EP0770259B1 - Fils ignifuges - Google Patents
Fils ignifuges Download PDFInfo
- Publication number
- EP0770259B1 EP0770259B1 EP95924456A EP95924456A EP0770259B1 EP 0770259 B1 EP0770259 B1 EP 0770259B1 EP 95924456 A EP95924456 A EP 95924456A EP 95924456 A EP95924456 A EP 95924456A EP 0770259 B1 EP0770259 B1 EP 0770259B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- tape
- wire according
- less
- overlap
- under
- 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
Links
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
- H01B7/29—Protection against damage caused by extremes of temperature or by flame
- H01B7/295—Protection against damage caused by extremes of temperature or by flame using material resistant to flame
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
- H01B7/29—Protection against damage caused by extremes of temperature or by flame
Definitions
- This invention relates to fire-resistant wires capable of maintaining electrical circuit integrity when the wires, or cables containing them, are exposed to fire.
- EP-A-0 260 373 discloses an electric wire having a conductor carrying a copper underlayer over which is spirally wrapped an electrically insulating covering tape of inorganic fire-resistant material, with adjacent turns of the tape overlapping one another with an overlap of between 7% and 35% of the tape width.
- Mica paper reinforced by a backing material of woven glass or of polyethylene film is produced as tape that can be spirally wrapped onto electrical conductors to give a degree of fire resistance.
- the mica wrapped conductor is then normally coated with a conventional polymer to impart the required electrical/mechanical properties. In a fire, the polymer is destroyed but the electrical integrity of the cable is maintained by the mica layer and the insulating char from the polymer. It is generally understood that the more mica the better from a fire performance point of view and tapes are available with different weights of mica (e.g. 80, 120, 160g./m 2 )
- mica tapes are applied by spiral wrapping with an overlap of typically 30% to 50% (of tape width) to maintain protection when the wrapped conductor is flexed, since the overlaps tend to open on flexing.
- High overlaps are preferred to achieve the required degree of fire resistance. It is a problem that the thicker, heavier tapes are harder to wrap successfully, especially on small diameter conductors, leading to tape damage, wrinkling and a poor wrapped surface making subsequent processing more difficult and final appearance and/or performance of the wire less satisfactory. Therefore, if a higher level of fire protection is needed, the options are normally to increase the weight of the mica tape and suffer a deterioration in the wrap quality, or to apply 2 layers of tape giving a greater diameter.
- the successive turns of mica wrap M of perceived width W would have an overlap of exactly 50%, giving a double thickness of mica tape over the entire surface of the wire conductor C from a single wrap.
- this ideal overlap is difficult to achieve, and Sketch B indicates a more realistic result where gaps G occur, taking into account the finite thickness of the mica tape (M) which necessitates a lower degree of overlap to achieve a smooth wrap.
- Sketch C indicates a single wrap of mica tape M of perceived width W with an overlap (shaded) of about 33%.
- the perceived width W is slightly greater than the true width of the tape M owing to the spiral wrapping angle of the tape about the conductor axis.
- two mica tapes M1 and M2 are preferably used as indicated in Sketches D and E to ensure that at least two layers of the mica wrap are present at all points.
- Sketch F shows, with some exaggeration for clarity, the unevenness which occurs in these known wrappings of mica tape M on conductor C, and indicates the undesirable breakage of the brittle reinforcing fibres F (usually glass) which tends to occur due to stresses in the overlapped tapes.
- the present invention alleviates the aforementioned problems in surprisingly simple way.
- the invention provides an electrical wire having a conductor carrying at least one under-layer of electrically insulating fire-resistant material over which is spirally wrapped an electrically insulating covering tape of inorganic fire-resistant material with adjacent turns of the tape overlapping one another by less than 5%, preferably less than 3 %, of the tape width.
- the under-layer also comprises a tape of inorganic fire-resistant material spirally wrapped around (preferably in contact with) the conductor.
- the overlapping regions of the covering tape will preferably be positioned between the overlapping regions of the underlayer tape, so as to maintain protection on flexing of the wire which will tend to open the small overlaps of the covering tape.
- spiral is used herein in the sense of winding continually and advancing as if along a cylinder, the cylinder being in fact represented by the conductor in this invention, which is preferably of substantially circular cross-section although other cross-sections are not necessarily excluded.
- tape is used herein to refer to any elongate body of material capable of being spirally wrapped around a wire conductor, without limitation to any particular format, construction or materials except as specifically stated herein.
- This invention is especially useful for wires having a coating of organic polymer material of thickness less than 0.8 millimetre, preferably less than 0.6 mm, more preferably less than 5 mm, and especially less than 0.4 mm, overlying and preferably in contact with the outermost surface of the said wrapped tape(s).
- the adjacent turns of the underlayer tape overlap one another by not less than 2%, preferably not less than 4%, more preferably not less than 8%, of the respective tape width.
- the outer covering tape will have turns overlapping less than the turns of the underlayer tape(s).
- the preferred fibrous support of the covering tapes may be able to enhance the smoothness by providing a degree of "play” or looseness which enables the reduced overlaps to partially amalgamate or settle closely against (or partially “into") each other, thus relieving some of the overlap tension and unevenness.
- the conventional larger overlaps extending nearer to the central portions of the tape are apparently unable to do this.
- the preferred fibrous backing appears to produce a greater smoothing effect than is obtained by similarly reduced overlapping of polymer-backed mica tapes. The aforementioned breakage of brittle fibres is also reduced, presumably due to reduction in tension in the overlaps according to the present invention.
- the fibrous support of each tape is an open-weave cloth, preferably a square weave having the weft fibres or filaments substantially normal to the length of the tape.
- adjacent fibres in the weave are preferably spaced apart by a distance at least equal to the average fibre thickness, more preferably at least twice the average fibre thickness, and preferably not more than 20 times (more preferably not more than 10 times) the average fibre thickness.
- the preferred fibrous materials are woven glass cloths.
- the covering tape backing preferably comprises a substantially continuous film of organic polymeric material, for example polyethylene or polyester film. Tapes having polymer coatings or films applied over the aforementioned fibrous (cloth) backings may be advantageous in combining the preferable qualities of the fibre or cloth and the polymeric (film) backings.
- the overlapping portions of the covering (outer) tape are positioned substantially mid-way between the overlapping portions of the underlayer tape.
- the wire conductor 10 is shown carrying a first spiral wrap of glass-cloth-backed mica tape 20, the preferred open square weave of the glass cloth support of the tape being suggested by one illustrated strip 22.
- the tape is wrapped so that successive turns overlap by about 10% of the tape width (not to scale) and, as shown schematically, these overlaps 24 tend may to flatten slightly as indicated to provide a somewhat smoother wrapping. Larger overlaps may also be acceptable in this under-layer.
- a second covering wrap of a similar mica tape 30 is shown having its overlaps of about 2% of tape width positioned in the preferred arrangement mid-way between those of the underlying tape 20. These minimal overlaps tend to produce noticeably smoother wrapping, as aforesaid.
- two glass-cloth-backed mica tapes of 120 g/m 2 weight wrapped as shown in Figure 1 can advantageously achieve substantially the same level of fire protection with the coverage tending towards the theoretical minimum of only 240 g/m 2 (slightly more on average over the whole wire, due to the small overlaps).
- a splicing tape 40 occurs on the mica tapes, it appears to benefit to some extent from the "amalgamation" effect of the reduced overlaps according to the present invention, as indicated schematically at splice overlaps 42 and 44, thus reducing substantially the problematic splice-tape-thickness-doubling effect illustrated in Sketch G.
- a thin (0.35 mm) coating of polymeric insulation 50 can be extruded by methods known per se over the wrapped tapes 20 and 30 with only a relatively small and acceptable thickening 55 occurring at the splice.
- a thinner, smoother wire is thus produced according to this invention, with improved production efficiency, to meet the same fire-resistance standards which previously required much higher percentage overlaps of lighter tapes and/or thicker polymer coatings.
- Fire resistance may be measured on fire test samples consisting of 2 of mica-wrapped wires with no additional polymer insulation twisted together with an overall copper braid applied.
- the fire tests are performed according to IEC331 (published by International Electrotechnical Commission, 1 rue de Varembe, Geneva) with the flame enhanced to 950°C ⁇ 50°C. Voltage is applied to the conductors with the braid connected to earth. Tests are terminated if the cable maintains circuit integrity for more than 60 minutes.
- the present invention may be practised using any of the known materials and production methods suitable for the production of insulated electrical wires, especially fire-resistant electrical wires.
- a preferred example will now be described by way of further illustration of the invention.
Landscapes
- Insulated Conductors (AREA)
- Insulating Bodies (AREA)
Claims (14)
- Fil électrique ayant un conducteur portant au moins une sous-couche électriquement isolante en matière résistant au feu sur laquelle est enveloppé en hélice un ruban de recouvrement électriquement isolant en matière inorganique résistant au feu, des spires adjacentes du ruban se chevauchant entre elles de moins de 5%, avantageusement moins de 3%, de la largeur du ruban.
- Fil selon la revendication 1, dans lequel la sous-couche comprend un ruban de matière inorganique résistant au feu enroulé en hélice autour du conducteur et les régions de chevauchement du ruban de recouvrement sont positionnées entre les régions de chevauchement du ruban de sous-couche.
- Fil selon la revendication 2, dans lequel des spires adjacentes du ruban de sous-couche se chevauchent entre elles de moins de 20%, avantageusement moins de 15%, de la largeur du ruban de la sous-couche.
- Fil selon la revendication 2 ou 3, dans lequel les deux rubans ont sensiblement la même largeur et la même épaisseur.
- Fil selon l'une quelconque des revendications 2 à 4, dans lequel les spires adjacentes du ruban de recouvrement se chevauchent entre elles moins que les spires adjacentes du ruban de la sous-couche ne se chevauchent entre elles.
- Fil selon l'une quelconque des revendications 2 à 5, dans lequel les parties se chevauchant du ruban de recouvrement sont positionnées sensiblement à mi-distance entre les parties se chevauchant du ruban de la sous-couche.
- Fil selon l'une quelconque des revendications précédentes, dans lequel les spires adjacentes du ruban de recouvrement se chevauchent entre elles de moins de 2% de la largeur du ruban de recouvrement ou ont un chevauchement sensiblement nul.
- Fil selon l'une quelconque des revendications précédentes, ayant un revêtement de matière polymère organique d'une épaisseur inférieure à 0,8 millimètre, avantageusement inférieure à 0,6 mm, plus avantageusement inférieure à 0,5 mm et en particulier inférieure à 0,4 mm, s'étendant au-dessus de, et avantageusement en contact avec, la surface située le plus à l'extérieur du ruban de recouvrement.
- Fil selon l'une quelconque des revendications précédentes, dans lequel le ruban de recouvrement comprend un support fibreux, avantageusement formé d'une matière inorganique.
- Fil selon la revendication 9, dans lequel le support fibreux est une étoffe tissée à mailles ouvertes, avantageusement un tissu à mailles carrées dont les fibres ou les filaments de trame sont sensiblement normaux à la longueur du ruban.
- Fil selon la revendication 10, dans lequel des fibres adjacentes dans le tissu sont espacées d'une distance au moins égale à l'épaisseur moyenne des fibres, avantageusement au moins au double de l'épaisseur moyenne des fibres, et de préférence non supérieure à 20 fois (plus avantageusement non supérieure à 10 fois) l'épaisseur moyenne des fibres.
- Fil selon l'une quelconque des revendications précédentes, dans lequel le ruban de recouvrement comporte un dos en matière polymérique organique, de préférence un film sensiblement continu de matière polymérique organique.
- Fil selon la revendication 12, dans lequel ledit dos de matière organique a été appliqué sous forme d'un revêtement ou d'un film sur un support fibreux selon l'une quelconque des revendications 9 à 11.
- Fil selon l'une quelconque des revendications précédentes, dans lequel le ruban de recouvrement a un allongement à la rupture inférieur à 5%.
Applications Claiming Priority (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB9414245 | 1994-07-14 | ||
GB9414245A GB9414245D0 (en) | 1994-07-14 | 1994-07-14 | Fire resistant wires |
GBGB9500362.0A GB9500362D0 (en) | 1995-01-09 | 1995-01-09 | Fire-resistant wire |
GB9500362 | 1995-01-09 | ||
PCT/GB1995/001638 WO1996002920A1 (fr) | 1994-07-14 | 1995-07-12 | Fils ignifuges |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0770259A1 EP0770259A1 (fr) | 1997-05-02 |
EP0770259B1 true EP0770259B1 (fr) | 1999-09-15 |
Family
ID=26305270
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP95924456A Expired - Lifetime EP0770259B1 (fr) | 1994-07-14 | 1995-07-12 | Fils ignifuges |
Country Status (11)
Country | Link |
---|---|
EP (1) | EP0770259B1 (fr) |
JP (1) | JP4015694B2 (fr) |
KR (1) | KR100363600B1 (fr) |
CN (1) | CN1080443C (fr) |
AU (1) | AU696852B2 (fr) |
CA (1) | CA2194993C (fr) |
DE (1) | DE69512242T2 (fr) |
IL (1) | IL114579A (fr) |
MY (1) | MY113998A (fr) |
TW (1) | TW374182B (fr) |
WO (1) | WO1996002920A1 (fr) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2016193022A1 (fr) * | 2015-06-05 | 2016-12-08 | Leoni Kabel Holding Gmbh | Câble de donnees |
EP3301687A1 (fr) | 2016-09-29 | 2018-04-04 | Lapp Engineering & Co. | Câble et procédé pour produire un câble |
EP3886121A1 (fr) | 2020-03-25 | 2021-09-29 | Lapp Engineering & Co. | Câble résistant au feu |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN1044647C (zh) * | 1996-02-14 | 1999-08-11 | 陈云生 | 耐火合成云母带及其生产工艺 |
DE10203900A1 (de) * | 2002-01-31 | 2003-08-14 | Nexans | Elektrische Leitung |
PL1619694T3 (pl) * | 2004-07-23 | 2013-02-28 | Nexans | Izolowany przewód elektryczny z utrzymaniem funkcji w przypadku pożaru |
ES2359442T3 (es) * | 2007-08-31 | 2011-05-23 | Essex Europe Sas | Alambre eléctricamente conductor y método para su fabricación. |
DE102008000073A1 (de) * | 2008-01-17 | 2009-07-23 | Alstom Technology Ltd. | Leiterstab für eine rotierende elektrische Maschine |
EP3257056B1 (fr) | 2015-02-10 | 2022-04-06 | Prysmian S.p.A. | Câble résistant au feu |
AU2016389384B2 (en) | 2016-01-26 | 2021-03-04 | Prysmian S.P.A. | Fire resistive cable system |
US10998110B2 (en) * | 2019-01-18 | 2021-05-04 | Priority Wire & Cable, Inc. | Flame resistant covered conductor cable |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3631699C2 (de) * | 1986-09-18 | 1993-11-11 | Kabelmetal Electro Gmbh | Flammbeständige elektrische Leitung |
-
1995
- 1995-07-12 EP EP95924456A patent/EP0770259B1/fr not_active Expired - Lifetime
- 1995-07-12 KR KR1019970700213A patent/KR100363600B1/ko not_active IP Right Cessation
- 1995-07-12 WO PCT/GB1995/001638 patent/WO1996002920A1/fr active IP Right Grant
- 1995-07-12 AU AU28951/95A patent/AU696852B2/en not_active Expired
- 1995-07-12 JP JP50479296A patent/JP4015694B2/ja not_active Expired - Lifetime
- 1995-07-12 CA CA002194993A patent/CA2194993C/fr not_active Expired - Lifetime
- 1995-07-12 DE DE69512242T patent/DE69512242T2/de not_active Expired - Lifetime
- 1995-07-12 CN CN95194100A patent/CN1080443C/zh not_active Expired - Lifetime
- 1995-07-13 MY MYPI95001987A patent/MY113998A/en unknown
- 1995-07-13 IL IL11457995A patent/IL114579A/en not_active IP Right Cessation
- 1995-07-17 TW TW084107380A patent/TW374182B/zh not_active IP Right Cessation
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2016193022A1 (fr) * | 2015-06-05 | 2016-12-08 | Leoni Kabel Holding Gmbh | Câble de donnees |
US20180096753A1 (en) * | 2015-06-05 | 2018-04-05 | Leoni Kabel Gmbh | Data cable |
EP3301687A1 (fr) | 2016-09-29 | 2018-04-04 | Lapp Engineering & Co. | Câble et procédé pour produire un câble |
EP3886121A1 (fr) | 2020-03-25 | 2021-09-29 | Lapp Engineering & Co. | Câble résistant au feu |
Also Published As
Publication number | Publication date |
---|---|
DE69512242T2 (de) | 2000-07-20 |
KR100363600B1 (ko) | 2003-02-19 |
WO1996002920A1 (fr) | 1996-02-01 |
AU2895195A (en) | 1996-02-16 |
KR970705149A (ko) | 1997-09-06 |
EP0770259A1 (fr) | 1997-05-02 |
CN1152969A (zh) | 1997-06-25 |
CA2194993A1 (fr) | 1996-02-01 |
DE69512242D1 (de) | 1999-10-21 |
JPH10503050A (ja) | 1998-03-17 |
CN1080443C (zh) | 2002-03-06 |
AU696852B2 (en) | 1998-09-17 |
MY113998A (en) | 2002-07-31 |
IL114579A0 (en) | 1995-11-27 |
TW374182B (en) | 1999-11-11 |
IL114579A (en) | 1998-08-16 |
JP4015694B2 (ja) | 2007-11-28 |
CA2194993C (fr) | 2003-10-28 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
KR100709559B1 (ko) | 고성능 데이터 케이블 | |
EP0770259B1 (fr) | Fils ignifuges | |
US3649744A (en) | Service entrance cable with preformed fiberglass tape | |
US4081602A (en) | Self-supporting cable | |
US5043538A (en) | Water resistant cable construction | |
CN1029883C (zh) | 接合面覆盖有润滑剂的粘接铠装(光、电)缆 | |
US5502287A (en) | Multi-component cable assembly | |
KR100671184B1 (ko) | 고성능 데이터 케이블 및 ul 910 플리넘 비불소화자켓의 고성능 데이터 케이블 | |
US3602636A (en) | Wrapped service entrance cable | |
US4644098A (en) | Longitudinally wrapped cable | |
CA1055132A (fr) | Conducteur sous enveloppe etanche | |
AU2018424297B2 (en) | High voltage power cable with fatigue-resistant water barrier | |
US11049630B2 (en) | Multicore cable | |
CN1669095A (zh) | 一种带有屏蔽片的电缆 | |
JPS6246927B2 (fr) | ||
US4241121A (en) | Combined shield and core wrap for telecommunication cables and the like | |
GB2115172A (en) | Optical fibre cables | |
JP2020057589A (ja) | 耐火電線 | |
JP2000156124A (ja) | ツイストペア線およびそれを撚り合わせたペアケーブル | |
JP2984071B2 (ja) | 電子機器用ケーブル | |
HU180818B (en) | Method and apparatus for coating cable-like or rope-like industrial products with layer of wire and single- or multicore electrical cable produced thereof | |
CN210110386U (zh) | 防水防火电缆 | |
JPH06309948A (ja) | ゴム、プラスチック絶縁電力ケーブル | |
CA1133080A (fr) | Blindage et guipage combines pour cables de telecommunications | |
JPH0421967B2 (fr) |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
17P | Request for examination filed |
Effective date: 19961218 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): CH DE FR GB IT LI NL |
|
17Q | First examination report despatched |
Effective date: 19971007 |
|
GRAG | Despatch of communication of intention to grant |
Free format text: ORIGINAL CODE: EPIDOS AGRA |
|
GRAG | Despatch of communication of intention to grant |
Free format text: ORIGINAL CODE: EPIDOS AGRA |
|
GRAH | Despatch of communication of intention to grant a patent |
Free format text: ORIGINAL CODE: EPIDOS IGRA |
|
GRAH | Despatch of communication of intention to grant a patent |
Free format text: ORIGINAL CODE: EPIDOS IGRA |
|
GRAA | (expected) grant |
Free format text: ORIGINAL CODE: 0009210 |
|
AK | Designated contracting states |
Kind code of ref document: B1 Designated state(s): CH DE FR GB IT LI NL |
|
REG | Reference to a national code |
Ref country code: CH Ref legal event code: EP |
|
REG | Reference to a national code |
Ref country code: CH Ref legal event code: NV Representative=s name: KIRKER & CIE SA |
|
REF | Corresponds to: |
Ref document number: 69512242 Country of ref document: DE Date of ref document: 19991021 |
|
ET | Fr: translation filed | ||
ITF | It: translation for a ep patent filed |
Owner name: MODIANO & ASSOCIATI S.R.L. |
|
PLBE | No opposition filed within time limit |
Free format text: ORIGINAL CODE: 0009261 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT |
|
26N | No opposition filed | ||
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: NL Payment date: 20010730 Year of fee payment: 7 |
|
REG | Reference to a national code |
Ref country code: GB Ref legal event code: IF02 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: NL Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20030201 |
|
NLV4 | Nl: lapsed or anulled due to non-payment of the annual fee |
Effective date: 20030201 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: CH Payment date: 20140728 Year of fee payment: 20 Ref country code: DE Payment date: 20140729 Year of fee payment: 20 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: GB Payment date: 20140729 Year of fee payment: 20 Ref country code: FR Payment date: 20140717 Year of fee payment: 20 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: IT Payment date: 20140724 Year of fee payment: 20 |
|
REG | Reference to a national code |
Ref country code: DE Ref legal event code: R071 Ref document number: 69512242 Country of ref document: DE |
|
REG | Reference to a national code |
Ref country code: CH Ref legal event code: PL |
|
REG | Reference to a national code |
Ref country code: GB Ref legal event code: PE20 Expiry date: 20150711 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: GB Free format text: LAPSE BECAUSE OF EXPIRATION OF PROTECTION Effective date: 20150711 |