Author Topic: 60Amp Donut work on smaller lines?  (Read 683 times)

toby_lang

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60Amp Donut work on smaller lines?
« on: December 03, 2017, 04:06:14 PM »
Hi sorry for the newb question. If I put the  60Amp Donut on a smaller line (15 Amp) will it still work?

pfletch101

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Re: 60Amp Donut work on smaller lines?
« Reply #1 on: December 03, 2017, 09:23:07 PM »
It will work. You won't get quite the same precision and (assuming that we are talking about Spyder CTs) the channel will read zero at and below a higher non-zero power draw than it would with a 20A CT. The optimal Spyder setup will use 20A CTs for all lines except those expected to see currents higher than 20A. Remember, too that a '40A' 230V breaker is looking at both 'sides' of the circuit, so each 'side' can be treated as if rated at 20A.
Peter R. Fletcher
TED Pro Home - main MTUs monitoring utility and PV Solar feeds; 2 Spyders monitoring selected individual circuits