Cable Specifications - Quality Monitoring Instruments QMI MULTIPLEX Manual

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.
Conductor: Standard copper conductor, annealed, IEC228 CLASS 2
Halogen free flame retardant polyolefine
Insulation:
Pairs: Two core twisted together cable size 1 x 4 x 0.5mm
Stranding: Pairs stranded together
Screening: Braid of Annealed Copper Wires. Filler tape under braid
See drawings QMI-05-1092 Part 1-4 and QMI-05-1096 Part 1-5.
Monitor
Connector
1 Monitor to Junction Box
2 Monitor to Shutdown
3 Monitor to Alarm
4 Power to Monitor
5 Monitor to Datalogger
N/A Junction Box to Detector
N/A Junction Box to Fan Fail
WIRING OF ALARM
If wiring just one side of each relay - open or closed, use 6 cores.
If both sides of relay are being wired 9 cores will be required.
EARTHING OF DETECTOR HEADS
The screen is normally connected to Pin 5 (see drawing QMI-05-1100 Part 2-15).
No earth should be made at the Detector Head end as this could result in ground loops.
Earths made to any other point from the screen wire between Monitor and Detector Head will
be ineffective and could cause additional interference.
EARTHING OF JUNCTION BOX
It is very important that the Junction Box is earthed using an earth lug on the lid or in the box.
IF BOTH ATMOSPHERIC AND ENGINE DETECTORS ARE BEING USED
All the specifications are the same as for the Engine Detection System except that the cable
from the Junction Box to the Atmospheric Detector is 3 x 2 x 0.5mm
Junction Box to Fan fail is omitted.
Installation Part2-12
EMAIL qmi@oilmist.com WEBSITE www.oilmist.com 4 East Barnet Road, London, EN4 8RW, UK. TEL +44 (0)20 7328 3121
Engine Oil Mist Detection System
MULTIPLEX
Connection
19 x 2 x 0.75 (for less than 10
Detectors – see Part 2-12)
2 x 2 x 0.5 - same as Detector
4 x 2 x 0.5 or 7 x 2 x 0.5 - see below
3 x 1.5 rating min. 3A (L.N.E.) - not
twisted
7 x 2 x 0.5
2 x 2 x 0.5 (for lengths over 100
metres, 0.75 size wire should be used)
2 x 2 x 0.5
or 0.75mm
2
No. of Conductors and Cross Section (mm
2
)
2
and the cable from the
2
EM6/March 2015