Question 1
Are there any restrictions for measuring devices to be used in an Intrinsically safe loop?
- Yes.
- No.
- Only when working in a zone environment.
Exi Installation and Inspection
CBT 30 questions
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Question 2
From where does the clearance requirement count?- From the centre of the housing of barrier or terminal.
- From the «metal» in the terminal to metal.
- From the edge of the housing of barrier or terminal.
Question 3
How many IS circuits may be routed through a junction box containing non-IS circuits without reduction of the level of protection?- No limitation.
- IS circuits may never be routed through a cabinet or junction box carrying non-I. S.
- Only 2 circuits.
- Only one.
Question 4
How to verify how many zener diodes that are broken in a Zener barrier?- Megger test between IS and non-IS side.
- There shall always be an indicator on the barrier side.
- Unfortunatly, not possible.
Question 5
If the cable parameters are unknown, what to do?- Test it according to procedure in IEC 60079-14.
- Use another cable.
- Use the «standard» values stated in IEC 60079-14.
- All of the options are OK.
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About this CBT test
Exi Installation and Inspection is a CBT test with 30 questions and verified answers. Common topics include: level protection, multicore circuit, minimum creepage, circuits, earth, clearance, cable, junction.
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