.,
POLYPHASE
SWITCHBOARD WATTHOUR METERS
The Types DS-19, DS-34, DS-38, DS-40, and DS-43
meters are back-connected, switchboard, two-stator,
polyphase meters. The DS-20, DS-35, DS-39, DS-41,
and DS-44 are the corresponding three-stator meters.
The above meters can be furnished self-contained
in current capacities o
.
5 and 10 amperes and for
voltages up to 600 volts. Transformer-rated meters
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, DSW-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. Separate instructions covering the
contact devices accompany such meters.
The meters are known as Types DSM-19, DSM-34,
DSM-38, DSM-40, DSM-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.
INSTALLATION
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. Holes
in the flange will accomodate mounting bolts or
screws
K6
in. in diameter. No other support is necessary.
The DS-38, DS-39, DS-40, and DS-41 meters are
similar to the DS-34, DS-35, DS-19, and DS-20
respectively, but provide the additional advantage of
a drawout construction. The case for these meters
may be mounted and wired permanently before the
meter unit is placed in the case. The meter unit is
then installed by aligning it with the guides in the
case
and sliding into place. The connecting plug is
next inserted completing the electric circuits through
the meter and locking the latch on the cradle. The
cover is drawn to the case by four thumb-screws,
holding the connecting plug in place.
The DS-43 meter is the latest model drawout
switchboard two-stator, polyphase meter.
It super
sedes the DS-38 and DS-40 meters, and is so designed
that it may be used either for surface or semi-flush
mounting.
The DS-44 meter is the corresponding
three-stator meter replacing the DS-39 and DS-41
meters and is also designed for use either for surface
or semiflush mounting. Screws for semiflush mount
ing are inserted from the back of the panel into thread
ed bosses on the mounting flange. Screws and bosses
are hidden by the cover. An assortment of hardware
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.
The
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.
The meters are tested before shipment and only
require connecting and sealing before being placed
in operation.
SEALING
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. When assembling the cover
on the meter, make sure that the edges enter the
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