Figure 5-10.First step in testing an outlet with a neon tester.
identifying each pair of wires. The pair that is hot will
cause the neon tester to glow.
The grounded system is easiest to check because
only the potential hot wires need to be disconnected,
separated, and tested. Figure 5-14 shows how the wires
are separated and tested. The wire that causes the neon
tester to respond is the hot lead.
An ungrounded system can be checked just like a
grounded system? except the solderless connector must
be removed from the neutral wire and the neutral wire
must be used as a reference, as shown in figure 5-15.
Figure 5-16 shows how to determine if voltage is
reaching a light fixture. With the switch in the ON
position, the neon tester should light.
TESTING THE GROUND TERMINAL
A simple test procedure, as shown in figure 5-17,
may be used to check each receptacle for ground.
Figure 5-11.Using the neon tester to check for a defective
One lead of the neon tester should be held
stationary on the ground terminal while the opposite
lead is repositioned on each plug slot. If the receptacle
is properly grounded, the neon light will light when
placed in only one of the slots. If the light does not glow
in either slot, the receptacle is not grounded.
TESTING CIRCUIT BREAKERS AND
FUSES IN CIRCUITS
When you are troubleshooting large electrical
systems, it is important to follow the systematic
approach: localize, isolate, and locate. It is never a
good procedure to make haphazard measurements in a
system hoping that luck will lead to the problem.
Testing circuit breakers and fuses in the circuit first
may eliminate unnecessary troubleshooting. Practice