Low smoke, zero halogen self-regulating heating cable
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.
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.