The figure below also shows which slots of two other
common 110VAC receptacles are hot. In both cases,
the “hot” slot is on the right and smaller.
2. If the beeper sounds and the LED flashes when the
tip is in the larger (left) slot of a modern 15A outlet,
the outlet is energized but wired in reverse.
3. If the beeper does not sound and the LED does not
light when the tip is in either slot, the circuit is
de-energized.
To determine whether an unknown 220VAC outlet is
energized
, first maximize the VR40’s sensitivity by
pressing and holding the
NCV
button and
simultaneously pressing the
IRT
button as many times
as necessary until “four bars” show on the NCV
sensitivity level bar graph. Then press and hold the
NCV
button while inserting the blade tip of the VR40 into all
slots of the outlet, one at a time. If the beeper sounds
and the NCV detection LED near the tip flashes with the
tip inserted in any slot, the outlet is energized.
15
Modern NEMA 5-15
outlet
Modern NEMA 5-20
outlet
Old NEMA 1-15
outlet
