MULTIPLEX
Atmospheric Oil Mist Detection System
AM8/JANUARY 2015
EMAIL [email protected] WEBSITE www.oilmist.com 4 East Barnet Road, London, England, EN4 8RW TEL +44 (0)20 7328 3121
Installation
Part2-10
CABLE SPECIFICATIONS
For the following connection we RECOMMEND THE MINIMUM TYPE AND SIZE as
follows:
Halogen free instrumentation, control and communication cable for fixed installation in
ships or equivalent appropriate specifications for application.
Conductor:
Standard copper conductor, annealed, IEC228 CLASS 2
Insulation:
According to appropriate standards
Pairs:
Two core twisted cable size 1 x 4 x 0.5mm
2
or 0.75mm
2
Stranding:
Pairs stranded together
Screening:
Braid of Annealed Copper Wires. Filler tape under braid
Connector Connection
Number of conductors and Cross section
(n x mm
2
)
1
Monitor to
Junction Box
19 x 2 x 0.75mm
2
2
Monitor to Alarms
or Shutdown
(optional)
4 x 2 x 0.5mm
2
3
Monitor to Main
Alarm
4 x 2 x 0.5mm
2
4
Monitor Power
3 x 1.5mm
2
rating Minimum 3A LNE (LN ) not
twisted
Junction Box to
Sensors
4 x 2 x 0.5mm
2
(for lengths over 100m,
0.75mm
2
size wire should be used)
Power to Junction
Box
3 x 1.5mm
2
rating Minimum 3A LNE (LN ) not
twisted
Example supplier: Helkama of Finland (LKM - HF for 3 x 1.5 power cable) and RFE -
HF for 4 x 2 x 0.5mm
2
twisted connection cables.
WIRING OF ALARM
If wiring just one side of each relay is either open or closed, use 6 cores.
If both sides of relay are being wired 9 cores will be required.
EARTHING OF SENSORS
The screen is normally connected to Pin 5. No earth should be made at the Sensor
end as this could result in ground loops. Earths made to any other point from the
screen wire between Monitor and Sensor will be ineffective and could cause additional
interference.
W
W
