S&C Instruction Sheet 682-510 25
Operation
Low-Voltage Phasing Using Optional
VOLTAGE Indicator with Phasing
STEP 1.
Clean the surface and phasing pins of the VOLT-
AGE indicator of dirt and debris. See Figure 45.
STEP 2.
Test the VOLTAGE indicators for proper opera-
tion by following the “Checking for Voltage
Using Optional Voltage Indicator” section on
page 22. If a VOLTAGE indicator is not operating
properly, phasing should be per formed using an
alternate method.
STEP 3.
Using a high-impedance voltmeter, as shown in
Figure 46, verify voltage is present and determine
the phase-to-ground voltage for each phase of
the two ways
●
to be phased as follows:
(a) Set the voltmeter for volts ac.
(b) Connect one of the test probes of the volt-
meter to the metal tank of the switchgear to
ground the voltmeter. See Figure 47.
(c) Place the other test probe on each of the
phas ing pins, in turn, for the two ways to be
phased and measure the phase-to-ground
voltage. See Figure 45. Ac voltage range is
5-8 Vac.
(d) If the voltage measured at each phasing pin
is greater than zero and they are equal,
pro ceed to Step 4 on page 26.
(e) If the voltage measured at any of the phas ing
pins is zero, the phases are not ener gized and
phasing cannot be performed. If the voltages
measured are not equal, the voltmeter may
not be operating properly. Phasing should be
performed using an alternate method.
●
A “way” consists of a three-phase load-interrupter switch, a three-
phase fault interrupter, a bus tap, or three sin gle-phase fault interrupters .
Figure 45. Before performing phasing, thoroughly clean the surface
and Phasing pin.
VOLTAGE indicator
Connect the probe to the metal tank to ground the voltmeter
Connect the other probe to the Phasing pin
Figure 47. Test probes are connected to metal tank to ground voltmeter and
to a Phasing pin.
Figure 46. High-impedance voltmeter and test probes.
Set voltmeter to
volts ac
Probe
Voltmeter
Phasing Pin 1
Phasing Pin 2
Phasing Pin 3
