Beha-Amprobe Telaris Series User Manual
Also see for Telaris ProInstall-100-CH: User manual
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Contents
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18RCD testing in IT systemsRCD testing at locations with IT systems requires a special test procedure because theProtective Earth connection is grounded locally and is not tied directly to the power system.The test is conducted at the electrical panel using probes. Use the connection shown inFigure 18 when performing RCD testing on IT electrical systems.RCDMains SupplyPE (L2/Green)L (L1/Red)N (L3/Blue)Figure 18. Connection for RCD Testing on IT Electrical SystemsThe test current flows through the upper side of the RCD, into the L terminal, and returnsthough the PE terminal.Alternative procedureIn IT systems, when testing an RCD at a mains socket: Use the mains test lead but do notconnect the N-wire to the instrument, so just the PE and L inputs are used. See figure 18a.BGRFigure 18a.Measuring Earth ResistanceFigure 19. Earth Resistance Display/Switch and Terminal Settings |
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