UK 18th edition help

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Daniel Smith

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What is the calculation required For the image attatched? Any help would be appreciate, thanks.
 

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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.
 

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