Metal armors are used for cables destined to direct burial applications, or if mechanical protection is required. The following factors must be considered:
- Required tensile load
- Estimated pressure on cable while using it
- Protection against rodents
- Accidental damage protection
- Minimum bending radius required
Single layer of galvanized steel wires, with diameters according to relevant standards, coverage min. 90%. This armor assures a very good mechanical protection and tensile strength.
Galvanized steel wire braid, single wire diameter: 0.20-0.25-0.30-0.40 mm. This armor guarantees mechanical resistance, allowing a smaller radius of curvature than the other types.
Reinforcement with galvanized steel strips, composed by two overlapped strips; thickness of each tape: 0.20 – 0.30 – 0.40 mm, according to the cable diameter. It grants a coverage > 100%, an excellent impact resistance but low tensile load.
Galvanized steel flat armor is composed of flat wires 0.6 mm or 0.8 mm thick, it is similar to the SWA, but with higher mechanical protection.
A2 - Aramide Yarn Armor
It consists in a layer made of aramidic yarns helically or longitudinally applied around the cable cord. This solution is adopted for totally dielectric cables, such as the aerial cables, that, besides the light weight, are characterized by high traction resistance and ballistic protection (when combined with aramidic tape).
A3 - Corrugated Steel Tape
Laminated corrugated steel tape applied in a longitudinal way, close on its own and bonded to the sheath. It is applied as anti-rodent protection and as protection against cable deflection for cables that can be directly buried.
A5 - Glass Yarn Armour
Dielectric armouring in glass yarns with high traction resistance and with anti-rodent protecting function.
Besides mechanical protections, there are special protections for particular installations:
Water blocking tapes, also called water swellable tapes
A8 - Copolymer Coated Aluminum Tape
It consists of a laminated aluminum tape applied longitudinally, closed and bonded on its own and on the sheath.
Aramid and glass fibers that swell upon contact with water.
A4 - Polyamide protection
This protection assures an anti-rodent and anti-termite function in dielectric cables.
It is applied between two other sheaths and is the best protection against aggressive chemicals. This is an expensive solution, increases weight and bending radius. It presents poor vibration resistance and normally an armor is required to protect it from crushing.
It is an alternative to lead sheath and it is composed by a longitudinal overlapped aluminum copolimer coated tape, placed longitudinally and adhering to a HDPE coating and an additional special polyamide / polypropylene sheath.
- Excellent protection against corrosion and humidity
- Excellent impact resistance that, in some cases, prevents the use of the armor
This protection has a lower weight compared to lead sheath, cables have a smaller diameter, with a reduction of costs.
Hi-Pack is the right choice to protect the environment.