GB2418784A - A fire resistant cover for an electrical conduit or socket. - Google Patents
A fire resistant cover for an electrical conduit or socket. Download PDFInfo
- Publication number
- GB2418784A GB2418784A GB0421839A GB0421839A GB2418784A GB 2418784 A GB2418784 A GB 2418784A GB 0421839 A GB0421839 A GB 0421839A GB 0421839 A GB0421839 A GB 0421839A GB 2418784 A GB2418784 A GB 2418784A
- Authority
- GB
- United Kingdom
- Prior art keywords
- cover
- fire
- foam
- sponge
- coating
- 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.)
- Withdrawn
Links
- 230000009970 fire resistant effect Effects 0.000 title 1
- 239000003063 flame retardant Substances 0.000 claims abstract description 27
- 239000000463 material Substances 0.000 claims abstract description 14
- 239000000853 adhesive Substances 0.000 claims abstract description 7
- 230000001070 adhesive effect Effects 0.000 claims abstract description 7
- 238000000576 coating method Methods 0.000 claims description 18
- 239000011248 coating agent Substances 0.000 claims description 14
- 239000000243 solution Substances 0.000 claims description 12
- 239000006260 foam Substances 0.000 claims description 11
- 239000004114 Ammonium polyphosphate Substances 0.000 claims description 7
- 235000019826 ammonium polyphosphate Nutrition 0.000 claims description 7
- 229920001276 ammonium polyphosphate Polymers 0.000 claims description 7
- VTYYLEPIZMXCLO-UHFFFAOYSA-L calcium carbonate Substances [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 6
- 230000001413 cellular effect Effects 0.000 claims description 6
- 229920002635 polyurethane Polymers 0.000 claims description 5
- 239000004814 polyurethane Substances 0.000 claims description 5
- 239000000565 sealant Substances 0.000 claims description 5
- 239000007864 aqueous solution Substances 0.000 claims description 4
- 239000011148 porous material Substances 0.000 claims description 4
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims description 3
- 229920006243 acrylic copolymer Polymers 0.000 claims description 3
- 235000010216 calcium carbonate Nutrition 0.000 claims description 3
- 229910052749 magnesium Inorganic materials 0.000 claims description 3
- 239000001095 magnesium carbonate Substances 0.000 claims description 3
- 235000011160 magnesium carbonates Nutrition 0.000 claims description 3
- BIKXLKXABVUSMH-UHFFFAOYSA-N trizinc;diborate Chemical compound [Zn+2].[Zn+2].[Zn+2].[O-]B([O-])[O-].[O-]B([O-])[O-] BIKXLKXABVUSMH-UHFFFAOYSA-N 0.000 claims description 3
- 229920006163 vinyl copolymer Polymers 0.000 claims description 3
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 claims description 3
- BLRPTPMANUNPDV-UHFFFAOYSA-N Silane Chemical compound [SiH4] BLRPTPMANUNPDV-UHFFFAOYSA-N 0.000 claims description 2
- 229920001296 polysiloxane Polymers 0.000 claims description 2
- 229910000077 silane Inorganic materials 0.000 claims description 2
- 230000009969 flowable effect Effects 0.000 claims 2
- 229920005830 Polyurethane Foam Polymers 0.000 abstract description 4
- 239000011496 polyurethane foam Substances 0.000 abstract description 4
- 239000002987 primer (paints) Substances 0.000 description 13
- 239000000779 smoke Substances 0.000 description 3
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 2
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 1
- 230000001680 brushing effect Effects 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 239000000839 emulsion Substances 0.000 description 1
- 238000004079 fireproofing Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62C—FIRE-FIGHTING
- A62C3/00—Fire prevention, containment or extinguishing specially adapted for particular objects or places
- A62C3/16—Fire prevention, containment or extinguishing specially adapted for particular objects or places in electrical installations, e.g. cableways
-
- 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
- H02G3/04—Protective tubing or conduits, e.g. cable ladders or cable troughs
-
- 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
- H02G3/04—Protective tubing or conduits, e.g. cable ladders or cable troughs
- H02G3/0406—Details thereof
- H02G3/0412—Heat or fire protective means
Landscapes
- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Business, Economics & Management (AREA)
- Public Health (AREA)
- Health & Medical Sciences (AREA)
- Emergency Management (AREA)
- Building Environments (AREA)
- Laminated Bodies (AREA)
- Lining Or Joining Of Plastics Or The Like (AREA)
- Fireproofing Substances (AREA)
- Paints Or Removers (AREA)
Abstract
A cover is made up of a number of walls 1 and a base (2, fig 1) of fire retardant polyurethane foam material which may be glued together with an intumescent adhesive. The cover shaped show that it forms a close fit around whichever conduit it is made for. A number of fixings in the forms of metallic strips 3 with holes 4 allow the conduit and cover assembly to be attached to a surface, using fixing means though the holes 4. This means that a device like a socket will be able to be fixed in position in the cavity of a stud wall.
Description
24 1 8784
FIREPROOFED COVERS FOR CONDUIT FITTINGS
This invention relates to fireproofed covers for conduit fittings for receiving electrical cabling.
Electrical services which pass through fire walls or ceilings present potential fire hazards should PVC sleeved electrical cables be subjected to . ..
excessive heat caused by, for example, a fire occurring in a room or ceiling area through which the electrical services pass. Overheating of conduit fittings such as dry lining boxes through which electric cables pass and within which electrical connections are made, for example, for wall mounted sockets, can cause self ignition of the cables; also, conduit...... ..
fittings subjected to excessive heat can rapidly deform thereby enabling. . - high temperature gases and flames to reach the cables and cause fires to occur. Fire damage to conduit fittings also enables fire and smoke to pass from one room of a building to another thereby aiding the spread of fire within that building. These problems are of increased concern in the context of timber framed properties.
The use of fibrous pads coated with intumescent material adhered to one internal wall of a conduit fitting is known from our patent GB 2247977B. The presence of such pads within a conduit fitting inhibits the spread of fire and smoke by intumescing completely to fill the fitting interior when subjected to temperature increases occasioned by fire. For timber framed properties particularly, there is an additional need to provide acoustic sound-proofing properties for conduit fittings.
Flexible expandable seals are known which comprise a preformed flexible cellular foam or sponge which has been impregnated with fire- retardant material. When subjected to temperatures of the order of 300 400 C such seals lose integrity thereby allowing flames to pass between the walls or other members between which the seal is positioned.
Expandable seals are also known which comprise layers of sponge and intumescent sheets. The sponge content of these seals deteriorates at temperatures around 200 C while the sheets expand. Seal flexibility is therefore substantially lost.
Improved flexible preformed fire-retardant seals are disclosed in our copending Application PCT/GB01/00323. These seals comprise preformed flexible cellular fire-retardant foam or sponge coated firstly with a primer solution including a sealant and secondly with a Plowable coating of a fire-retardant material. These seals offer enhanced fire protection and acoustic properties. . :.
Hitherto such seals have been employed in block form for use within, for example, wall cavities. It has now surprisingly been established that the fire-retardant and acoustic protection properties of the described preformed flexible cellular foam or sponge can be retained even when relatively thin sheets of this material are produced.
It has also been established that sheets of ceramic paper or felt coated with a fluid intumescent have good fire-proofing and sound deadening properties.
Our International Application WO 2004/013528 discloses a cover for a conduit fitting which comprises sheets of preformed flexible cellular fire retardant foam or sponge joined together by an intumescent adhesive to form a cover open on one of its sides and dimensioned to define a reasonably snug fit about the external walls of an open-sided conduit fitting. Each sheet is coated firstly with a primer solution including a sealant and secondly with a Plowable coating of a fire-retardant material.
The primer solution operates to close the open pores of the surface and provides a bond to which the fire-retardant coating can adhere.
Whereas these covers have proved to be extremely successful in providing security against the spread of fire with enhanced sound proofing qualities, it has been found that there is a need to ensure that movement between the cover and the protected conduit fitting is eliminated or, at least, minimised.
According to the present invention in one aspect, there is provided a cover for a conduit fitting for location within a wall recess which comprises sheets of preformed flexible cellular fire-retardant foam sponge joined together by an intumescent adhesive to form a cover open on one of its sides and dimensioned to define a reasonably snug fit about the external walls of an open-sided conduit fitting, and means for securing the cover to one or more of the walls which define the recess, each sheet of the cover being coated firstly with a primer solution including a sealant and secondly with a Plowable coating of a fire- retardant material, the - primer solution operating to close the open pores of the said at least one surface and to provide a bond to which the fire-retardant coating can adhere.
The securing means may comprise metallic fixing strips which extend from and generally normal to the base of the cover and protrude from the adjoining upstanding cover wall by a predetermined distance, the protruding end including an aperture through which a pin or screw can pass to secure the cover to the neighbouring edge of a wall in which the cover is positioned.
Preferably, the predetermined distance is equivalent to the thickness of a plasterboard sheet.
One object of this invention is to provide a fireproofed cover for conduit fittings such as dry lining boxes which can readily be positioned between and secured to adjoining plasterboard walls of timber framed properties.
All surfaces of the foam or sponge sheets may be coated.
The primer solution may comprise an aqueous solution of an acrylic copolymer which includes ammonium polyphosphate.
The fire-retardant coating may comprise a chlorinated vinyl copolymer system which includes a quantity of ammonium polyphosphate, zinc borate and/or magnesium and/or calcium carbonates. ... : :::.
The foam or sponge may comprise polyurethane or alternatively a silicone coated with a silane primer. :-
The primer solution may be allowed to dry before the fire-retardant. . material is applied. One or both coatings may be applied by brushing, . . - rolling or spraying.
The invention will now be described by way of example only with reference to the accompanying diagrammatic drawings, in which: Figure 1 is a plan view of a fireproofed cover in accordance with the invention; and Figure 2 is a side view of the fireproofed cover shown in Figure 1.
The cover illustrated in the drawings has walls 1 upstanding from a base 2 all cut from one or more sheets of polyurethane foam material impregnated with an aqueous solution of a fire-retardant material.
Extending upwardly from the base 2 are metallic fixing strips 3, the upper ends of which protrude beyond the upper margins of the walls by a predetermined distance, e.g. a distance generally equal to the thickness s of a standard plasterboard sheet. Each strip end includes a hole 4 to enable the fixing strips to be secured to the adjoining edge surface of a plasterboard or other wall surface when the cover and conduit fitting is positioned within a wall recess. The ends of the fixing strip remote from the holes 4 are turned through 90 to lie between the adjoining surface of the walls and the base.
In one example of a cover in accordance with the invention, the walls and base 2 are cut from sheets of polyurethane foam material impregnated with an aqueous solution of a fire-retardant material are coated with a solution of an acrylic copolymer system which includes ammonium polyphosphate. At temperatures in excess of 250 C to 300 C . the ammonium polyphosphate forms phosphoric acid which reacts with the fireretardant coating for the polyurethane sheets. This primer coating has a viscosity similar to that of water and acts to seal the open cells of the polyurethane foam. The primer coating therefore seals the exposed surfaces of the polyurethane sheets whilst retaining the flexibility characteristics of the sheets. The primer coating also provides a bond to which the subsequently applied fire retardant coating can adhere.
The surfaces of the sheets are then coated with one or more coatings of a chlorinated vinyl copolymer system which includes a quantity of ammonium polyphosphate, zinc borate and/or magnesium and/or calcium carbonates. The viscosity of this fire-retardant coating is more akin to an emulsion or paste.
The coatings may be applied by means of a brush, roller or spray.
The primer coating not only seals the open pores of the polyurethane block but also, as mentioned previously, provides a primed surface to which the fire-retardant coating can adhere. The coated sheets retain their flexibility and the bond between the respective coatings is sufficient to prevent cracking or other damage to the surface during handling of the sheets.
In some instances it may be preferable to allow the primer coating to dry before the fire-retardant coating is applied.
Once dried, the sheets are cut to sizes which approximate to the dimensions of the walls of the conduit fitting to be covered. The edges of the sheets are then adhered together using an intumescent adhesive to define an open-sided cover of a shape which matches the fitting to be covered but dimensioned marginally larger to enable the fitting to fit snugly within the cover.
Following assembly, the cover is inserted through an opening in, say, a plasterboard cavity wall to which a wall socket or the like is to be mounted. If necessary, the cover can, because of its inherent flexibility, be folded or screwed up to pass through the opening. Before entry of the cover, the area of internal wall of the opposed plasterboard cavity wall opposite the opening is coated with a layer of intumescent adhesive to retain the cover in place between the opposed cavity wall surfaces.
Openings or slots formed in the appropriate side of the cover enable electrical cabling to enter the cover interior. The required conduit fitting is then located within the cover and the cover is fixed in place by pins or screws passing through the holes 4 onto the adjoining side edges of the plasterboard.
Covers in accordance with the invention have enhanced sound- deadening properties which enable the covers to act as acoustic covers for conduit fittings.
In the event of fire, the intumescent contents of the cover, the adhesive and the pads located within the fitting expand to fill completely all spacings between the fitting and the adjoining wall surfaces and within the fitting itself to prevent the flow of fire or smoke between the adjoining rooms defined by the cavity wall. Fin A
It will be appreciated that the foregoing is merely exemplary of fireretardant seals in accordance with the invention and that various modifications can readily be made thereto without departing from the true scope of the invention. . .
- .e .. ..*. ë ë A.- .-
Claims (9)
1 A cover for a conduit fitting for location within a wall recess which comprises sheets of preformed flexible cellular fire-retardant foam sponge joined together by an intumescent adhesive to form a cover open on one of its sides and dimensioned to define a reasonably snug fit about the external walls of an open-sided conduit fitting, and means for securing the cover to one or more of the walls which define the recess, each sheet of the cover being coated firstly with a primer solution including a sealant and secondly with a flowable coating of a fire- retardant material, the primer solution operating to close the open pores of the said at least one surface and to provide a bond to which the fireretardant coating can adhere. .
2. A cover as claimed in claim 1 wherein the securing means comprises .
. metallic fixing strips which extend from and generally normal to the base of the cover and protrude from the adjoining upstanding cover wall by a predetermined distance, the protruding end including an aperture through which a pin or screw can pass to secure the cover to the neighbouring edge of a wall in which the cover is positioned. .e ë
3. A cover as claimed in claim 2 wherein the predetermined distance is equivalent to the thickness of a plasterboard sheet.
4. A cover as claimed in any one of the preceding claims wherein all surfaces of the foam or sponge sheets are coated firstly with the primer solution including a sealant and secondly with the flowable fire retardant material.
5. A cover as claimed in any one of the preceding claims wherein the primer solution comprises an aqueous solution of an acrylic copolymer which includes ammonium polyphosphate.
6. A cover as claimed in any one of the preceding claims wherein the fireretardant coating comprises a chlorinated vinyl copolymer system which includes a quantity of ammonium polyphosphate, zinc borate and/or magnesium and/or calcium carbonates.
7. A cover as claimed in any one of the preceding claims wherein the foam or sponge comprises polyurethane.
8. A cover as claimed in any one of claims 1 to 6 wherein the foam or sponge comprises a silicone coated with a silane primer.
9. A fire proofed cover substantially as herein described and as described with reference to the accompanying drawings ..
A :e ..
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB0421839A GB2418784A (en) | 2004-10-01 | 2004-10-01 | A fire resistant cover for an electrical conduit or socket. |
| GB0708671A GB2435576B (en) | 2004-10-01 | 2005-07-05 | Fireproofed covers for conduit fittings |
| PCT/GB2005/002619 WO2006037939A1 (en) | 2004-10-01 | 2005-07-05 | Fireproofed covers for conduit fittings |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB0421839A GB2418784A (en) | 2004-10-01 | 2004-10-01 | A fire resistant cover for an electrical conduit or socket. |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB0421839D0 GB0421839D0 (en) | 2004-11-03 |
| GB2418784A true GB2418784A (en) | 2006-04-05 |
Family
ID=33427904
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB0421839A Withdrawn GB2418784A (en) | 2004-10-01 | 2004-10-01 | A fire resistant cover for an electrical conduit or socket. |
| GB0708671A Expired - Fee Related GB2435576B (en) | 2004-10-01 | 2005-07-05 | Fireproofed covers for conduit fittings |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB0708671A Expired - Fee Related GB2435576B (en) | 2004-10-01 | 2005-07-05 | Fireproofed covers for conduit fittings |
Country Status (2)
| Country | Link |
|---|---|
| GB (2) | GB2418784A (en) |
| WO (1) | WO2006037939A1 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2449088A (en) * | 2007-05-09 | 2008-11-12 | V Cut Ltd | Insulation device for electrical outlets |
| EP3646922A3 (en) * | 2018-10-29 | 2020-07-29 | Martin Elze | Fire protection construction or fire protection system for wrapping a cable or a line and corresponding uses |
| GB2582544A (en) * | 2019-03-14 | 2020-09-30 | Hoody Speaker Hoods Ltd | Covers for electrical appliances |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2583735A (en) | 2019-05-07 | 2020-11-11 | Intumescent Systems Ltd | Cable trays |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4087624A (en) * | 1976-05-17 | 1978-05-02 | Hitchcock Robert A | Fire shield for electrical box |
| US4616104A (en) * | 1984-11-16 | 1986-10-07 | Lindsey Travis C | Fire resistant electrical junction boxes |
| US4667840A (en) * | 1984-11-16 | 1987-05-26 | Lindsey Travis C | Fire-resistant electrical junction boxes and method of manufacture |
| GB2277871A (en) * | 1993-05-14 | 1994-11-16 | Environmental Seals Ltd | Fire resistant containers |
| JP2002209321A (en) * | 2001-01-10 | 2002-07-26 | Sekisui Chem Co Ltd | Fire preventing and resisting construction of flush-type box |
| GB2391716A (en) * | 2002-08-02 | 2004-02-11 | Environmental Seals Ltd | Fire retardant cover for a conduit |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB9019975D0 (en) | 1990-09-12 | 1990-10-24 | Smiths Industries Plc | Display assemblies |
| US5498466A (en) * | 1993-03-12 | 1996-03-12 | International Protective Coatings Corp. | Intumescent composite |
| GB9501391D0 (en) * | 1995-01-25 | 1995-03-15 | Environmental Seals Ltd | Ventilated covers for electrical fittings |
| EP0982522A3 (en) * | 1998-08-19 | 2001-05-16 | Friatec Aktiengesellschaft | Fire stop device |
| GB2359265B (en) | 2000-02-18 | 2003-09-03 | Environmental Seals Ltd | Flexible seal |
-
2004
- 2004-10-01 GB GB0421839A patent/GB2418784A/en not_active Withdrawn
-
2005
- 2005-07-05 WO PCT/GB2005/002619 patent/WO2006037939A1/en active Application Filing
- 2005-07-05 GB GB0708671A patent/GB2435576B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4087624A (en) * | 1976-05-17 | 1978-05-02 | Hitchcock Robert A | Fire shield for electrical box |
| US4616104A (en) * | 1984-11-16 | 1986-10-07 | Lindsey Travis C | Fire resistant electrical junction boxes |
| US4667840A (en) * | 1984-11-16 | 1987-05-26 | Lindsey Travis C | Fire-resistant electrical junction boxes and method of manufacture |
| GB2277871A (en) * | 1993-05-14 | 1994-11-16 | Environmental Seals Ltd | Fire resistant containers |
| JP2002209321A (en) * | 2001-01-10 | 2002-07-26 | Sekisui Chem Co Ltd | Fire preventing and resisting construction of flush-type box |
| GB2391716A (en) * | 2002-08-02 | 2004-02-11 | Environmental Seals Ltd | Fire retardant cover for a conduit |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2449088A (en) * | 2007-05-09 | 2008-11-12 | V Cut Ltd | Insulation device for electrical outlets |
| GB2449088B (en) * | 2007-05-09 | 2012-03-07 | V Cut Ltd | Insulation device for insertion into a wall requiring insulation |
| EP3646922A3 (en) * | 2018-10-29 | 2020-07-29 | Martin Elze | Fire protection construction or fire protection system for wrapping a cable or a line and corresponding uses |
| GB2582544A (en) * | 2019-03-14 | 2020-09-30 | Hoody Speaker Hoods Ltd | Covers for electrical appliances |
| GB2582544B (en) * | 2019-03-14 | 2022-03-30 | Hoody Speaker Hoods Ltd | Covers for electrical appliances |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2006037939A1 (en) | 2006-04-13 |
| GB2435576B (en) | 2008-11-05 |
| GB0421839D0 (en) | 2004-11-03 |
| GB2435576A (en) | 2007-08-29 |
| GB0708671D0 (en) | 2007-06-20 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |