SECTION IV INPUT AND OUTPUT CIRCUITS
1. INPUT:
A. INPUT VOLTAGE: The AVO International Circuit Breaker Test Sets are designed to
operate on a single phase voltage source.
If
the nominal rated voltage source
is
not
available, or if use at various locations requires the capability to operate the test set
from several different input voltages an optional input autotransformer may be used
(see Bulletin
in
Section I for description) .
. B. INPUT LEADS: The power source must have sufficient capacity to maintain RATED
input voltage at the
INPUT terminals
of
the test set. All units are supplied with
15
foot 2
10
input cables with connectors on one end. This
is
done in an effort to
provide a locking input connector, for safety purposes, along with input cables that
are appropriate for a minimal amount
of
voltage drop from the input source to the
input terminals
of
the test set. Although the test sets are designed to operate
satisfactorily at 95-105%
of
rated voltage, any drop in voltage below RATED at the
input terminals will result
in
a proportional decrease
in
the maximum available
output.
NOTE: To achieve published output currents, the rated input voltage must be
maintained at the test set terminals during the test.
C.
GROUNDING: For safety, ground wires must be connected to the test set chassis
in order to energize the test set.
One ground lead must be connected to the ground
terminal located just
belowlhe
input plug to system ground. The size
of
the
conductor should be not less than 6 AWG. Due to the special ground interlock
circuit, a second lead must be connected from the green GND binding post to a
separate, but compatible system ground. This will insure that a ground has been
achieved and allow the test set to be energized.
D.
SAFETY PRECAUTIONS:
CAUTION
For
safety
of
the operator, it is absolutely essential that the test set be properly and
effectively grounded.
2. OUTPUT:
A.
SELECTION OF OUTPUT CONNECTIONS: Two output connections, parallel
and
series, provide various voltage and current ratings to adapt AVO International Circuit
Breaker Test
Sets to a wide variety
of
test circuit impedances.
The test sets can be operated most effiCiently by utilizing the parallel connection,
which provides the
HIGHEST CURRENT rating consistent with being able to obtain
the desired test current.
In
this way, finer adjustment can be obtained by making
maximum use
of
the variable autotransformer range .. Even the smallest currents
can be obtained from the parallel connection. The series connection should be used
only when testing high impedance devices where the parallel connection does not
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