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Ericsson DIALOG - Cord Specifications and Durability

Ericsson DIALOG
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3,6
Cor
ds
F
ig
.
23
The m echa
n-
ical
unl
oa
ding
of the
cord
.
Th
e dete
nt
is
fixe
d to a hole
in the b
ase
plate
F
ig
.
22
Handset
and
instru-
m e
nt
co
rds
a
re
mad
e
of
PVC
At
the
rear
of
the
instrument
there
is
a
transparent
plastic
inset
(fig. 21).
The
light
so
admitted
into
the
instrument
discourages
the
entry
of
insects.
The
inset
also
acts
as
a
support
for
the
selfretaining
screw
and
retains
the
plungers
when
the
case
is
removed.
The
inset
at
the
rear
edge
of
the
case
is
kept
in
place
by
the
flat
spring.
The
case
is
on
the
inside
provided
with
several
ribs
,
which
correctly
locate
the
case
relative
to
the
base
plate.
On
the
left-hand
side
of
the
case
(seen
from
the
front)
are
small
inlets
for
the
handset
and
instrument
cords.
The
cords
(fig.
22)
consist
of
three
PVC
insulated
conductors,
which
are
covered
by
a PVC
sheathing.
This
execution
prevents
humidity
from
penetrating
which
could
cause
shortcircuiting
between
the
conductors.
I
All
conductors
are
of
standard
tinsel
threads,
each
composed
of
4 x 2
flexible
cadmium
copper
alloy
tapes,
lapped
around
a
polyester
centre.
This
design
gives
maximum
flexibility.
The
conductors
,
insulated
by
PVC of
various
colours,
are
laid
side
by
side
to
form
a
core.
which
is
covered
by
PVC.
The
nominal
diameter
of
each
uninsulated
conductor
is
0. 8
mm.
The
thickness
of
the
PVC
insulation
is
0.25
mm
.
Thus
the
diameter
of
each
insulated
conductor
is
1. 3
mm.
The
overall
diamet
er of
the
c
ord
is
4.4
mm.
The
electrical
resistance
of
each
conductor
does
not
exceed
1.0
ohm/
mat
a
temperature
of
2o
o
c.
The
length
of a
normally
extended
handset
cord
is
1. 3 m
and
the
instrument
c
ord
is
1. 7 m long.
The
conductors
are
provided
with
cable
lugs
for
the
connec
tion
to
the
terminal
screws.
The
instrument
cord
has
a
separate
conductor
for
connection
of
an
extra
bell
to
the
wall
terminal
box.
A
continuous
study
of
the
maintenance
of
instruments
has
shown
that
the
length
of
life
of
the
cords
depends
to
a
high
deg
ree
on
whether
or
not
mechanical
strain
is
allowed
to
spread
to
the
cable
lugs
and
screw
terminals.
A
cord
provided
with a
good
mechanical
unloading
device
to
relieve
the
strain
on
the
cable
lugs
,
has
a
longer
life
than
a
cord
with a
weak
mechanical
unloading
devi
ce.
15
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