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Hi guys, I own 2 megger mft 1552 testers.

I recently found that loop readings on both testers give me high Zs readings on final circuits protected by 30ma rcds on low current.
If I select the hi current setting I get a reading I expect to achieve, but the hi current test never trips the rcd.

Both testers have been calibrated in the last 3 months

Any advice?

Many thanks David
 
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