WO2008093056A1 - Boîte mystique ignifuge - Google Patents

Boîte mystique ignifuge Download PDF

Info

Publication number
WO2008093056A1
WO2008093056A1 PCT/GB2008/000270 GB2008000270W WO2008093056A1 WO 2008093056 A1 WO2008093056 A1 WO 2008093056A1 GB 2008000270 W GB2008000270 W GB 2008000270W WO 2008093056 A1 WO2008093056 A1 WO 2008093056A1
Authority
WO
WIPO (PCT)
Prior art keywords
box
fire resistant
box according
intumescent material
clamping
Prior art date
Application number
PCT/GB2008/000270
Other languages
English (en)
Inventor
Karl Justin Rawlins
Barry Boothman
Original Assignee
Scolmore International Limited
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 Scolmore International Limited filed Critical Scolmore International Limited
Publication of WO2008093056A1 publication Critical patent/WO2008093056A1/fr

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
    • H02G3/00—Installations of electric cables or lines or protective tubing therefor in or on buildings, equivalent structures or vehicles
    • H02G3/02—Details
    • H02G3/08—Distribution boxes; Connection or junction boxes
    • H02G3/088—Dustproof, splashproof, drip-proof, waterproof, or flameproof casings or inlets
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
    • H02G3/00—Installations of electric cables or lines or protective tubing therefor in or on buildings, equivalent structures or vehicles
    • H02G3/02—Details
    • H02G3/08—Distribution boxes; Connection or junction boxes
    • H02G3/12—Distribution boxes; Connection or junction boxes for flush mounting
    • H02G3/123—Distribution boxes; Connection or junction boxes for flush mounting in thin walls

Definitions

  • This invention relates to a novel fire resistant back box for use with electrical fittings, particularly sockets and switches.
  • An object of the present invention is to provide a novel fire resistant back box which can be used with a wide range of electrical fittings in a wide range of installations and which in use is efficient at minimising the risk of fire spread, should that occur.
  • a fire resistant box suitable for fitting into a cavity and adapted to receive an electrical fitting comprises a substantially rigid box open at its front face for receiving an electrical fitting, said box having a flange extending around the periphery of the edge defining said front face, said box further being provided with at least one means for clamping the box in position within a cavity and said box having on its internal back surface a layer of solid intumescent material.
  • a fire resistant box suitable for fitting into a cavity and adapted to receive an electrical fitting comprises a substantially rigid box open at its front face for receiving an electrical fitting, said box having a flange extending around the periphery of the edge defining said front face, said box further being provided with at least one means for clamping the box in position within a cavity and said box having on its internal back surface a layer of solid intumescent material arranged such that in the event of a fire and/or excessive heat said layer of solid intumescent material will expand to substantially seal off any openings in the box. Examples of these openings are where cables pass through the back or side wall(s) of the box. Preferably in the event of a fire and/or excessive heat, the solid intumescent material will also fill the interior of the box.
  • the construction inhibits the spread of fire because the solid intumescent material expands under excessive heat to substantially seal off any openings in the box and probably also to fill the interior of the box.
  • the box is relatively easy to clamp into place.
  • the clamping means comprises one or more spring-loaded lugs provided with teeth and being slidably mounted within slots at each side of the box.
  • the box can be positioned in a cavity and then the lugs released so that the spring forces the teeth against the back face of the board or other laminar member surrounding the cavity.
  • two clamping means are provided, one in each side of two opposite side faces of the box.
  • the solid intumescent material comprises a woven or non-woven fibrous pad, e.g. of short-clipped fibres.
  • the intumescent material may be based on graphite or other intumesecent materials which upon exposure to extreme heat expand in volume but remain substantially coherent i.e. have char stability.
  • the intumescent material comprises graphite stabilised with mineral fibre.
  • An example of a graphite based material is that supplied by Technical Fibre Products Limited as 'Intumescent Material' and consists of a high temperature Rockwool® fibre mat containing easily dispersed foliating graphite bonded in acrylic.
  • a specific example is TFP 64854 having a pad thickness of 2.3mm and an expansion ratio bf about 18:1 available from Technical Fibre Products Limited.
  • expansion ratio we mean the expansion resulting upon exposure of the material to excessive heat, which in the case of an 18:1 would be 18 times the original volume.
  • the box preferably has a substantially rectangular (e.g. square) cross-section with four side walls and a back. Weakened 'knock outs' can be provided to allow passage of cables in and out of the box.
  • the box preferably conforms to British Standard BS4662:1970 - 'Specification for boxes for the enclosure of electrical accessories'. This sets out standard sizes for such back boxes so that it is possible to fit products from a number of manufacturers without changing the back box.
  • the box is may be in the following sizes: 132mm x 72mm x 37mm (shown in Figure 1 to 5), 132mm x 72mm x 45mm, 72mm x 72mm x 37mm or 72mm x 72mm x 45mm.
  • the size of the box is a matter of convenience for the user and the invention is not limited to just these sizes.
  • Figure 1 shows a perspective front view from one side of a box
  • Figure 2 shows a front view of the box
  • Figure 3 shows a side view of a the box
  • Figure 4 shows a perspective front view from the opposite side of the box as shown in Figure 1.
  • Figure 5 shows an end view of the box in Figures 1 to 4 with the fibrous sheet of intumescent material in place.
  • a rectangular metal box 1, open at the front, is provided with two clamping assemblies 2(a) and 2(b) on two of its opposing sides.
  • Each clamping means consists of a spring-loaded lug 6(a), 6(b) slidably mounted in 'T' shaped slots 3(a), 3(b) and each lug having a set of two teeth 4(a),4(b) - one tooth each side of each lug.
  • the spring loading is achieved by means of coil springs 10(a), 10(b).
  • the teeth are slidably mounted within slots 5(a), 5(b).
  • Box 1 has weakened areas 7, 8, 9, any of which may be knocked out to provide passage for cables.
  • a flange 11 extends around substantially the entire periphery of the front edge of the box.
  • a solid sheet of fire resistant intumescent material 13 is fitted against the internal surface of the back (12) of the box; this is not shown in Figures 1 to 4 for reasons of clarity but is hown in Figure 5.
  • lugs 6a, 6b are pushed against the force of the respective springs 10a, 10b and locked in place by locating lugs 6a, 6b against the surfaces at the neck of each T slot 3a,3b. This action retracts the four teeth 4a, 4b and to allow the box to be located within a cavity.
  • the intumescent pad 13 which is located against the internal back surface of the box, expands and fills the box cavity with a fire retardant compound.
  • This intumescent compound also seals all the apertures that may be in the back box, for example where the cable entries are, thus preventing the spread of fire from one side of the dividing wall/partition to the other.

Landscapes

  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Installation Of Indoor Wiring (AREA)

Abstract

La présente invention concerne une boîte ignifuge (1) convenant pour être montée à l'intérieur d'une cavité et adaptée pour recevoir un accessoire électrique qui comprend une boite (1) sensiblement rigide ouverte sur sa face avant destinée à recevoir un accessoire électrique, ladite boîte (1) présentant un rebord (11) s'étendant autour de la périphérie du bord définissant ladite face avant, ladite boîte étant pourvue en outre d'au moins un moyen (2a, 2b) destiné à serrer la boîte (1) en position à l'intérieur d'une cavité (par exemple dans une paroi interne) et ladite boîte (1) présentant sur sa surface arrière interne (12) une couche de matériau intumescent solide.
PCT/GB2008/000270 2007-01-30 2008-01-28 Boîte mystique ignifuge WO2008093056A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0701659.5 2007-01-30
GB0701659A GB0701659D0 (en) 2007-01-30 2007-01-30 Fire resistant metal back box

Publications (1)

Publication Number Publication Date
WO2008093056A1 true WO2008093056A1 (fr) 2008-08-07

Family

ID=37872954

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB2008/000270 WO2008093056A1 (fr) 2007-01-30 2008-01-28 Boîte mystique ignifuge

Country Status (2)

Country Link
GB (2) GB0701659D0 (fr)
WO (1) WO2008093056A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2206950A1 (fr) * 2009-01-12 2010-07-14 Scolmore International Limited Boîtier résistant à la chaleur

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2469515A (en) * 2009-04-17 2010-10-20 Demetri Kiloni Electrical back box with flange
US8648256B1 (en) * 2010-06-07 2014-02-11 Intumescent Technologies, Llc Intumescent swell devices
CN103353053B (zh) * 2013-06-28 2016-08-24 深圳市英威腾电气股份有限公司 一种兼容多型号安装口的键盘支架

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB742090A (en) * 1953-07-07 1955-12-21 Hartley Electromotives Ltd Mounting means for electrical switches, sockets and like electrical components in hollow walls
EP0476945A1 (fr) * 1990-09-15 1992-03-25 Environmental Seals Limited Etanchements coupe-feu
GB2257847A (en) * 1991-06-20 1993-01-20 Mk Electric Ltd Lid for electrical outlet boxes.
EP0854900A1 (fr) * 1995-10-13 1998-07-29 Minnesota Mining And Manufacturing Company Feutre coupe-feu
GB2325728A (en) * 1997-05-29 1998-12-02 Euro Passive Fire Protection L Fire-resistant, ventilated covers for electrical fittings

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3718379A1 (de) * 1987-06-02 1988-12-22 Raimund Andris Hohlwanddose fuer elektrische installationseinrichtungen, insbesondere fuer schalter, steckdosen od. dgl.
GB2329638B (en) * 1997-09-24 2001-06-13 Tenmat Ltd Improvements in and relating to intumescent products
US5931432A (en) * 1998-04-16 1999-08-03 Pelco Recessed-mounted housing
GB0117996D0 (en) * 2001-07-24 2001-09-19 Ackermann Ltd Floor boxes
US7812253B2 (en) * 2004-11-15 2010-10-12 E.Z. Barrier, Inc. Fire resistant barrier
GB2426300B (en) * 2005-05-18 2010-03-10 Environmental Seals Ltd Improvements in and relating to intumescent gaskets

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB742090A (en) * 1953-07-07 1955-12-21 Hartley Electromotives Ltd Mounting means for electrical switches, sockets and like electrical components in hollow walls
EP0476945A1 (fr) * 1990-09-15 1992-03-25 Environmental Seals Limited Etanchements coupe-feu
GB2257847A (en) * 1991-06-20 1993-01-20 Mk Electric Ltd Lid for electrical outlet boxes.
EP0854900A1 (fr) * 1995-10-13 1998-07-29 Minnesota Mining And Manufacturing Company Feutre coupe-feu
GB2325728A (en) * 1997-05-29 1998-12-02 Euro Passive Fire Protection L Fire-resistant, ventilated covers for electrical fittings

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2206950A1 (fr) * 2009-01-12 2010-07-14 Scolmore International Limited Boîtier résistant à la chaleur
GB2466875B (en) * 2009-01-12 2013-02-20 Scolmore Int Ltd Heat resistant casing

Also Published As

Publication number Publication date
GB2446271A (en) 2008-08-06
GB0801477D0 (en) 2008-03-05
GB0701659D0 (en) 2007-03-07

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