Submain trip times
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Alex Gordge
Circuit test at 1×𝐼Δ𝑛 current but 'Not connected to origin' info is 5×𝐼Δ𝑛 current, so isn't sharing trip time across with rest of characteristics, do submains need to be 5x or can that be changed to 1x now and auto pull the timing from primary board?
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Michael Adrian
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Michael Adrian
Thanks for raising this! It's actually a very common area of confusion at the moment, as some electricians still test at 5×IΔn out of habit while others have switched to just 1×IΔn.
If we go by the big brown book, the standard way to test this now is only at 1×IΔn, as the requirement to test at 5×IΔn was completely removed with the introduction of Amd 2 in 2022.
Regarding the app: Using a circuit in DB01 to feed another board will auto-pull all the relevant details across, including the trip times. The confusion here was actually a mistake on my side, the UI label still said 'Operating Time @ 5×IΔn'. I've just updated this field to simply say 'Operating Time' so it accurately reflects the Amd 2 requirements and the final PDF version.