufacturer’s instructions.

Name a typical example of a cylindrical flame path:

Shaft on a Ex d motor.

Lid on a threaded enclosure.

The threads on a compression cable gland.

What are the principles behind the Ex nL concept?

Explosion quenching.

Energy limitation.

Pressurization.

What does the «U» in the certificate reference mean?

The equipment or device is only component certified.

The equipment can be installed without any precautions.

The equipment has got special conditions for safe use.

What does the «X» in the end of the certificate reference mean? E. g. ITS 01 ATEX 0402X?

The component is only equipment certified.

The equipment has got special conditions for safe use.

The equipment can be installed without any precautions.

What does the roman numbers II mean in EEx e II T6?

Enclosure is for mining.

Enclosure only for dust.

The same as IIC, suitable for all gasses.

What equipment can we use in an environment with T4 requirements?

Only T4.

T1, T2, T3, T4.

T4 T5, T6.

What is the acceptable solution for spare conductors in a junction box?

Terminate in an appropriate terminal or connect to the same earth reference as the circuit.

Cut wires at the base of the cable and use tape to isolate them.

Use tape to insulate the spare conductors.

What is the main purpose of grease on the flame paths?

Protection against corrosion.

To make the threaded enclosures easier to open.

To offer a higher IP rating than stated on the marking plate.

What is the minimum IP rating for a Ex «e» junction box with bare live parts?

IP 20.

IP 54.

IP 67.

What is the minimum distance between a flanged flame path of an Ex d enclosure and an obstacle in a IIC environment?

10 mm.

30 mm.

40 mm.

What is the principles behind the Ex nR concept?

No arcs and sparks.

Restricted breathing.

Simplified flameproof enclosure.

What is the purpose of Ex «p» enclosures?

It keeps the explosive atmosphere away from the ignition sources by keeping a positive overpressure inside the enclosure.

Contains the internal explosion.

The sources of ignition is encapsulated in a epoxy resin.

What is the purpose of the flame path on flameproof enclosures?

It gives the enclosure mechanical protection.

Cool down the escaping gasses from the internal explosion.

Provide a good IP rating.

What is the requirement for shutting down a Ex «px» enclosure?

No requirements for shutdown. The equipment on the inside is certified for minimum zone 2.

Loss of pressure, needs a new full purge time before start up.

Only alarm.

What is the temperature represented by T6?

85 °C.

280 °C.

450 °C.

What zones are the following equipment suitable for: II 2 G, Ex e IIC T6 Gb?

Zone 0, 1, 2.

Zone 1 and 2.

Zone 2.

When must you use an Ex «d» barrier gland (compound filled) when installing directly into an Ex «d» enclosure?

Always, no exception.

If the cable is not with extruded bedding.

Never, barrier glands are typically used on Intrinsically safe circuits.