Besantek BST-ET14, Инструкция по эксплуатации

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When there is no line
connected to the tester,
all the neon lamps will be
off as if nothing would be
connected.
If only the C neon lamp is
lit, this means that the line
and earth wires connecting
to the tester are reversed
(swapped).
If only the A neon lamp is
lit, this means that the line
and neutral wires
connecting to the tester
are reversed (swapped).
(2) Testing ELCB/RCD (protection device).
Disconnect all breakers and circuits which are not to
be tested but which are in circuit as they may bring
standing leakage which can complicate testing.
Insulate these circuits. In the case of testing a
domestic breaker, begin test by starting with a non
tripping value (10mA).
Plug the tester into the outlet.
Ensure the wiring is correct.
Then press the red button to inject
the fault current of 10mA.