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The Types DS-19, DS-34, D S-38, DS-40, and DS-43
meters are back-connected, switchboard, two-stator,
.,
polyphase meters. The DS-20, DS-35, D S-39, DS-41,
and DS-44 are the corresponding three-stator meters.
The above meters can be furnished self-contained
in current capacities o
voltages up to 600 volts.
can be furnished for use with both current and poten
tial transformers or with current transformers only.
The meters are called Types DSW-19, DSW-34,
DSW-38, DSW-40, D SW-43, and DSW-20, DSW-35,
DSW-39, DSW-41, and D SW-44 when they are equip
ped with contact device terminals and 2-wire or 3-wire
contact devices.
contact devices accompany such meters.
The meters are known as Types DSM-19, DSM-34,
DSM-38, DSM-40, D SM-43, and DSM-20, DSM-35,
DSM-39, DSM-41, and DSM-44 watthour demand
meters when they are equipped with demand meter
registers.
Separate instructions covering the register
and containing supplementary diagrams and dimen
sions accompany these watthour demand meters.
The DS-19 and DS-20 polyphase watthour meters
are designed for surface mounting and are equ\pped
with two studs for this purpose at the top center and
bottom center of the case.
The DS-34 and DS-35 meters are the corresponding
polyphase watthour meters available for semiflush
mounting.
The meter is mounted through the panel
with the flange against the front of the panel.
in the flange will accomodate mounting bolts or
K6
screws
in. in diameter. No other support is necessary.
The DS-38, DS-39, DS-40, and DS-41 meters are
similar
to the
respectively, but provide the additional advantage of
a drawout construction.
may be mounted and wired permanently before the
meter unit is placed in the case.
then installed by aligning it with the guides in the
case and sliding into place.
SWITCHBOARD WATTHOUR METERS
.
5 and 10 amperes and for
Transformer-rated meters
Separate instructions covering the
INSTALLATION
DS-34,
DS-35,
DS-19,
and
The case for these meters
The meter unit is
The connecting plug is
POLYPHASE
next inserted completing the electric circuits through
the meter and locking the latch on the cradle.
cover is drawn to the case by four thumb-screws,
holding the connecting plug in place.
The DS-43 meter is the latest model
switchboard two-stator, polyphase meter.
sedes the D S-38 and DS-40 meters, and is so designed
that it may be used either for surface or semi-flush
mounting.
three-stator meter replacing the DS-39 and DS-41
meters and is also designed for use either for surface
or semiflush mounting.
ing are inserted from the back of the panel into thread
ed bosses on the mounting flange.
are hidden by the cover.
providing for any type of mounting (semi flush, sur
face, metal or insulating panel), and either type of
connection (threaded stud with nuts and flat washers
or washer head screw with prong washer) accom
panies each meter.
The proper dimension sketch given in this book
should be followed for switchboard drilling.
meters have jewel bearings which may be injured by
rough handling; consequently all wiring and hammer
ing should be done on the switchboard before the
meters are installed.
The meters have removable studs and are shipped
with the studs removed.
Before placing the meter in service, remove the
shipping device and make sure that the meter is
perfectly clean and in good operating condition.
Holes
The meters are tested before shipment and only
require connecting and sealing before being placed
in operation.
DS-20
The cover is held in position by sealing screws, four
on the drawout cases and two on all other meters.
The screws have knurled heads to permit tightening
with tlie fingers and are slotted to take all standard
types of sealing devices.
on the meter, make sure that the edges enter the
The DS-44 meter is the corresponding
Screws for semiflush mount
Screws and bosses
An assortment of hardware
SEALING
When assembling the cover
The
drawout
It super
The
3
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