IEC 60794-5-1 Optical fibre cables –
Family specification – Outdoor microduct optical fibre cables, microducts and protected microducts for installation by blowing
6 Microduct
6.1 Tests applicable
Tests shall be selected from Table 3, in accordance with the relevant product specification. If the microduct is only to be used in a protected microduct, some tests may not be relevant.
6.2 Tensile performance
a) Family requirements
Under visual examination without magnification there shall be no damage after the test and the microduct shall pass the inner clearance test (Annex E).
b) Test conditions
Method: Generally IEC 60794-1-21, Method E1
NOTE Use of IEC 60811-501 is under consideration.
Microduct length under tension:>1 m
Tensile load on microduct:1 × W
Duration of load:10 min
6.3 Crush
a) Family requirements
Under visual examination, without magnification, there shall be no damage to the microduct. After the recovery time, the microduct shall pass the inner clearance test (Annex E) and there shall be no splitting or permanent damage. The imprint of the plate is not considered as mechanical damage.
b) Test conditions
Method: IEC 60794-1-21, Method E3A
Sample length: 250 mm
Load (plate/plate):500 N
Duration time:1 min
Recovery time:1 h
6.4 Impact
a) Family requirements
Under visual examination without magnification there shall be no damage to the microducts. The microduct shall pass the inner clearance test (Annex E) and there shall be no splitting or permanent damage. The imprint of the striking surface on the microduct is not considered mechanical damage.
b) Test conditions
Method: IEC 60794-1-21, Method E4
Striking surface radius: 300 mm
Impact energy: 1 J
Recovery time:1 h
Number of impacts: One in 3 different places spread not less than 500 mm apart
6.5 Repeated bending
a) Family requirements
Under visual examination without magnification there shall be no damage to the microducts. The microduct shall pass the inner clearance test (Annex E) and there shall be no splitting or permanent damage.
b) Test conditions
Method:IEC 60794-1-21, Method E6
Bending diameter:40 × OD
Load:Adequate to assure uniform contact with the mandrel
Number of cycles:25
6.6 Torsion
a) Family requirements
Under visual examination without magnification there shall be no damage to the microducts. The microduct shall pass the inner clearance test (Annex E) and there shall be no splitting or permanent damage.
b) Test conditions
Method: IEC 60794-1-2, Method E7
Maximum gauge length: 2 m
6.7 Kink
a) Family requirements
Under visual examination, without magnification, there shall be no damage to the microducts after the test and shall pass the inner clearance test (Annex E). The microduct shall attain the required minimum diameter without kinking.
b) Test conditions
Method: IEC 60794-1-21, Method E10
Minimum diameter: 20 × OD
6.8 Bend
a) Family requirements
The outer and inner diameter of the microducts shall show, under visual examination without magnification, no damage and after the test and shall pass the inner clearance test (Annex E).
b) Test conditions
Method: IEC 60794-1-21, Method E11B
Diameter of mandrel: 40 × OD
Number of cycles: 3
6.9 Microduct route verification test
a) Family requirements
Objects of the required size can be passed through the microduct.
b) Test conditions
Method:IEC 60794-1-21, Method E23
6.10 Microduct pressure withstand
a) Family requirements
Under visual examination, without magnification, there shall be no damage to the microducts.
b) Test conditions
Method:IEC 60794-1-22, Method F13
All microducts shall resist an air pressure of at least 2,5 × the installation pressure at a temperature of 20 °C for a period of 0,5 h.
All microducts shall resist a proof test pressure of at least 1,3 × the installation pressure at a temperature of 40 °C for a period of 24 h.
6.11 Ageing
a) Family requirements
Tests to be performed after the aging period should be agreed between the customer and supplier and may include dimensions, inner clearance test, shrinkage, changes to surface finish, pressurization or installation test of the microduct cable.
b) Test conditions
Method: Under consideration
Ageing condition: Under consideration (+60 °C for 3 months; 7 days at 70 °C; 7 days at 85 °C)