Ex e & Ex n equipment questionnaire

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Ex e & Ex n equipment questionnaire
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About this collection

CompEx questions are organised into topic-based sets including Ex d, Ex e, Ex n and intrinsic safety. Select a subject to study at your own pace or complete a timed practice attempt.

“CompEx — Ex e & Ex n equipment questionnaire” contains 18 questions across 1 collection.

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18) The number of cores of different cross-sections that may be connected to any one terminal in an Ex e enclosure is?

One correct answer

(I) Two, if the cores are fitted round the terminal screw in the shape of a 'U';
(II) Dependent on the size of the core;
(III) One;
(IV) One, unless the certification documents permit otherwise.✓ Correct answer

6) A steel Ex e enclosure has a threaded entry 10mm in length. Which one of the following options achieves the minimum installation requirement when fitting an Ex e E1W cable gland?

One correct answer

(I) Fit gland;✓ Correct answer
(II) Fit gland, external IP washer and internal serrated washer;
(III) Fit gland, external IP washer and internal lock nut;
(IV) Fit gland, earth tag, serrated washer and internal lock nut.

12) Which one of the following restrictions apply to Ex e & Ex n light fittings?

One correct answer

(I) Lamps using non-conducting end-caps or pins with a conductive coating unless tested with the equipment;✓ Correct answer
(II) Lamps using conducting end-caps or pins are prohibited;
(III) Lamps with screwed connections are prohibited;
(IV) Fluorescent lamps must be bi-pin.

17) An EExd motor has an EEx e terminal box and was installed in 2005. Which one of the following meets the minimum requirement for the cable gland?

One correct answer

(I) An uncertified gland complying with the IP and impact requirements for EEx e;✓ Correct answer
(II) An El WF cable gland;
(III) An EEx d cable gland;
(IV) An EEx i cable gland.

7) For Ex e equipment installed in 2005, which one of the following glands is not acceptable?

One correct answer

(I) E1W Ex e certified;
(II) EW1 uncertified;
(III) ElWF Ex d certified;
(IV) Uncertified plastic.✓ Correct answer

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