Ideal SureTest 61-164 Manual De Instrucciones página 5

Troubleshooting Tips for Voltage Issues
Measurement
Line Voltage
108-132VAC
120VAC
198-242VAC
220 VAC
Neutral-Ground
<2VAC Voltage
Voltage
Peak Voltage
153-185VAC
120VAC
280-342VAC
220VAC
Frequency
WARNING: Do not exceed the unit's maximum voltage rating of 250VAC. The
SureTest is rated for use at 120 and protected to 250 volts in case of miswired circuits.
Immediately unplug the unit and do not press any buttons if 240 volts is displayed.
Voltage Drop (V
D
The SureTest measures the line voltage, applies a load on the circuit, measures the loaded voltage,
then calculates the voltage drop. Results are displayed for 12A, 15A, and 20A loads. The National
Electrical Code recommends 5% as the maximum voltage drop for branch circuits for reasonable
efficiency (NEC article 210-19. FPN 4). And, the voltage under load (V
108VAC for reliable equipment operation.
A good branch circuit should start out with less than 5% voltage drop at the furthest receptacle
from the panel at the end of the cable run. Then, each receptacle tested in sequence towards the
panel should show a steady decrease in voltage drop. If the voltage drop is above 5% and does
not noticeably decrease as you get closer to the first device on the circuit, then the problem is
between the first device and the panel. Visually check the terminations at the first device, the wir-
ing between the device and the panel, and the circuit breaker connections. High resistance points
can usually be identified as hot spots using an infrared thermometer or by measuring the voltage
Expected
Problem
Result
High/low
High G-N <2VAC
High/low peak
voltage
High/low
60HZ
frequency
) Measurements
Possible Causes
Too much load on the load
on circuit.
High resistance
connection within the
circuit or at the panel.
Supply voltage too
high/low.
Current leaking from
neutral to ground.
Unbalanced 3-phase
system.
Triple harmonics
returning on neutral in
3-phase system.
Supply voltage too
high/low.
High Peak Loads on line
caused by electronic
equipment on line.
Supply frequency too
high/low.
5
Possible Solutions
Redistribute loads on the
circuit.
Locate high resistance
connection/device and
repair/replace.
Consult power company.
Identify source of leakage;
multiple bonding points
equipment or devices.
Check load balance and
redistribute load.
Oversize neutral to
impedance. Reduce
harmonic effect via
filter or other methods.
Consult power company.
Evalue number of
electronic devices on
circuit and redistribute if
necessary.
Consult power company.
) should not drop below
L