Vista Model 1 User Manual download pdf (Page 8)

2.Confirmthatthecableisde-energizedsoitcanbe

safelygrounded.Withtraditionalgear,themedium-

voltagecablesmustbetesteddirectlyusinga

clampstick-mountedtester.Butvoltagetestingwith

VistaUDScanbeaccomplishedsimplyandeasily

withouteveraccessingthecables.Simplyusethe

voltageindicatorsshowninFigure4.Thevoltage

indicatorisevenequippedwithaself-testfunction,

soyoucan“testthetester.”SeeFigure5.

3.Groundthecables.Insteadoftheawkwardtaskof

havingtomovetheelbowstoparkingstands,along

withthegroundingbushingsorelbows,withVista

UDSyouneedonlyrotatetheswitchoperatingshaft

tothe“grounded”position.SeeFigure6.Grounding

caneasilybeconfirmedbylookingthroughthe

viewingwindow.

Thereareevenmorebenefits:Thevoltageindicator

canbefurnishedwithalow-voltagephasingoption.

SeeFigure7.Thisfeatureallowsconfirmationof

properphasingwithouteveraccessingthecables.

VistaUDSallowsfault-locatingandhi-pottingtests

tobeperformedwiththecablesattached—andthe

busenergized.

Photocell for

energizing self-

test feature

Test window

Test button

LCD display

Test circuitry can be powered by

flashlight or bright sun

Place gloved finger over

test button to begin testing

Figure 4. Voltage indicator.

Figure 5. Testing the voltage indicator.

Figure 6. Grounding load-interrupter switch (or fault

interrupter).

Figure 7. Measuring phase-to-phase voltage—Phase

1 to Phase 1.

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Vista Model 1 User Manual Page 8