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6.5 ELECTRICAL INSTALLATION GENERAL
CAUTION:
ALL CABLES MUST BE OF SUITABLE TYPE FOR THE PURPOSE INTENDED.
All cables should be run on cable trays and should be secured to the tray by clips which will not
damage the cable sheathing. Metal clips are not recommended, unless coated with a suitable buffer
material such as nylon or PVC.
All screened cables should be run on a separate cable tray, if possible.
Under all circumstances screened cables must be kept segregated from AC power cables, at a
minimum distance of 0,5m.
All cables passing through bulkheads should be led through an approved gastight bulkhead
penetration/gland.
To avoid signal fouling due to electromagnetic induction, all braided copper screens on the
screened cables should be connected at one end only, in the engine room. All exposed braids
should be suitably trimmed and finished so that all braids end inside the cable gland, and no braids
should enter into the cabinet.
NOTE:
Make sure the temperature rating of the cables connected to the EPU should at
least be 70ºC.
The supply cables connected to the EPU should be secured in such a way that no
connection can be made with the signal cables.
For correct installation a suitable isolation switch shall be installed in the supply line
as near as possible to the equipment. Maximum fuse current 16A.
Cable terminations for individual conductors should be finished with a pin terminal crimped on the
conductor.
Cables are not supplied by VAF Instruments, unless specifically ordered.
6.5.1 Electro Pneumatic Unit (EPU)
NOTE:
All wiring connected to EPU from the hazardous zone must be connected in
accordance with drawing 0806-0005 in order to ensure intrinsically safe circuits remain
safe.
The EPU is of a sheet steel construction, it is mounted onto a steel frame which carries the
pneumatic section of the assembly. It is normally situated in the engine room on the engine
room/pump room bulkhead, opposite the skid mounted in the pump room.
This unit has both electrical and pneumatic connections, the electrical cables being run through the
base of the cabinet to internal connectors. Suitable cable glands are provided for in the base of the
cabinet.
The pneumatic connections are located in the right hand side of the cabinet mounting plate and are
suitable for 6 mm O.D. and 10 mm O.D. pipe.
Mounting is by means of six holes drilled to accept 8 mm bolts.
Should the mounting side selected be subject to excessive vibration, anti-vibration pads or stiffeners
should be installed to reduce these vibrations to an acceptable level.
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