Three Terminal (3-Pin) Socket Phase-Earth Loop Impedance Test - Megger Lt5 Gebrauchsanleitung

Fig. 1. Testing the earth fault loop impedance at a
3-pin socket
THREE TERMINAL (3-pin) SOCKET PHASE —
EARTH LOOP IMPEDANCE TEST
(single phase 216 V — 253 V a.c. outlets) — see
fig. 1)
Connecting the Instrument
1. Connect the test lead socket to the recessed plug
in the instrument.
2. Ensure that the slider switch on the instrument is
set to '0'.
3. Connect the plug at the other end of the test lead
to the socket of the installation under test.
Polarity and Earth Continuity Test
4.Switch the socket on. Both the 'P - E' and 'P - N'
neon indicator lights should illuminate. If either
does not, switch the supply off and investigate the
reason.
5. If the 'P-N' neon light does not illuminate, but the
'P-E' does, either: (i) the neutral is not connected
in the socket or is open circuit; (ii) the phase and
earth are interchanged or (iii) all three
connections are incorrect. Check the socket
wiring and correct if necessary.
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