Automation Canada - Cables & Connectors Issue - 38

LIMITATIONS OF VOLTAGE INDICATORS AND TEST PORTALS

Impedance

Sensor leads
not connected

Line voltage,
unprotected leads

Test
Portal

Test
Portal

Front of
Door

Front of
Door

Voltage
Indicator

Voltage
Indicator

Poor workmanship or installation failures can lead to a
zero voltage indication when the conductor is energized.

Both Test Portal and Voltage Indicator leads bring hazardous
voltage to the door.
No voltage at test
point when fuse is open

Test
Portal
FUSE
FUSE

Front of
Door

Voltage
Indicator

If the fuse is open, zero voltage will be indicated when the
conductor is energized.

C A N A D I A N A U TO M AT I O N

VOLUME 3, ISSUE 2

38



Automation Canada - Cables & Connectors Issue

Table of Contents for the Digital Edition of Automation Canada - Cables & Connectors Issue

Automation Canada - Cables & Connectors Issue - 1
Automation Canada - Cables & Connectors Issue - 2
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Automation Canada - Cables & Connectors Issue - 42
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