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McMurdo · 29th Dec 2018, 1:16 am

Originally my combination of isolation transformer followed by variac would trip the main B20A breaker feeding the socket, and for a while I fed the transformer off the variac to lessen the surge.

Then I fitted an NTC surgeguard to the transformer and it's cured that, so that is plugged in first.

29th Dec 2018, 1:16 am	#3
McMurdo Dekatron Join Date: Jun 2009 Location: Staffordshire Moorlands, UK. Posts: 5,274	Re: Variac first or Isolation first ? Originally my combination of isolation transformer followed by variac would trip the main B20A breaker feeding the socket, and for a while I fed the transformer off the variac to lessen the surge. Then I fitted an NTC surgeguard to the transformer and it's cured that, so that is plugged in first. __________________ Kevin