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Survey the underground risk
Record soil and rock, water level, flooding, termites or rodents observed locally, agricultural digging, road crossings, mining activity, fire exposure, trench depth and repair access. Separate direct burial from protected duct installation. African routes are not one environment; a wet coastal settlement, dry savannah and mine site need different risk controls.
Choose the installation system first
A sound duct with sealed chambers can reduce direct mechanical exposure and support replacement. Direct burial avoids duct cost but makes armour, sheath, trench preparation, warning tape and route protection more important. In either case, local civil-work rules and operator practices control depth, separation and crossing details.
Understand what armour changes
Corrugated steel tape, double sheaths or steel wires can improve resistance to crushing, impact and some animal damage, depending on construction. They also add diameter, weight, bend requirements and metallic considerations. Ask for the actual cross-section and bill of materials. A model name such as GYTA53 or GYTS53 is not a universal performance guarantee.
Consider non-metallic strategies where required
Some routes require an all-dielectric construction because of electrical, lightning, corrosion or installation policy. Non-metallic protective elements and route barriers can be evaluated, but their behaviour differs from steel. Do not describe either option as absolutely rodent-proof. Define the expected risk and required tests or field controls.
Control water and sheath performance
Specify loose-tube filling or dry water blocking, cable-core blocking, moisture barriers and inner and outer sheath materials as needed. Review water-penetration and environmental evidence against the applicable cable standard and contract. Good armour without controlled water blocking can still leave an underground network vulnerable after sheath damage.
Compare mechanical data on the same basis
Request tensile, crush, impact, bending, diameter, weight and temperature values with the stated test method and acceptance criteria. Check pulling section, winch limits, rollers, bends and drum handling. A heavier armoured cable may require different equipment and shorter drums, so compare installed risk and cost rather than price per kilometre alone.
Plan joints, markers and maintenance
Locate closures outside flooded or high-traffic points where possible, provide slack and protected chambers, mark the route and retain drum-to-section records. Include warning tape, marker posts, duct plugs, grounding components where applicable and restoration spares in the BOM. Maintenance access is part of cable selection.
Data to send for a protected underground cable
Provide country and route, duct or direct burial, trench and crossing details, soil and water conditions, observed rodent risk, electrical restrictions, fibre count, pulling lengths, drum plan, sheath and armour preference, standards, tests, destination and installation equipment. The supplier should identify limitations and avoid absolute anti-rodent claims.