This Question of the Day concerns the fault ratings of tri-rated cable. It is answered by Draka (Theme – Cables and Wiring):
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| The fault ratings of tri-rated cable? |
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This Q & A is one of thousands posted in our Technical Expertise area, and answered a daily basis by our Voltimum Experts.
Question: I've been asked by a customer to supply him the fault ratings of tri-rated cable, but I cannot find them and my supplier does not have them. Can you please help?
Answer: The maximum short rating current is based on a temperature rise from 90oC to 160oC.
The calculation for a one second short circuit is: conductor CSA x k
(where k = 100).
Ratings for other durations (t): conductor CSA x k / square root 't'
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