EP0858244B1 - Field free electrical floor heating cable - Google Patents
Field free electrical floor heating cable Download PDFInfo
- Publication number
- EP0858244B1 EP0858244B1 EP19970120263 EP97120263A EP0858244B1 EP 0858244 B1 EP0858244 B1 EP 0858244B1 EP 19970120263 EP19970120263 EP 19970120263 EP 97120263 A EP97120263 A EP 97120263A EP 0858244 B1 EP0858244 B1 EP 0858244B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- sheath
- cable
- conductors
- conductor
- cable according
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Images
Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B3/00—Ohmic-resistance heating
- H05B3/40—Heating elements having the shape of rods or tubes
- H05B3/54—Heating elements having the shape of rods or tubes flexible
- H05B3/56—Heating cables
Definitions
- the present invention relates to electrical floor heating cables and in particular to cables generating acceptably small electromagnetic fields.
- the magnetic field is best reduced/eliminated by a concentric shield, as in coaxial cables, but this is not a practical solution with heating cables.
- the field generation problem can also be somewhat reduced by using two-conductor cables instead of single-conductor cables because the fields generated from the two conductors tend to eliminate each other.
- the fields from two-conductor cables having a resistance conductor and a return conductor should - however - be further reduced.
- the object of the present invention is to reduce the field generating properties of electrical floor heating cable having a first, near end and a second, far end and comprising within an outer protective sheath a cable core consisting of
- WO 92 08036 A discloses an electrical heating cable comprising within an outer protective sheath a cable core consisting of: a central resitance conductor, a concentrical sheath of insulation material return conductor means arranged to be interconnected with the resistance conductor in a far end of the cable and consisting of at least two separate conductors.
- the present invention is characterised in that the return conductors are embedded in a second insulation sheath arranged over said first sheath.
- a resistance conductor 1 is provided with a first concentrial sheath 2 of insulation material such as crosslinked polyethylene. All embodiments have an outer protective sheath 4 of PVC or other suitable material and an earth screen 7 in contact with earth means 6 or 20.
- the earth screen could be a conventional Al/PE tape in contact with Cu wires 6 or 20.
- the resistance conductor can be substituted with a cold end copper conductor.
- Return conductors 5;10,11;15,16,17 are embedded in a second common insulation sheath 3 arranged over the resistance conductor sheath 2.
- the sheath 3 could be a PVC sheath.
- the return conductor means is divided into three separate conductors 5a, 5b and 5c which are distributed in the cable core.
- the return conductors means is constituted by two conductors 10 and 11 arranged 180° apart whereas in Figure 3 there are three conductors 15, 16 and 17 arranged 120° apart.
- the return conductors 5 are arranged 90° apart.
- an earth wire 6 is arranged in a slot in the second common insulation sheath 3
- the earth conductor 20 is arranged as a group of conductors between the sheath 3 and the earth screen 7 and covering 10 - 25 % of the sheath surface.
- All elements of the cable are preferably arranged in parallel with the cable axis, thereby avoiding stranding operations.
Description
- The present invention relates to electrical floor heating cables and in particular to cables generating acceptably small electromagnetic fields. In general the magnetic field is best reduced/eliminated by a concentric shield, as in coaxial cables, but this is not a practical solution with heating cables. The field generation problem can also be somewhat reduced by using two-conductor cables instead of single-conductor cables because the fields generated from the two conductors tend to eliminate each other. The fields from two-conductor cables having a resistance conductor and a return conductor should - however - be further reduced.
- The object of the present invention is to reduce the field generating properties of electrical floor heating cable having a first, near end and a second, far end and comprising within an outer protective sheath a cable core consisting of
- a central resistance conductor,
- a first concentrical sheath of insulation material surrounding the resistance conductor, - as well as
- return conductor means arranged to be interconnected with the resistance conductor in the far end of the cable.
- The main features of the invention appears from the accompanying claims. The problem of eliminating or greatly reducing generation of electromagnetic fields which could be harmful to human beings occupying rooms heated with electrical floor heating cables has been solved by letting the return conductor means consist of at least two separate conductors which are distributed in the cable core. The electromagnetic field is reduced to about 1% of the field experienced from single conductor heating cables, and to some 10% of the fields from normal two conductor cables.
- The prior art document WO 92 08036 A discloses an electrical heating cable comprising within an outer protective sheath a cable core consisting of: a central resitance conductor, a concentrical sheath of insulation material return conductor means arranged to be interconnected with the resistance conductor in a far end of the cable and consisting of at least two separate conductors.
- The present invention is characterised in that the return conductors are embedded in a second insulation sheath arranged over said first sheath.
- Above mentioned and other features and objects of the present invention will clearly appear from the following detailed description of embodiments of the invention taken in conjunction with the drawings, where
- Figures 1-4 show four embodiments of the invention.
-
- In Figure 1 to 4 a
resistance conductor 1 is provided with a firstconcentrial sheath 2 of insulation material such as crosslinked polyethylene. All embodiments have an outerprotective sheath 4 of PVC or other suitable material and anearth screen 7 in contact with earth means 6 or 20. The earth screen could be a conventional Al/PE tape in contact withCu wires conductors 5;10,11;15,16,17 are embedded in a secondcommon insulation sheath 3 arranged over theresistance conductor sheath 2. Thesheath 3 could be a PVC sheath. - In Figure 1 the return conductor means is divided into three
separate conductors conductors conductors return conductors 5 are arranged 90° apart. - In Figures 1-3 an
earth wire 6 is arranged in a slot in the secondcommon insulation sheath 3, whereas in Figure 4 theearth conductor 20 is arranged as a group of conductors between thesheath 3 and theearth screen 7 and covering 10 - 25 % of the sheath surface. - All elements of the cable are preferably arranged in parallel with the cable axis, thereby avoiding stranding operations.
Claims (9)
- Electrical floor heating cable having a first, near end and a second, far end and comprising within an outer protective sheath (4) a cable core consisting ofa central resistance conductor (1),a first concentrical sheath of insulation material (2) surrounding the resistance conductor, as well asreturn conductor means (5) arranged to be interconnected with the resistance conductor in the far end of the cable,
characterized in that the return conductors are embedded in a second common insulation sheath (3) arranged over the said first sheath (2). - Cable according to claim 1, characterized in that the return conductors are arranged in contact with the said first sheath (2).
- Cable according to claim 1 or 2, characterized in that the return conductors are evently distributed around the said first sheath, such as two conductors 180° apart or three conductors 120° apart or four conductors 90° apart.
- Cable according to claim 1 or 2, characterized in that the return conductors include three conductors arranged 90° apart from each other and from an earth wire (6).
- Cable according to claim 1, characterized in that the said second common insulation sheath (3) is provided with a slot (8) for receiving an earth wire (6) which is in contact with an earth screen (7).
- Cable according to claim 1, characterized in that it includes a number of earth wires (20) arranged around the said second common insulation sheath (3) in contact with an earth screen (7).
- Cable according to claim 6, characterized in that the earth wires (20) are arranged as a group around the said second sheath (3) covering 10 to 25% of the sheath surface.
- Cable according to claim 1, characterized in that all the elements of the cable are arranged in parallel with the cable axis.
- Cable according to claim 1, characterized in that in the near end of the cable the resistance conductor is substituted with a cold end copper conductor.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NO970531 | 1997-02-06 | ||
NO970531A NO304000B1 (en) | 1997-02-06 | 1997-02-06 | Heating cable |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0858244A2 EP0858244A2 (en) | 1998-08-12 |
EP0858244A3 EP0858244A3 (en) | 1998-09-30 |
EP0858244B1 true EP0858244B1 (en) | 2003-01-22 |
Family
ID=19900351
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19970120263 Expired - Lifetime EP0858244B1 (en) | 1997-02-06 | 1997-11-19 | Field free electrical floor heating cable |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0858244B1 (en) |
DE (1) | DE69718614T2 (en) |
NO (1) | NO304000B1 (en) |
PL (1) | PL324632A1 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NO321923B1 (en) | 2004-12-27 | 2006-07-24 | Nexans | Heating cable |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2519505A1 (en) * | 1981-12-31 | 1983-07-08 | Thomson Jeumont Cables | Earthing screen for electrical resistance heating wire - being combination of conductive wire and annular strip |
DE8901603U1 (en) * | 1989-02-11 | 1989-03-30 | Wilhelm Wetzel Gmbh & Co., 4019 Monheim, De | |
WO1992008036A1 (en) * | 1990-10-30 | 1992-05-14 | Semen Zinovievich Erukhimovich | Device to eliminate and prevent deposition of paraffin and hydrates in wells |
JPH07176372A (en) * | 1993-12-21 | 1995-07-14 | Mitsubishi Cable Ind Ltd | Heating cable and heating unit |
KR0184360B1 (en) * | 1995-11-07 | 1999-05-15 | 박일영 | Cord and heating wire |
DE29613341U1 (en) * | 1996-08-01 | 1996-09-19 | Wilhelm Friedrich | Current conductor and plug connectable with this |
-
1997
- 1997-02-06 NO NO970531A patent/NO304000B1/en not_active IP Right Cessation
- 1997-11-19 DE DE1997618614 patent/DE69718614T2/en not_active Expired - Fee Related
- 1997-11-19 EP EP19970120263 patent/EP0858244B1/en not_active Expired - Lifetime
-
1998
- 1998-02-04 PL PL32463298A patent/PL324632A1/en unknown
Also Published As
Publication number | Publication date |
---|---|
EP0858244A3 (en) | 1998-09-30 |
NO970531L (en) | 1998-08-07 |
EP0858244A2 (en) | 1998-08-12 |
DE69718614T2 (en) | 2003-05-22 |
NO970531D0 (en) | 1997-02-06 |
DE69718614D1 (en) | 2003-02-27 |
PL324632A1 (en) | 1998-08-17 |
NO304000B1 (en) | 1998-10-05 |
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