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 MIL-HDBK-1023/4
HIGH RESISTANCE GROUND.
= ON
= DIM
= OFF
S1-B
S1-A
45 W EDGE LIGHT
ON
REGULATOR
GROUND
45 W ISOLATION
S1-A: TYPICAL INSTALLATION ON LOAD CIRCUIT - HANDLE INSTALLED.
S1-B: GROUND RETURN SWITCH WITH GROUND CURRENT INDICATING LIGHT -
HANDLE REMOVED.
NOT RECOMMENDED FOR REGULATORS WITH 2400V OR 4160V INPUTS.
CAUTION: OPERATE S1 HANDLES WITH LOAD DE-ENERGIZED
Figure 29
Two Grounds on Load Circuit - Ground Return Method
(d) Notice that we have three light conditions: on (full intensity), dim, and off.
The two grounds can be located quickly by driving the circuit and looking for the on/dim and
dim/off light transition.
g) Sectional Isolation Method. The sectional isolation method is the most common
approach to isolating grounded and open circuit type faults in a series circuit. This approach
requires more time and labor than the previous methods but will locate those faults when all
other methods have failed.
(1) The "Sectional Isolation Method" is a process of elimination to locate grounds
and opens in series circuits. Both procedures for troubleshooting grounds and opens utilize a
Megger insulation tester lengths of load circuits.
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