Moisture mitigation in premise cables
View Patent ↗Premise cables for installation in indoor environments, such as risers and plenums, are described. A premise cable may include an outer jacket and at least one twisted pair of individually insulated conductors positioned within a cable core defined by the jacket. Moisture mitigation material is positioned between an outer surface of the jacket and the twisted pair(s), for example, within the cable core. The moisture mitigation material is configured to absorb water vapor that penetrates the jacket, thereby improving electrical performance of the cable. However, the moisture mitigation material does not provide water blocking for the cable.
1. A premise cable comprising:
a jacket defining a cable core;
a plurality of twisted pairs of individually insulated conductors positioned within the cable core; and
moisture mitigation material positioned loosely within the cable core and free to migrate within the interstices between the plurality of twisted pairs, the moisture mitigation material configured to absorb water vapor that penetrates the jacket when the cable is installed in an indoor environment,
wherein the moisture mitigation material does not block the migration of liquid water along the cable in a longitudinal direction.
2. The premise cable of claim 1 , wherein the moisture mitigation material lowers the humidity within the cable core relative to the humidity outside the jacket.
3. The premise cable of claim 1 , wherein the moisture mitigation material comprises a desiccant.
4. The premise cable of claim 1 , wherein the moisture mitigation material comprises at least one of (i) calcium sulfate, (ii) silica gel, or (iii) sodium polyacrylate.
5. The premise cable of claim 1 , wherein the moisture mitigation material is positioned at a plurality of discrete locations along a longitudinal length of the cable.
6. The premise cable of claim 5 , further comprising one or more dams respectively positioned at discrete locations along the longitudinal length of the cable.
7. The premise cable of claim 1 , wherein the moisture mitigation material comprises one of (i) an absorbent polymer or (ii) a superabsorbent polymer.
8. The premise cable of claim 1 , wherein the moisture mitigation material comprises at least one of (i) a water absorbent yarn or (ii) a molecular sieve.
9. The premise cable of claim 1 , wherein the premise cable satisfies at least one flame retardancy standard or burn standard for premise cables.
10. A premise cable configured for installation in an indoor environment, the premise cable comprising:
a jacket defining a cable core;
a plurality of individually insulated conductors positioned within the cable core;
moisture mitigation material positioned within the cable core and free to contact the plurality of conductors, the moisture mitigation material comprising a desiccant that absorbs water vapor that penetrates the jacket.
11. The premise cable of claim 10 , wherein the moisture mitigation material fails to block the migration of liquid water within the cable core along a longitudinal direction.
12. The premise cable of claim 10 , wherein the moisture mitigation material lowers the humidity within the cable core relative to the humidity outside the jacket.
13. The premise cable of claim 10 , wherein the moisture mitigation material is loosely positioned within the cable core.
14. The premise cable of claim 10 , wherein the moisture mitigation material is affixed to a substrate layer positioned between the jacket and the plurality of twisted pairs.
15. The premise cable of claim 10 , wherein the premise cable satisfies at least one flame retardancy standard or burn standard for premise cables.
16. A premise cable comprising:
at least one twisted pair of individually insulated electrical conductors positioned within an opening defined by a cable jacket; and
moisture mitigation material positioned within the opening and free to contact the at least one twisted pair, the moisture mitigation material configured to regulate the humidity within the opening in the event that water vapor penetrates the cable jacket.
17. The premise cable of claim 16 , wherein the moisture mitigation material is configured to absorb water vapor that penetrates the jacket when the cable is installed in an indoor environment, and
wherein the moisture mitigation material does not block the migration of liquid water along the cable in a longitudinal direction.
18. The premise cable of claim 16 , wherein the moisture mitigation material comprises one of (i) calcium sulfate, (ii) silica gel, or (iii) sodium polyacrylate.
19. The premise cable of claim 16 , wherein the moisture mitigation material is loosely positioned within the cable core.
20. The premise cable of claim 16 , wherein the premise cable satisfies at least one flame retardancy standard or burn standard for premise cables.