Cable Heating Calculation

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mityeltu

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Tennessee
I have an MOV with FLA=15.1A and an installed cable with a rating of 14A. I have been asked to deterine if this will be acceptable. I ave used ETAP to show that the damage curve will not be approached based on the stroke time of the valve, but I am being asked what the temperature of the cable will be after the stroke is complete. In other words, I'm looking for a way to calculate the temperature of a cable after short duration overload.

Just because I know everyone will ask:

The cable is 600V, 3-conductor #10 with CPJJ insulation. I know it's rated at greater than the 14A but this is a design standard I am required to use.

Does anyone know of a calculation method for this that I could reference in an exception to my comany's design standard? It would need to be ANSI or IEEE or something (probably ICEA).
 
Mityeltu...

I have used Fig 4-16 (Pg 4-86) of Fink?s, "Standard Handbook for Electrical Engineers, 10th Ed!" However, the values you have mentioned so small they aren't on the chart! But, I'm sure you can construct a similar graph for your parameters using Log-Log Graphing paper. If not, then apply the formula on page 4-87!
Regards, Phil Corso
 
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