IEC 60794-3-11:2010 pdf – Optical fibre cables – Part 3-11: Outdoor cables – Product specification for duct, directly buried, andlashed aerial single-mode optical fibre telecommunication cables.
7.2.3 Cable length marking
Unless otherwise agreed, the difference between the length shown by the length marker and the actual length shall not be more than – % of the actual length (that Is the actual cable length shall always be equal to or longer than the marked length). Other tolerances can be allowed provided the cable length is assured by other means.
The cable shall have sequentially numbered length markings on the sheath at 1 m intervals. Alternate length marking Is also acceptable. The length marking shall not be reset to zero for the entire length of cable. The length marking can start with a value different from zero.
It agreed between the customer and the supplier, cables may be re-marked in accordance with the following.
Defective marking may be removed and the cable re-marked with the same colour.
Alternatively, the defective marking may remain and the cable re-marked, using preferably a yellow marking on a different portion of the circumference. This marking shall meet all of the original requirements. Any cable that contains two sets of cable markings shall be labelled to Indicate the colour of the marking to be considered.
7.3 Cable core materials
7.3.1 Tube filling compound material (it required)
The lube filling compouna. if used, shall Comply with IEC 60794-1-2, metnod E15. The following acceptance criteria apply:
— bleeding: 2 %:
— evaporation: 0.5 %, at 80 °C;
— duration: 24 h.
7.3.2 Water-blocking material
Dry water blocking materials and/or compounds may be used to ensure water-tightness of the cable core. Flooding compound may also be used as the water blocking material in the cable core.
Filling and water-blocking material flow:
A representative sample of cable shall be tested in accordance with IEC 60794-1 -2. method
E14. The tilling and water-blocking materials shall not flow at or below 70 C.
7.3.3 Cable material compatibility
The compatibility of fibre coating and tube filling material shall be tested in accordance with lEG 60794.1.2, method E5.
7.3.4 Tube material
The tube shall be such that the fibres maintain their performance under operating conditions. Handling requirements for buffer tubes shall be agreed upon by the customer and the supplier.
7.4 Cable sheath
7.4.1 Sheath material
The recommended sheath material is UV-resistant black polyethylene. Other suitable materials can be considered.
7.4.2 Sheath thickness
Unless otherwise agreed, the minimum outer sheath thickness at any spot shall meet the below criteria:
a) Outer sheath of mulhple-acket cables: 0,8 mm
b) Outer sheath of single jacket unarmoured cables: 0.9 mm.
C) Outer sheath of single jacket armour cables: 1.0 mm.
d) Outer sheath over embedded strength members: 0.4 mm over embedded strength members.
For special applications, other sheath thickness may be chosen when agreed between the customer and the supplier.
The test method shall be as given in lEG 60811-1-1 (end sample measurement).
7.4.3 Outer cable dIameter
The outer diameter of the cable shall be measured in accordance with lEG 60811-1-1 and shall not exceed the supplier’s stated maximum.
7.4.4 MoIsture barrier
If required, additional moisture protection shall be provided by a tape. If the tape is metallic it shall be coated on at least one side with a polymer film with a sufficient longitudinal overlap and bonded to the sheath. The adhesion of the metallic tape to the sheath shall be tested in accordance with IEC 60708.
The nominal thickness of the tape, excluding the polymer layer(s), shall be sufficient to prevent ingress of moisture.
7.4.5 Rodent resistant barrier
If required, additional protection layers shall be applied over the cable core. Protective barriers shall use materials of sufficient design and thickness to meet rodent resistance requirements as agreed upon by customer and supplier.
7.5 Mechanical requirements
7.5.1 General
For directly buried or armoured cables, the mechanical requirement could be adapted by
agreement between the customer and the supplier.
7.5.2 Bend
The cable shall be tested in accordance with IEC 60794-1 -2, method Eli.
a) Detail requirements.