71-50-03 Engine harness routing
Ensure that wires and cables are routed in such a manner that chafing will not occur against the
engine or other components.
Ensure that wires and cables are routed in such a manner that in no circumstances a contact to
extreme hot engine areas (exhaust pipes) is possible to prevent insulation break down.
Where practical, route electrical wires and cables above fluid lines and provide at least a 50 mm
separation from any flammable liquid fuel line or other low voltage wiring that enters a fuel tank and
requires electrical isolation to prevent an ignition hazard.
Ensure that a trap or drip loop is provided to prevent fluids or condensed moisture from running into
wires and cables dressed downward to a connector, terminal or junction box.
The minimum radius of bends in wire groups or bundles must not be less than 10 times the outside
diameter of the largest wire or cable.
For harness branches of diameters less than 2 cm which connect to a one actuator or one sensor a
different rule applies.
The minimum radius of the wire connecting one sensor or one actuator is 3 times the diameter of the
wire or cable.
Also where the wire is suitable supported, the radius may be 3 times the diameter of the wire or
cable. Where it is not practical to install wiring or cables within the radius requirements, the bend
should be enclosed in insulating tubing.
Ensure that wires and cables that are attached to assemblies where relative movement occurs
(rotating pieces) are installed or protected in such a manner as to prevent deterioration of the wires
and cables caused by the relative movements of the assembled parts.
Ensure that wires and cables are provided with enough slack to meet following requirements:
ï‚· Permit ease of maintenance
ï‚· Prevent mechanical strain on the wires, cables, junctions and supports
ï‚· Permit free movement of shock and vibrations mounted equipment
ï‚· Allow shifting of equipment, as necessary, to perform alignment, servicing tuning, removal of
covers and changing of internal components while installed on engine
Ensure that unused wires are individually dead-ended, tied into bundle and secured to a permanent
structure.
Each wire should have conductor strands cut even with the insulation. (no blank conductor strand
accessible).
The end of the wire shall be covered (electrically isolating) with an connector or a 25 mm piece of
insulating tubing placed over the wire with its end folded back and tied.
Wires and cables are properly supported and bound so that there is no interference with other wires,
cables and equipment.
Wires and cables are adequately supported to prevent excessive movement in areas of high vibration.
Insulating tubing and abrasion protection is secured by tying tie straps or with clamps.
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