3.08
The limiting factors of a satellite-type wiring
plan are keeping the voltage drop in the
lamp loop to less than 2 volts and maintaining a
low resistance A lead.
3.09
To keep the voltage drop in the lamp loop
to less than 2 volts, calculate the number
of additional 24-gauge cable conductors required
for lamp (L) leads as follows:
(1) Maximum allowable distance for one telephone
from the KSU (24-gauge cable)
=
667 ft.
(2) Distance between satellite location and
telephone set most distant from satellite
_ft.
(3) Subtract (2) from (1)
_ft.
(4) Maximum number of telephone sets to work
from satellite
=
(5) Divide (3) by (4)
=
_ft.
(6) Distance between KSU and satellite
=
_ft.
Where the distance in (5) is more than the
distance in (6), additional cable conductors are
not required. Where the distance in (5) is less
than the distance in (6), proceed to next step.
(7) Divide (6) by (5)
=
_.
(8) Subtract one from (7)
=
(9) Round off (8) to the next whole number
This number is the number of
additional 24-gauge cable conductors to be used
in parallel with each lamp (L) (IL) lead. This
number is also the number of additional 24-gauge
cable conductors to be used in parallel with each
lamp ground (LG) lead.
Note:
There are 5 lamp ground leads in a
station cable. Therefore, for each
additional
cable conductor used in parallel with a lamp
lead, there must be 5 additional lamp ground
leads.
3. 1 0
For purposes of illustration, assume a satellite
location is 350 feet from the KSU, the most
distant telephone set from the satellite is 175 feet,
and there will be four telephone sets working from
ISS 3, SECTION 5 1 8-450-1 00
the satellite.
The number of additional cable
conductors for lamp leads is calculated as follows:
(1) Maximum allowable distance for one telephone
from the KSU
=
667 ft.
(2) Distance between satellite location and
telephone set farthest from satellite
=
175
ft.
(3) Subtract (2) from (1), 667 minus 175
=
492
ft.
(4) Maximum number of telephone sets to work
from satellite
=
4.
(5) Divide (3) by (4), 492 divided by 4
ft.
123
(6) Distance between KSU and satellite
=
350
ft. As the distance in (5), 123 ft., is less
than the distance in (6), 350 ft., it is necessary
to proceed to the next step.
(7) Divide (6) by (5), 350 divided by 123
=
2.8.
(8) Subtract one from (7), 2.8 minus
1
=
1.8.
(9) Round off (8) to the next whole number
1.8
=
2.
Therefore,
two additional
cable conductors must
be used in parallel with each lamp and lamp ground
lead between the KSU and the satellite location.
A total of 18 additional lamp leads and 10 additional
lamp ground leads are required in this example.
3. 1 1
To maintain a low resistance A lead, where
a satellite is more than 200 feet from the
KSU, add four additional (24 gauge) cable conductors
in parallel (five total conductors) for the A1 lead.
Additional cable conductors are not required for
satellites located less than 200 feet from the KSU.
3. 1 2
No more than 1 7 stations can be associated
with a given satellite location.
C. Telephone Sets
3. 1 3
Install telephone sets at desired locations.
Install any telephone set options at this
time. Refer to Section 503-701-110 for schematics
and additional information on the 832- and 2832-type
telephone sets. For information on the 575AM
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