EP0805903B1 - Fire resistant covers for electrical fittings - Google Patents

Fire resistant covers for electrical fittings Download PDF

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Publication number
EP0805903B1
EP0805903B1 EP95936038A EP95936038A EP0805903B1 EP 0805903 B1 EP0805903 B1 EP 0805903B1 EP 95936038 A EP95936038 A EP 95936038A EP 95936038 A EP95936038 A EP 95936038A EP 0805903 B1 EP0805903 B1 EP 0805903B1
Authority
EP
European Patent Office
Prior art keywords
cover
fabric
recessed
intumescent
side wall
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
Application number
EP95936038A
Other languages
German (de)
French (fr)
Other versions
EP0805903A1 (en
Inventor
Derek Alfred Ward
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Environmental Seals Ltd
Original Assignee
Environmental Seals Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Environmental Seals Ltd filed Critical Environmental Seals Ltd
Publication of EP0805903A1 publication Critical patent/EP0805903A1/en
Application granted granted Critical
Publication of EP0805903B1 publication Critical patent/EP0805903B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V25/00—Safety devices structurally associated with lighting devices
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B9/00—Ceilings; Construction of ceilings, e.g. false ceilings; Ceiling construction with regard to insulation
    • E04B9/006—Ceilings; Construction of ceilings, e.g. false ceilings; Ceiling construction with regard to insulation with means for hanging lighting fixtures or other appliances to the framework of the ceiling
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S8/00—Lighting devices intended for fixed installation
    • F21S8/02—Lighting devices intended for fixed installation of recess-mounted type, e.g. downlighters
    • F21S8/026—Lighting devices intended for fixed installation of recess-mounted type, e.g. downlighters intended to be recessed in a ceiling or like overhead structure, e.g. suspended ceiling

Definitions

  • This invention relates to ventilated covers for electrical fittings and more especially but not exclusively to a ventilated cover for a recessed electrical fitting, such as a downlighter set in a plasterboard ceiling, which, in the event of a fire, isolates the fitting from the structure in which it is recessed to maintain the fire resistance thereof.
  • Light fittings recessed into ceilings are well known. Such light fittings are known as downlighters. The heat generated by such light fittings can be considerable and represents a fire hazard. Also the recess in which such a fitting is mounted can itself provide a path for fire and smoke to a room or area located above that ceiling.
  • GB-A-2270936 discloses a downlighter which comprises a hood of tented pyramidical shape formed from a fire resistant flexible net material and provided with a hole at or near to its apex to allow for the passage of a cable.
  • the hood is not ventilated and is produced from an air pervious material coated with a fire resistant intumescent material.
  • This hood construction suffers from a number of disadvantages, these including those imposed by its shape and lack of ventilation, and the fact that the hole through which cabling can pass permits the passage of smoke and flames in the event of a fire.
  • the present invention sets out to provide a ventilated cover for an electrical fitting which eliminates, or at least alleviates, many of the disadvantages present in existing fire resistant covers.
  • a fire resistant cover for an electrical fitting to be recessed into a supporting structure, the cover comprising a fabric hood coated or impregnated with a liquid based intumescent material and including an aperture through which a cable can pass, the cover being characterised in that it is shaped to include a top supported by one or more upstanding side walls, and comprises an intumescent gasket including a card which overlies a fibrous sheet impregnated with carbon granules secured to the top of the cover and including a plurality of ventilation apertures through one of which electrical wiring can pass to an electrical fitting protected by the cover, and means for connecting the cover to adjoining surfaces of the structure in which the electrical fitting is recessed.
  • the fabric is preferably a fibrous cloth (e.g. a glass fibre cloth) which is coated on one or each of its surfaces with liquid based intumescent material.
  • a fibrous cloth e.g. a glass fibre cloth
  • the cover illustrated in Figures 1 and 2 is produced from a fibrous woven cloth (e.g. a glass fibre woven cloth) which has been coated on one or both of its sides with an intumescent paint or other intumescent medium.
  • the cloth is impregnated with intumescent medium.
  • the cover is generally circular in cross-section and comprises an upstanding side wall 1, a top 2 and floor pieces 3 which extend inwardly from the lower margin of the side wall. Wires 4 are sewn into the fabric of the side walls 1 to assist in holding the cover upright.
  • the side wall 1 is produced from a length of glass fibre cloth which is sewn together at the strip ends, the top 2 then being secured to the upper margin of the side wall again by sewing.
  • the floor pieces 3 are simply sewn to the lower margin of the side wall and are cut to enable the pieces 3 to lie flat on the adjoining surface of the suspended ceiling.
  • the outside diameter of the cover is 289mm and the height of the cover is typically 145mm.
  • the top of the cover has secured to it a circular piece of card 5 which overlies and is bonded to a similarly shaped piece of intumescent material to define an intumescent gasket.
  • This material typically comprises a fibrous sheet impregnated with an intumescent material such as carbon granules.
  • the gasket comprising the card and intumescent piece may simply be secured to the top of the cover by studs 6 or rivets.
  • the gasket is formed with a central opening through which can pass electrical cabling for the light fitting and four ventilation apertures 8. Similar openings are formed in the top of the cover. Typically the outside diameter of the gasket is 60mm.
  • the opening through which the cover must pass is relatively small. Because of the flexibility of the fabric material from which the cover and the gasket is formed, the hood can simply be squashed or folded to form a narrow tube which can readily pass through even the smallest ceiling opening for location about the margin of the ceiling opening. Before doing so, the electric wire which carries current to the electrical fitting is passed through the central opening formed in the top 2 of the cover. Once sited, the floor pieces 3 of the cover are secured to the upper surface of the ceiling plasterboard using fixing pins 9 such as illustrated in Figure 3. Other simple forms of fixings may be employed. The fixing pins 9 have the advantage that they can be secured in place using finger pressure. Downlighting can then simply be connected to a source of electricity via the appropriate wire and the opening formed in the plasterboard ceiling closed with a lens cover in the normal way.
  • the heat generated by downlighters recessed into ceilings can represent fire hazards.
  • the intumescent content of the cover and the card layer 5 quickly expands to isolate the fitting entirely from the surrounding structure thereby confining the fire and maintaining the fire resistance of the structure.
  • Covers in accordance with the invention have been subjected to fire testing with no failure of the integrity criterion at the end of four hours testing. Insulation failure occurred after 46 minutes.
  • the cover illustrated in Figures 4 and 5 differs from that described above by the presence of fixing straps 10 secured to the lower inner surface of the cover which can be deformed as shown in Figure 5 to locate around a sheet of plasterboard 11 (left hand construction of Figure 5) or around and between superimposed sheets of plasterboard 12 (right hand construction of Figure 5).
  • the floor pieces 3 are folded away from the cover interior and lie in contact with the upper surface of the ceiling plasterboard on which the cover is positioned.

Landscapes

  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Insulating Bodies (AREA)
  • Building Environments (AREA)
  • Casings For Electric Apparatus (AREA)
  • Insulation, Fastening Of Motor, Generator Windings (AREA)
  • Organic Insulating Materials (AREA)

Abstract

A fire resistant cover for an electrical fitting to be recessed into a supporting structure comprises a fabric hood coated or impregnated with a liquid based intumescent material and includes a top supported by one or more upstanding side walls and a plurality of fabric pieces which extend inwardly from the lower margin of the or each side wall. The top of the cover includes a layer of intumescent material which is formed with a plurality of apertures through one of which electrical wiring to the fitting can pass. Complementary apertures are formed in the top of the cover, and means are provided for connecting the inwardly extending material pieces to adjoining surfaces of the structure in which the electrical fitting is recessed.

Description

  • This invention relates to ventilated covers for electrical fittings and more especially but not exclusively to a ventilated cover for a recessed electrical fitting, such as a downlighter set in a plasterboard ceiling, which, in the event of a fire, isolates the fitting from the structure in which it is recessed to maintain the fire resistance thereof.
  • Light fittings recessed into ceilings are well known. Such light fittings are known as downlighters. The heat generated by such light fittings can be considerable and represents a fire hazard. Also the recess in which such a fitting is mounted can itself provide a path for fire and smoke to a room or area located above that ceiling.
  • For cosmetic reasons, the aperture which is cut into a plasterboard ceiling to receive a downlighter is kept to a minimum. This restricts the size of ventilated cover which can be employed, particularly where an existing downlighter is to be fire-proofed. Fire resistant covers for downlighters have previously been proposed but are generally too large to pass through a downlighter recess formed in an existing ceiling. Also, where this is possible, the covers rely upon fixings into the exposed surface of the plasterboard ceiling for securement purposes. This is aesthetically unappealing.
  • GB-A-2270936 discloses a downlighter which comprises a hood of tented pyramidical shape formed from a fire resistant flexible net material and provided with a hole at or near to its apex to allow for the passage of a cable. The hood is not ventilated and is produced from an air pervious material coated with a fire resistant intumescent material. This hood construction suffers from a number of disadvantages, these including those imposed by its shape and lack of ventilation, and the fact that the hole through which cabling can pass permits the passage of smoke and flames in the event of a fire.
  • The present invention sets out to provide a ventilated cover for an electrical fitting which eliminates, or at least alleviates, many of the disadvantages present in existing fire resistant covers.
  • According to the present invention in one aspect, there is provided a fire resistant cover for an electrical fitting to be recessed into a supporting structure, the cover comprising a fabric hood coated or impregnated with a liquid based intumescent material and including an aperture through which a cable can pass, the cover being characterised in that it is shaped to include a top supported by one or more upstanding side walls, and comprises an intumescent gasket including a card which overlies a fibrous sheet impregnated with carbon granules secured to the top of the cover and including a plurality of ventilation apertures through one of which electrical wiring can pass to an electrical fitting protected by the cover, and means for connecting the cover to adjoining surfaces of the structure in which the electrical fitting is recessed.
  • The fabric is preferably a fibrous cloth (e.g. a glass fibre cloth) which is coated on one or each of its surfaces with liquid based intumescent material.
  • The invention will now be described by way of example only with reference to the accompanying diagrammatic drawings in which:-
  • Figure 1 is a perspective view of a cover in accordance with the invention;
  • Figure 2 is a plan view from above of the cover shown in Figure 1;
  • Figure 3 schematically illustrates a fixing for securing the cover to an adjoining ceiling structure; and
  • Figures 4 and 5 are perspective and sectional views of an alternative cover in accordance with the invention.
  • The cover illustrated in Figures 1 and 2 is produced from a fibrous woven cloth (e.g. a glass fibre woven cloth) which has been coated on one or both of its sides with an intumescent paint or other intumescent medium. Preferably the cloth is impregnated with intumescent medium. The cover is generally circular in cross-section and comprises an upstanding side wall 1, a top 2 and floor pieces 3 which extend inwardly from the lower margin of the side wall. Wires 4 are sewn into the fabric of the side walls 1 to assist in holding the cover upright.
  • Typically the side wall 1 is produced from a length of glass fibre cloth which is sewn together at the strip ends, the top 2 then being secured to the upper margin of the side wall again by sewing. The floor pieces 3 are simply sewn to the lower margin of the side wall and are cut to enable the pieces 3 to lie flat on the adjoining surface of the suspended ceiling.
  • Typically the outside diameter of the cover is 289mm and the height of the cover is typically 145mm.
  • The top of the cover has secured to it a circular piece of card 5 which overlies and is bonded to a similarly shaped piece of intumescent material to define an intumescent gasket. This material typically comprises a fibrous sheet impregnated with an intumescent material such as carbon granules. The gasket comprising the card and intumescent piece may simply be secured to the top of the cover by studs 6 or rivets. The gasket is formed with a central opening through which can pass electrical cabling for the light fitting and four ventilation apertures 8. Similar openings are formed in the top of the cover. Typically the outside diameter of the gasket is 60mm.
  • As will be appreciated, the opening through which the cover must pass is relatively small. Because of the flexibility of the fabric material from which the cover and the gasket is formed, the hood can simply be squashed or folded to form a narrow tube which can readily pass through even the smallest ceiling opening for location about the margin of the ceiling opening. Before doing so, the electric wire which carries current to the electrical fitting is passed through the central opening formed in the top 2 of the cover. Once sited, the floor pieces 3 of the cover are secured to the upper surface of the ceiling plasterboard using fixing pins 9 such as illustrated in Figure 3. Other simple forms of fixings may be employed. The fixing pins 9 have the advantage that they can be secured in place using finger pressure. Downlighting can then simply be connected to a source of electricity via the appropriate wire and the opening formed in the plasterboard ceiling closed with a lens cover in the normal way.
  • In use, the heat generated by downlighters recessed into ceilings can represent fire hazards. In the event of such a fire, the intumescent content of the cover and the card layer 5 quickly expands to isolate the fitting entirely from the surrounding structure thereby confining the fire and maintaining the fire resistance of the structure. Covers in accordance with the invention have been subjected to fire testing with no failure of the integrity criterion at the end of four hours testing. Insulation failure occurred after 46 minutes.
  • The cover illustrated in Figures 4 and 5 differs from that described above by the presence of fixing straps 10 secured to the lower inner surface of the cover which can be deformed as shown in Figure 5 to locate around a sheet of plasterboard 11 (left hand construction of Figure 5) or around and between superimposed sheets of plasterboard 12 (right hand construction of Figure 5). In this embodiment, the floor pieces 3 are folded away from the cover interior and lie in contact with the upper surface of the ceiling plasterboard on which the cover is positioned.
  • It will be appreciated that the foregoing is merely exemplary of fire resistant covers in accordance with the invention and that modifications can readily by made thereto without departing from the true scope of the invention as set out in the appended claims.

Claims (7)

  1. A fire resistant cover for an electrical fitting to be recessed into a supporting structure, the cover comprising a fabric hood coated or impregnated with a liquid based intumescent material and including an aperture through which a cable can pass and means (9,10) for connecting the cover to adjoining surfaces of the structure in which the electrical fitting is recessed, the cover (1) being characterised in that it is shaped to include a top (2) supported by one or more upstanding side walls (4), an intumescent gasket (5) comprising a card which overlies a fibrous sheet impregnated with carbon granules secured to the top of the cover and including a plurality of ventilation apertures (8) through one of which electrical wiring can pass to an electrical fitting protected by the cover.
  2. A cover as claimed in claim 1 further comprising a plurality of fabric pieces (3) secured to the lower margin(s) of the side wall(s) of the cover.
  3. A cover as claimed in claim 2 wherein the fabric pieces (3) extend inwardly from the lower margin(s) of the side wall(s), the connecting means (9,10) cooperating with the fabric pieces to secure the cover to the adjoining surfaces of the structure.
  4. A cover as claimed in claim 1 or claim 2 wherein the connecting means comprises at least one fixing strap (10) secured to the interior of the side wall(s) of the hood and deformable around an edge of the supporting structure to connect the hood to the supporting structure.
  5. A cover as claimed in any one of claims 1 to 4 wherein the top (2) of the cover (1) extends below the intumescent gasket (5) and includes apertures complementary to those of the intumescent gasket.
  6. A cover as claimed in any one of claims 1 to 5 wherein the fabric is a fibrous cloth.
  7. A cover as claimed in claim 6 wherein the fabric is a glass fibre cloth coated on one or each of its surfaces with liquid based intumescent material.
EP95936038A 1995-01-25 1995-11-06 Fire resistant covers for electrical fittings Expired - Lifetime EP0805903B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
GBGB9501391.8A GB9501391D0 (en) 1995-01-25 1995-01-25 Ventilated covers for electrical fittings
GB9501391 1995-01-25
PCT/GB1995/002598 WO1996023113A1 (en) 1995-01-25 1995-11-06 Fire resistant covers for electrical fittings

Publications (2)

Publication Number Publication Date
EP0805903A1 EP0805903A1 (en) 1997-11-12
EP0805903B1 true EP0805903B1 (en) 1999-04-07

Family

ID=10768500

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95936038A Expired - Lifetime EP0805903B1 (en) 1995-01-25 1995-11-06 Fire resistant covers for electrical fittings

Country Status (10)

Country Link
EP (1) EP0805903B1 (en)
AT (1) ATE178678T1 (en)
AU (1) AU3812495A (en)
DE (1) DE69508968T2 (en)
DK (1) DK0805903T3 (en)
ES (1) ES2132730T3 (en)
GB (2) GB9501391D0 (en)
GR (1) GR3030647T3 (en)
WO (1) WO1996023113A1 (en)
ZA (1) ZA959774B (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003056233A1 (en) * 2001-12-21 2003-07-10 Environmental Seals Ltd Covers for electrical fittings
DE10216373A1 (en) * 2002-04-12 2003-10-30 Gessler Accumulatorentechnik G Fireproof safety lamp installation for use in tunnel, has metal housing surrounding gas- or vapor-discharge lamp and starter circuit and lined with panels of gypsum and fireproof fibrous material

Families Citing this family (34)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998012472A1 (en) * 1996-09-20 1998-03-26 Peter Charles Jones Installation of lighting or other fittings in ceilings
GB2326467A (en) 1997-05-29 1998-12-23 Environmental Seals Ltd Downlighter with integral fire-resistant hood
GB9710921D0 (en) * 1997-05-29 1997-07-23 Euro Passive Fire Protection L Ventilated covers for electrical fittings
AU7538598A (en) 1997-07-08 1999-02-08 Euro Passive Fire Protection Limited Ventilated covers for electrical fittings
EP0909919A3 (en) * 1997-10-14 2000-03-22 Carboline Europe Limited Downlighter cover
GB2345125B (en) * 1998-12-23 2002-05-01 Tenmat Ltd Intumescent downlighter cover and method of manufacturing same
GB2348603B (en) * 1999-03-23 2002-02-13 Uri Friedlander Fire barrier for electrical fittings
GB0130519D0 (en) 2001-12-21 2002-02-06 Environmental Seals Ltd Covers for electrical fittings
WO2003095892A1 (en) * 2002-05-11 2003-11-20 Michael Man-Cheung Tsang Fitting protector
DE10223904A1 (en) * 2002-05-29 2003-12-11 Kaiser Gmbh & Co Kg Suspended ceiling for fire protection purposes
GB2391023B (en) * 2002-07-20 2005-06-29 Laurence Keith Kovacs An intumescent assembly
AU2002950939A0 (en) * 2002-08-22 2002-09-12 Ian Thomas Craig Downlight protector housing
AU2005201631B2 (en) * 2004-04-20 2006-07-06 Wolfgang Trumpelmann Down light cover to guard against dust, insulation and combustible material
CN100529526C (en) * 2004-06-09 2009-08-19 武良举 Inserted fire-proof lamp
EP1754935B1 (en) * 2004-06-09 2009-09-30 Liangju Wu A built-in light fitting for fire preventing
GB0413655D0 (en) * 2004-06-18 2004-07-21 Scolmore Int Ltd Heat resistant casing
CN100483023C (en) * 2004-08-20 2009-04-29 武良举 Embedded lamp
GB2418784A (en) * 2004-10-01 2006-04-05 Environmental Seals Ltd A fire resistant cover for an electrical conduit or socket.
GB2421070B (en) * 2005-01-27 2007-01-10 Rd Europe Ltd Fire-resistant cover for lighting fitting
GB2422191B (en) 2005-01-27 2007-01-10 Rd Europe Ltd Fire-resistant lighting fitting
US8127800B2 (en) 2005-02-28 2012-03-06 Parker-Hannifin Corporation Fire protective hose assembly
CN1676178B (en) * 2005-04-13 2010-04-28 韦洪贞 Fire-proof mask and special expansion material of its radiating fin
GB2426300B (en) * 2005-05-18 2010-03-10 Environmental Seals Ltd Improvements in and relating to intumescent gaskets
GB0510494D0 (en) 2005-05-23 2005-06-29 Aurora Ltd Improvements to fire related downlights
GB2429052B (en) * 2005-08-08 2010-09-22 Laurence Kovacs Lighting assemblies
GB0523777D0 (en) 2005-11-23 2006-01-04 Environmental Seals Ltd Improved fixing mechanism for covers for electrical light fittings
FR2895489B1 (en) * 2005-12-27 2008-05-30 Jerome Martin SAFETY DEVICE FOR CEILINGS AND FALSE CEILINGS
GB2436673B (en) * 2006-03-27 2008-11-19 Magenta Group Internat Corp Fitting protector
GB2463533A (en) 2008-09-22 2010-03-24 Intumescent Systems Ltd Fire resistant cover for downlight.
GB0900420D0 (en) * 2009-01-12 2009-02-11 Scolmore Int Ltd Heat resistant casing
US8713944B2 (en) 2010-09-23 2014-05-06 Delavan Inc. High temperature manifolds for gas turbine engines
GB2551335A (en) * 2016-06-13 2017-12-20 Levco Ltd Improvements in or relating to organic material
GB2582544B (en) * 2019-03-14 2022-03-30 Hoody Speaker Hoods Ltd Covers for electrical appliances
CN114761647A (en) * 2019-09-16 2022-07-15 豪倍公司 Fire-proof sleeveless embedded lamp

Family Cites Families (3)

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Publication number Priority date Publication date Assignee Title
US4210070A (en) * 1978-03-06 1980-07-01 Dayus Barry R Ceiling fixture with thermal protection
GB2235710B (en) * 1989-09-05 1993-11-03 Environmental Seals Ltd Improvements in and relating to fire barriers
GB9220478D0 (en) * 1992-09-29 1992-11-11 Hamilton Arthur P Fire stop covering device for aperture in fire resistant structure

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003056233A1 (en) * 2001-12-21 2003-07-10 Environmental Seals Ltd Covers for electrical fittings
DE10216373A1 (en) * 2002-04-12 2003-10-30 Gessler Accumulatorentechnik G Fireproof safety lamp installation for use in tunnel, has metal housing surrounding gas- or vapor-discharge lamp and starter circuit and lined with panels of gypsum and fireproof fibrous material

Also Published As

Publication number Publication date
ZA959774B (en) 1996-05-29
DE69508968D1 (en) 1999-05-12
ATE178678T1 (en) 1999-04-15
GB9526310D0 (en) 1996-02-21
EP0805903A1 (en) 1997-11-12
WO1996023113A1 (en) 1996-08-01
DE69508968T2 (en) 1999-12-09
GR3030647T3 (en) 1999-10-29
GB2297609B (en) 1998-02-18
DK0805903T3 (en) 1999-10-25
ES2132730T3 (en) 1999-08-16
GB2297609A (en) 1996-08-07
GB9501391D0 (en) 1995-03-15
AU3812495A (en) 1996-08-14

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