Project requirements · Water
Longitudinal watertightness
Water that enters at a damaged point does not travel along the cable (screen area and/or conductor).
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Constructions that meet it
- Swelling tapes over and under the metal screen: changes the cable's layers. Swelling tapes over and under the metal screen (semiconductive or non-conductive swelling tape). Drawbacks: Thin; slight diameter increase.
- Watertight conductor (swelling powder or yarn): changes no layer: a property of the conductor. Watertight conductor: swelling powder or yarns between wires, swelling tape over the conductor (swelling yarn / powder / tape). Drawbacks: Inside the conductor, so not visible except the tape over it.
- Swelling yarns in the interstices: changes the cable's layers. Swelling yarns or tapes in the interstices of multicore cables (swelling yarn).
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Tests
- IEC 60502-2:2014 clause 19.24 and Annex F: water penetration test. Pass: Annex F requirements (values not read)
- HD 620 / IEC 60840 (HV): water penetration test of the product standard. Pass: not read
In the base standard for some designs: IEC 60502-2:2014 clause 19.24 and Annex F, water penetration test, for designs with a barrier against longitudinal water.
How specifications state it
IEC 60502-2 includes designs with longitudinal barriers and their test; specifications say 'longitudinally watertight (screen / conductor) acc. to Annex F'.
Where it is asked for
- MV and HV buried networks
- wet ducts
- utilities in Germany, Nordics, Netherlands
Sources
- IEC 60502-2:2014 Ed.3 preview: scope (designs with barriers against longitudinal water penetration and an associated test), contents 19.24 and Annex F (read in the standard)
- Lapp N2XS(FL)2Y datasheet (water blocking tape; Al/PE laminate) (quoted by others)
- Waskönig+Walter N2XS(FL)2Y 20 kV (laminated sheath yes; water blocking screen yes; conductor no) (quoted by others)