A MINIMUM separation distance of 305 mm (12 in) between telecommunication cables and power cables with EMI exceeding 5 kVA is acceptable in which of the following cases?
Hmm, this one's a bit tricky. I was about to go with B, but then I remembered that the question specifically mentions 'EMI exceeding 5 kVA', so the metal conduit is probably necessary. C it is!
Is this a trick question? I would have gone with A, since the telecom cables are already shielded in a metal conduit, so the power cables don't need to be shielded too. But I guess C is the right answer.
I think the correct answer is C. Enclosing both power and telecom cables in grounded metal conduits provides the necessary shielding to meet the minimum separation distance requirement.
Jeffrey
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