10
MAXIMUM LENGTH FOR CABLE RUNS
As stated in the previous section the system may be Star Wired from a central point
or Loop Wired however the number of stations on a loop is governed by the length of
the loop, and also whether or not a standby battery is being used in conjunction with
the supply.
The table below shows the relationship between the length of a cable run and the
number of stations permitted on the run. The length of a cable run is determined from
the station to which the Power supply is connected.
WITHOUT STANDBY BATTERY WITH STANDBY BATTERY
400 feet - one station on loop 200 feet - one station on loop
200 feet - two stations on loop 100 feet - two stations on loop
130 feet - three stations on loop 70 feet - three stations on loop
100 feet - four stations on loop
Note: These maximum distances can be doubled where required by running a
‘fig 8’ cable (18 gauge) in parallel with the red & black wires.
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