Twinflex V3 Control Panel Engineering and Commissioning Manual
50
Cable Continuity & Insulation Test Results
After installation of the cable, and termination into all the relevant back-boxes, install a wire link between
the zone +ve and –ve connections at the last device in order to be able to take cable continuity readings,
removing it to take insulation readings. Make sure that all the cables are dressed smoothly and neatly into
their back-boxes in order that they will not be disturbed after the readings are taken.
The commissioning engineer will require these readings, along with correctly marked ‘as-wired’ drawings,
before attending site to commission the system.
Core Continuity Reading (ohms)
Z1 Z2 Z3 Z4 Z5 Z6 Z7 Z8
Zone +ve to –ve with a temporary link
at the last device.
Sounder circuit +ve to -ve with a
temporary link at the last device.
Others . .
A reading of approximately 1 ohm per 100 metres of 1.5 mm
2
cable is expected and any significant
variation from this should be investigated. If the above readings are satisfactorily showing circuit continuity
then you may also take the reading below, remembering to remove your temporary link at the last device.
Core Insulation Reading ( M ohms)
Z1 Z2 Z3 Z4 Z5 Z6 Z7 Z8
+ve to -ve
+ve to Earth
-ve to Earth
Screen to mains Earth: with scrn
disconnected from panel
Others . .
A reading in excess of 1 M ohm is expected and any significant variation from this should be investigated.
If the readings are satisfactory then the loop wiring is largely proven other than for faults such as complete
polarity reversal.
Site Name & Address:
Installation Company:
Testing Engineer:
Signature:
Date:
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