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It's not a calculation as such. I presume it's an open book exam?
There are tables (the one for this is the one on page 368 I believe) that show the tripping characteristics of various devices. You lookup the table for the device and then look at the line for the device rating and read of the time.
There are tables (the one for this is the one on page 368 I believe) that show the tripping characteristics of various devices. You lookup the table for the device and then look at the line for the device rating and read of the time.
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