Low smoke, zero halogen self-regulating heating cable

Patent metadata

Field	Value
Publication number	US-11956865-B2
Application number	US-202318316178-A
Country	US
Kind code	B2
Filing date	May 11, 2023
Priority date	Feb 1, 2017
Publication date	Apr 9, 2024
Grant date	Apr 9, 2024

Abstract

A low smoke, zero halogen self-regulating heating cable includes a semi-conductive heating core and two conductive wires embedded within and separated by the semi-conductive heating core. The cable also includes a primary jacket surrounding the semi-conductive core, a braid surrounding the primary jacket, and a final jacket surrounding the braid. At least one of the primary jacket and the final jacket includes a low smoke, zero halogen material.

First claim

The invention claimed is:

1. A self-regulating heating cable comprising:
a semi-conductive heating core;
two conductive wires embedded within and separated by the semi-conductive heating core;
a primary jacket surrounding the semi-conductive core and comprising a first low-smoke, zero halogen (LSZH) material;
a braid surrounding the primary jacket and providing a ground path; and
a final jacket surrounding the braid and comprising a second LSZH material;
the first LSZH material and the second LSZH material each comprising polyolefin flame-retarded with inorganic hydrated mineral fillers;
the first LSZH material being substantially the same as the second LSZH material.

2. The self-regulating heating cable of claim 1 , wherein the primary jacket is cross-linked and the final jacket is not cross-linked.

3. The self-regulating heating cable of claim 1 , wherein the primary jacket is not cross-linked and the final jacket is cross-linked.

4. The self-regulating heating cable of claim 1 , wherein the primary jacket and the final jacket are both cross-linked.

5. The self-regulating heating cable of claim 1 , wherein neither of the primary jacket and the final jacket are cross-linked.

6. The self-regulating heating cable of claim 1 , wherein the inorganic hydrated mineral fillers include at least one of aluminum trihydrate and magnesium hydroxide.

7. The self-regulating heating cable of claim 1 , wherein the first and second LSZH materials are configured to have respective thermal conductivities that enable the self-regulating heating cable to produce a power output of about 10 Watts per meter (W/m) to about 31 W/m when at about 5 degrees Celsius to about 10 degrees Celsius.

8. The self-regulating heating cable of claim 1 , wherein the first and second LSZH materials are sufficiently flame-retardant that at least 60% of light incident upon smoke emitted by burning the self-regulating heating cable of a smoke density defined in International Electrotechnical Commission (IEC) standard 61034 is transmitted through the smoke.

9. The self-regulating heating cable of claim 1 , wherein at least one of the semi-conductive heating core, the primary jacket, and the final jacket are cross-linked.

10. A self-regulating heating cable comprising:
a semi-conductive heating core;
two conductive wires embedded within and separated by the semi-conductive heating core;
a primary jacket surrounding the semi-conductive core and comprising a first low-smoke, zero halogen (LSZH) material;
a braid surrounding the primary jacket and providing a ground path; and
a final jacket surrounding the braid and comprising a second LSZH material;
the first LSZH material and the second LSZH material each comprising polyolefin flame-retarded with inorganic hydrated mineral fillers;
the first LSZH material being different from the second LSZH material.

11. The self-regulating heating cable of claim 10 , wherein the primary jacket is cross-linked and the final jacket is not cross-linked.

12. The self-regulating heating cable of claim 10 , wherein the primary jacket is not cross-linked and the final jacket is cross-linked.

13. The self-regulating heating cable of claim 10 , wherein the primary jacket and the final jacket are both cross-linked.

14. The self-regulating heating cable of claim 10 , wherein neither of the primary jacket and the final jacket are cross-linked.

15. The self-regulating heating cable of claim 10 , wherein the inorganic hydrated mineral fillers include at least one of aluminum trihydrate and magnesium hydroxide.

16. The self-regulating heating cable of claim 10 , wherein the first and second LSZH materials are configured to have respective thermal conductivities that enable the self-regulating heating cable to produce a power output of about 10 Watts per meter (W/m) to about 31 W/m when at about 5 degrees Celsius to about 10 degrees Celsius.

17. The self-regulating heating cable of claim 10 , wherein the first and second LSZH materials are sufficiently flame-retardant that at least 60% of light incident upon smoke emitted by burning the self-regulating heating cable of a smoke density defined in International Electrotechnical Commission (IEC) standard 61034 is transmitted through the smoke.

18. The self-regulating heating cable of claim 10 , wherein at least one of the semi-conductive heating core, the primary jacket, and the final jacket are cross-linked.

19. A self-regulating heating cable comprising:
a semi-conductive heating core;
two conductive wires embedded within and separated by the semi-conductive heating core;
a primary jacket surrounding the semi-conductive core and comprising a first low-smoke, zero halogen (LSZH) material;
a braid surrounding the primary jacket and providing a ground path, the braid comprised of tinned-copper; and
a final jacket surrounding the braid and comprising a second LSZH material;
at least one of the first LSZH material and the second LSZH material comprising polyolefin flame-retarded with magnesium hydroxide.

20. The self-regulating heating cable of claim 19 , wherein the primary jacket is cross-linked and the final jacket is not cross-linked.

21. The self-regulating heating cable of claim 19 , wherein the primary jacket is not cross-linked and the final jacket is cross-linked.

22. The self-regulating heating cable of claim 19 , wherein the primary jacket and the final jacket are both cross-linked.

23. The self-regulating heating cable of claim 19 , wherein neither of the primary jacket and the final jacket are cross-linked.

24. The self-regulating heating cable of claim 19 , wherein the first and second LSZH materials are configured to have respective thermal conductivities that enable the self-regulating heating cable to produce a power output of about 10 Watts per meter (W/m) to about 31 W/m when at about 5 degrees Celsius to about 10 degrees Celsius.

25. The self-regulating heating cable of claim 19 , wherein the first and second LSZH materials are sufficiently flame-retardant that at least 60% of light incident upon smoke emitted by burning the self-regulating heating cable of a smoke density defined in International Electrotechnical Commission (IEC) standard 61034 is transmitted through the smoke.

26. The self-regulating heating cable of claim 19 , wherein at least one of the semi-conductive heating core, the primary jacket, and the final jacket are cross-linked.

Assignees

• Nvent Services Gmbh

Inventors

• Jenkins Sirarpi Bicakci
• Jones Jonathan

Classifications

• H05B3/565 Primary

  flat cables · CPC title

• H01B1/02

  mainly consisting of metals or alloys · CPC title

• H01B7/0225

  Three or more layers · CPC title

• H01B7/28

  {Protection against damage caused} by moisture, corrosion, chemical attack or weather · CPC title

• H01B7/295

  using material resistant to flame · CPC title