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Megger X1 - anyone getting a vastly higher PEFC reading (2ka more) on 2 wire no trip, than PEFC on 3 wire
Discuss Megger X1 PEFC readings in the UK Electrical Forum area at ElectriciansForums.net
thought maybe new megger X1 may need a software update , purchased today but calibration sheet was april 23 . done same test on MFT 1711 and both were similiar readings, however rcbo tripping on no trip low on 1711 crabtree starbreaker i always seem to get them tripping, i reverse earth in phase and phase in earth socket on megger and test runs ok , no problems on new X1 just the unusually high PEFCIt's not unusual to get a higher reading on a low current loop test than on a normal loop test and therfore the calculated fault current will be lower.
This has been referred to as 'RCD uplift' by some people as it can be the result of impedance through an RCD though the same problem can occur with low current tests when there is no RCD in the circuit.
This is one reason why a high current loop test should always be used whenever possible.
Reply to Megger X1 PEFC readings in the UK Electrical Forum area at ElectriciansForums.net
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