Intercall 600/700 Installation & Operation Guide Issue 4.27 Page 18 of 78
Planning an Installation.
• Locate the L717 PSU/Controller in a central location of
the building and run “Spine” cable(s) to FJB and Booster
Power supply locations. We recommend one FJB/Booster
location per floor & the spine cable running between floors.
• Run a maximum of 4 cable spurs from the FJB’s each no
longer than 60 metres with a maximum of 25 current
units per spur. See the chart on the right for a “Current
Unit” rating for each network device.
• If the system requires more than 100 current units – split
the system with a Booster Power Supply.
• If the system requires more than 600 metres of network
cable (including the spine and all spurs) – split the system
with a Booster Power Supply.
• Each spine cable must be no longer than 80 metres from
Master Power Supply to furthest Booster Power Supply
(or FJB)
• All Booster Power Supply inputs must be connected to the Master Power Supply output. See page 33
• Avoid running Network cables alongside mains cables., fluorescent lights, electrical switch-gear, lift machinery
and motors and high voltage cables.
• Never use two cores within a cable used for other systems. Eg Fire Alarm, Telephones etc.
• There must be NO CONNECTION between the Network + or – and mains electrical earth.
• IMPORTANT The spur length limits assumes that units are located at regular intervals along the length of the cable
and that a maximum of 20% of the call points are calling at any one time. This limit can be increased by reducing the
length of spur or number of current units attached to the spur. Eg 40% of the units calling at any one time, max cable run
30 metres or maximum 12 current units per spur.
The following table shows the number of
‘Current Units’ for each piece of equipment
Device Description No of
Units
L622
Standard Call Point
1
L622M
Magnetic Call Point
1
L733
Door Monitoring Point
1
L634
I/O Module
1
CS1
Ceiling Pull Switch
0
SCP
Slave Call Point
0
L628
Larger LCD Display
4
L746
Overdoor Light
1
L746S
Light + Sounder
3
L714
Remote Sounder
4
L747
System Interface
4
RB1
Relay Board
2
PIR1
Passive Infra Red Unit
1
L722
Infra Red Call Point
1.5
L752
Audio Call Point
2.5
L758
Audio Displays Unit
4
L762
Audio Call/Disp Unit
2.5
Ceiling Pull switches &
Slave Call point connect to
the call point only
Additional Spines to other
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