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TYPE 048 FLEXITEST SWITCHBOARD METERS
FT-21 Case
WARNING
To avoid bodily injury and/or propert y damage, it is recommended
that installation, testing, and servicing be done only by authorized
personnel using appropriate installation procedures.
GENE R A L
The meter elements are mounted o n a removable chassis,
which is held in the case by two latches.
between the case and the chassis are made through the
test switches.
CAUTION
Automatic shorting switches are provided on all current cir·
cuits to prevent opening current transformers when testing
or removing the chassis to avoid electrical shock or bodily·
injury.
For testing, leads can be clipped to the test lugs above the
chassis jaws and on the switch blades.
All rotors are supported by a maintenance-free Magne
thrust bearing system and include a pinion for operating
gear-driven pulse initiators.
Two test plugs are available to facilitate calibration of these
meters.
A 10-circuit plug is inserted into the chassis jaws
and is provided with binding post terminals for connections
to the test circuit.
Current measurements are made by
connecting ammeters to a current circuit test plug, which is
then inserted into the current switcn assembly, between the
chassis and the case.
1
Balance Adjuster
Light Load Adjuster
The hardware supplied with the meter permits semi-flush
mounting on panels up to 3/16 inch thick.
mounting on panels thicker than 3/16 inch, special hard·
ware is furnished upon request (specify panel thickness).
Provisions have been made on all FT-21 cases for con
venient field
m1t1ators.
All connections
back of the case near the top) will permit installation of
an output terminal block and pin assembly.
bracket
meter frame and latch assembly.
will be closed by inserting the meter frame and latch
assembly into the case.
kit form for each type of pulse initiator.
CA LIB RATION
All meters have been factory tested before shipment. For
single stator meters, the full load test speed is 16-2/3 rpm,
and the watthour constant is 0.6 per nominal 600-watt
rating (constant of 7.2 for 30 amp, 240 volt meter). For
two-stator meters, the full load test speed is 8-1/3 rpm,
and the watthour constant is 1.2 per nominal 300-watt
rating.
8-1/3 rpm, and the watthour constant is 1.8 per nominal
300-watt rating.
Full Load
Single stator sensitivity is approximately 1.3 percent per
turn.
1.2 percent per turn.
D4B-7F Chassis
installation
of either 2- or 3-wire pulse
Removal of three knockouts (located in the
dnd socket assembly
is then attached to the
All necessary parts are available in
For three-stator meters, the full load test speed is
Two- and three-stator sensitivity is approximately
I. L. 42-227
For projection
A mating
The output circuits
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