WO2006097737A2 - Electrical device - Google Patents

Electrical device Download PDF

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Publication number
WO2006097737A2
WO2006097737A2 PCT/GB2006/000951 GB2006000951W WO2006097737A2 WO 2006097737 A2 WO2006097737 A2 WO 2006097737A2 GB 2006000951 W GB2006000951 W GB 2006000951W WO 2006097737 A2 WO2006097737 A2 WO 2006097737A2
Authority
WO
WIPO (PCT)
Prior art keywords
live
connection
fuse
inbound
switched
Prior art date
Application number
PCT/GB2006/000951
Other languages
French (fr)
Other versions
WO2006097737A3 (en
Inventor
Paul Myerson
Original Assignee
Paul Myerson
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 Paul Myerson filed Critical Paul Myerson
Publication of WO2006097737A2 publication Critical patent/WO2006097737A2/en
Publication of WO2006097737A3 publication Critical patent/WO2006097737A3/en

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H85/00—Protective devices in which the current flows through a part of fusible material and this current is interrupted by displacement of the fusible material when this current becomes excessive
    • H01H85/02—Details
    • H01H85/46—Circuit arrangements not adapted to a particular application of the protective device

Definitions

  • the present invention relates to an electrical device, particularly for connection to an extractor fan with an overrun timer.
  • Extractor fans of the kind that are used in public and domestic toilets are often connected in parallel with the lighting for the toilet. Such fans are often fitted with an overrun timer which allows the fan to continue to operate even after the lights have been switched off.
  • the fan is provided with a neutral connection, a permanent live connection and a switched live connection which is interrupted by the light switch.
  • the fan continues to be powered by the permanent live connection for a period of time controlled by the overrun timer.
  • the present invention provides a simple electrical device which can protect both the permanent live and the switched live connections of an extractor fan with a single fuse.
  • an electrical device for connection between respective inbound neutral, permanent live and switched live connections and respective outbound neutral, permanent live and switched live connections.
  • the device comprises: a fuse device between the inbound permanent live connection and the outbound permanent live connection; a switch controller between the inbound switched live connection and a neutral connection; a switch operable by the switch controller in use to connect the inbound permanent live via the fuse device to the outbound switched live connection, whereby the fuse device protects both the outbound permanent live connection and the outbound switched live connection.
  • the supply to the outbound switched live connection is provided from the inbound permanent live connection via the fuse device and the controlled switch.
  • the controlled switch is closed when the switch controller is energised by current between the inbound switched live connection and the outbound neutral connection.
  • a single fuse device protects both the outbound permanent live connection and the outbound switched live connection.
  • the switch controller may be any device that is capable of closing the switch when supplied with current.
  • the switch controller may be a suitable electronic device.
  • the switch controller is a relay coil.
  • the fuse device may be any device that is capable of interrupting current flow in response to excessive current through the fuse device.
  • the fuse device may be a circuit breaker, preferably a miniature circuit breaker.
  • the fuse device is a fuse.
  • the electrical device is contained within a housing that includes access for the inbound and outbound connections.
  • the device may be contained within a housing corresponding in size to that for a standard fuse spur.
  • standard fuse spurs and sockets are defined, for example, in British Standards BS4662 and BS1363 and European Norm EN60669.1
  • the electrical device may comprise an isolator switch arranged to break at least one of the inbound connections.
  • the isolator switch is arranged to break at least the inbound live connections.
  • the isolator switch is a three-pole single throw isolator switch arranged to break each of the inbound connections.
  • the isolator switch is located in the housing of the electrical device to provide a combined isolator switch and fuse. Desirably, this housing corresponds in size to a standard switch box or fuse spur.
  • Figure 1 is a circuit diagram showing the connection of a lamp and extractor fan to a mains supply
  • Figure 2 is a circuit diagram in which the electrical device according to an embodiment of the invention has been incorporated into the circuit of Figure 1.
  • Figure 1 illustrates a known configuration for connection of a lamp 1 and an extractor fan 2 to a mains supply 3.
  • the live connection L from the mains supply 3 is protected by a main fuse 4.
  • the main fuse 4 protects both the lamp 1 and the extractor fan 2. Consequently, the main fuse 4 must be rated sufficiently highly that it does not trip under normal operation of the lamp 1 (or lamps). Typically therefore, a three amp fuse is used in this position.
  • a two-pole, single-throw isolator switch 5 In series with the main fuse 4 is a two-pole, single-throw isolator switch 5 which can interrupt both the neutral N and live L connections from the mains supply 3.
  • the lamp 1 is connected in parallel between the neutral connection N from the two-pole isolator switch 5 and a switched live connection Ls in a ceiling junction 6.
  • the live connection L from the two-pole isolator switch 5 is connected to a pull switch 7.
  • the pull switch 7 is connected between the live connection at the ceiling junction 6 and the switched live connection at the ceiling junction 6. Consequently, when the pull switch 7 is closed, the switched live connection is live and the lamp 1 lights. When the pull switch 7 is open, the switched live connection is broken and the lamp 1 is off.
  • the pull switch 7 is by way of example only and any other type of switch could also be used.
  • the circuit shown in Figure 1 further includes a three-pole, single-throw isolator switch 8 which is connected to the neutral N, switched live Ls and live L connections at the ceiling junction 6.
  • the extractor fan 2 has three electrical connections: a permanent live connection L, a switched live connection Ls and a neutral connection N.
  • the live L, switched live Ls and neutral N connections of the extractor fan 2 are connected to the corresponding outbound connections of the three-pole isolator switch 8, such that the three-pole isolator switch 8 can make or break all connections to the extractor fan 2.
  • the three-pole isolator switch 8 is a recommended, but optional, component of the circuit and allows the extractor fan 2 to be electrically isolated for maintenance.
  • the permanent live connection L provides the power to the motor of the extractor fan 2.
  • the pull switch 7 When the pull switch 7 is activated, the switched live connection Ls goes live and the extractor fan 2 begins to operate.
  • the supply to the switched live connection Ls is interrupted by opening of the pull switch 7, the extractor fan 2 continues to operate under the control of an overrun timer for a predetermined period of time.
  • the extractor fan 2 is protected by a single fuse to the live L and switched live Ls connections.
  • the only fuse is the three amp main fuse 4 which protects all live connections, but when tripped interrupts the power supply to both the lamp 1 and the extractor fan 2. This is undesirable in a bathroom or toilet installation, where the malfunction of the extractor fan 2 could result in darkness.
  • FIG. 2 shows a circuit diagram incorporating the invention. Corresponding components are given the same reference numerals as in Figure 1 and will not be described in detail for the avoidance of repetition.
  • the three-pole isolator switch is provided in a housing, together with a relay 9 and a fan fuse 10.
  • the fan fuse 10 is a one or two amp fuse conforming to British Standard 1362.
  • the fan fuse 10 is connected between the live switch of the three-pole isolator switch 8 and the live connection L to the extractor fan 2.
  • the switch 9b of the relay 9 is connected between the fan fuse 10 and the switched live connection of the extractor fan 2.
  • the coil 9a of the relay 9 is connected between the switched live switch of the three-pole isolator switch 8 and the neutral connection N to the extractor fan 2.
  • the relay coil 9a When the switched live connection Ls from the ceiling junction 6 is live, the relay coil 9a is energised and closes the relay switch 9b to provide power from the permanent live connection L at the ceiling junction 6 to the switched live connection Ls of the extractor fan 2 via the fan fuse 10. When the power to the switched live connection Ls at the ceiling junction 6 is interrupted, the relay coil 9a is not energised and the relay switch 9b is open, interrupting the switched live connection Ls to the extractor fan 2.
  • the fan fuse 10 breaks the connection to both the live L and switched live Ls connections of the extractor fan 2. In this way, a single fan fuse 10 protects both the live L and switched live Ls connections of the extractor fan 2, without interrupting the power supply to the lamp 1.
  • the isolator switch 8, fan fuse 10 and relay 9 are provided in a single housing corresponding in size to a standard switch box or fuse spur. In this way, the device according to the invention can easily replace an existing three-pole isolator switch 8. Alternatively, the device may also be housed in a double socket sized housing. It will be appreciated that it is not necessary for the relay coil 9a to be connected to the neutral connection N of the extractor fan 2. It is only necessary that the relay coil 9a is energised when the switched live connection Ls from the ceiling junction 6 is live. For example, it is possible for the relay coil 9a to be connected between a switched live connection and an earth connection or a separate neutral connection.
  • the three-pole isolator switch 8 has been included in the housing for the fan fuse 10 and the relay 9 in the embodiment shown, this is not essential.
  • the fan fuse 10 and the relay 9 may be included in a separate housing with the three-pole isolator switch 8 provided separately, if at all.
  • the three-pole isolator switch 8 may be in the form of a pull cord switch. In this case, the device may be housed in a pull cord switch housing.
  • an electrical device for connection between respective inbound neutral, permanent live and switched live connections and the neutral, permanent live and switched live connections of an extractor fan with an overrun timer.
  • a fuse is provided between the inbound permanent live connection and the permanent live connection of the extractor fan
  • a relay coil is provided between the inbound switched live connection and a neutral connection.
  • a switch is operated by the relay coil to connect the inbound permanent live via the fuse to the switched live connection of the extractor fan. In this way, the fuse protects both the live and switched live connections of the extractor fan.

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Abstract

An electrical device for connection between respective inbound neutral N5 permanent live L and switched live Ls connections and the neutral N5 permanent live L and switched live Ls connections of an extractor fan (2) with an overrun timer. A fuse (10) is provided between the inbound permanent live connection and the permanent live connection of the extractor fan (2). A relay coil (9a) is provided between the inbound switched live connection Ls and a neutral connection. A switch (9b) is operated by the relay coil (9a) to connect the inbound permanent live connection via the fuse (10) to the switched live connection of the extractor fan (2). In this way, the fuse (10) protects both the live and switched live connections of the extractor fan (2).

Description

ELECTRICAL DEVICE
Field of the Invention
The present invention relates to an electrical device, particularly for connection to an extractor fan with an overrun timer.
Extractor fans of the kind that are used in public and domestic toilets are often connected in parallel with the lighting for the toilet. Such fans are often fitted with an overrun timer which allows the fan to continue to operate even after the lights have been switched off.
The fan is provided with a neutral connection, a permanent live connection and a switched live connection which is interrupted by the light switch. When the power supply to the switched live connection is interrupted, the fan continues to be powered by the permanent live connection for a period of time controlled by the overrun timer.
It is desirable to protect such extractor fans with the same fuse for both the permanent live and the switch live. However, in many commercial installations this is not practical as the extractor fan circuit includes a lighting load. Consequently, if a single fuse is located - - -between the live-supply and the lighting load to-protect-th& extractor fan, the- supply to the lights will also be interrupted when the fuse blows. The present invention provides a simple electrical device which can protect both the permanent live and the switched live connections of an extractor fan with a single fuse.
According to the present invention, there is provided an electrical device for connection between respective inbound neutral, permanent live and switched live connections and respective outbound neutral, permanent live and switched live connections. The device comprises: a fuse device between the inbound permanent live connection and the outbound permanent live connection; a switch controller between the inbound switched live connection and a neutral connection; a switch operable by the switch controller in use to connect the inbound permanent live via the fuse device to the outbound switched live connection, whereby the fuse device protects both the outbound permanent live connection and the outbound switched live connection.
According to the invention, the supply to the outbound switched live connection is provided from the inbound permanent live connection via the fuse device and the controlled switch. The controlled switch is closed when the switch controller is energised by current between the inbound switched live connection and the outbound neutral connection. In this way, a single fuse device protects both the outbound permanent live connection and the outbound switched live connection.
The switch controller may be any device that is capable of closing the switch when supplied with current. For example, the switch controller may be a suitable electronic device. In the presently preferred embodiment, the switch controller is a relay coil.
The fuse device may be any device that is capable of interrupting current flow in response to excessive current through the fuse device. For example, the fuse device may be a circuit breaker, preferably a miniature circuit breaker. In the presently preferred embodiment, the fuse device is a fuse.
Desirably, the electrical device is contained within a housing that includes access for the inbound and outbound connections. For example, the device may be contained within a housing corresponding in size to that for a standard fuse spur. The configuration of standard fuse spurs and sockets are defined, for example, in British Standards BS4662 and BS1363 and European Norm EN60669.1
Conveniently, the electrical device may comprise an isolator switch arranged to break at least one of the inbound connections. Preferably, the isolator switch is arranged to break at least the inbound live connections. In the presently preferred embodiment, the isolator switch is a three-pole single throw isolator switch arranged to break each of the inbound connections.
Desirably, the isolator switch is located in the housing of the electrical device to provide a combined isolator switch and fuse. Desirably, this housing corresponds in size to a standard switch box or fuse spur.
Brief Description of the Figures
An embodiment of the invention will now be described by way of example only, and with reference to the accompanying drawings, in which:
Figure 1 is a circuit diagram showing the connection of a lamp and extractor fan to a mains supply;
Figure 2 is a circuit diagram in which the electrical device according to an embodiment of the invention has been incorporated into the circuit of Figure 1.
Detailed Description of the Figures
Figure 1 illustrates a known configuration for connection of a lamp 1 and an extractor fan 2 to a mains supply 3.
As shown in Figure 1, the live connection L from the mains supply 3 is protected by a main fuse 4. The main fuse 4 protects both the lamp 1 and the extractor fan 2. Consequently, the main fuse 4 must be rated sufficiently highly that it does not trip under normal operation of the lamp 1 (or lamps). Typically therefore, a three amp fuse is used in this position. In series with the main fuse 4 is a two-pole, single-throw isolator switch 5 which can interrupt both the neutral N and live L connections from the mains supply 3.
The lamp 1 is connected in parallel between the neutral connection N from the two-pole isolator switch 5 and a switched live connection Ls in a ceiling junction 6. In the ceiling junction 6, the live connection L from the two-pole isolator switch 5 is connected to a pull switch 7. The pull switch 7 is connected between the live connection at the ceiling junction 6 and the switched live connection at the ceiling junction 6. Consequently, when the pull switch 7 is closed, the switched live connection is live and the lamp 1 lights. When the pull switch 7 is open, the switched live connection is broken and the lamp 1 is off. The pull switch 7 is by way of example only and any other type of switch could also be used.
The circuit shown in Figure 1 further includes a three-pole, single-throw isolator switch 8 which is connected to the neutral N, switched live Ls and live L connections at the ceiling junction 6. The extractor fan 2 has three electrical connections: a permanent live connection L, a switched live connection Ls and a neutral connection N. The live L, switched live Ls and neutral N connections of the extractor fan 2 are connected to the corresponding outbound connections of the three-pole isolator switch 8, such that the three-pole isolator switch 8 can make or break all connections to the extractor fan 2. The three-pole isolator switch 8 is a recommended, but optional, component of the circuit and allows the extractor fan 2 to be electrically isolated for maintenance.
The permanent live connection L provides the power to the motor of the extractor fan 2. When the pull switch 7 is activated, the switched live connection Ls goes live and the extractor fan 2 begins to operate. When the supply to the switched live connection Ls is interrupted by opening of the pull switch 7, the extractor fan 2 continues to operate under the control of an overrun timer for a predetermined period of time.
It is generally recommended that the extractor fan 2 is protected by a single fuse to the live L and switched live Ls connections. In the circuit shown in Figure 1, the only fuse is the three amp main fuse 4 which protects all live connections, but when tripped interrupts the power supply to both the lamp 1 and the extractor fan 2. This is undesirable in a bathroom or toilet installation, where the malfunction of the extractor fan 2 could result in darkness.
Figure 2 shows a circuit diagram incorporating the invention. Corresponding components are given the same reference numerals as in Figure 1 and will not be described in detail for the avoidance of repetition.
As shown in Figure 2, the three-pole isolator switch is provided in a housing, together with a relay 9 and a fan fuse 10. According to the invention, the fan fuse 10 is a one or two amp fuse conforming to British Standard 1362. The fan fuse 10 is connected between the live switch of the three-pole isolator switch 8 and the live connection L to the extractor fan 2. In parallel with the live connection L to the extractor fan 2, the switch 9b of the relay 9 is connected between the fan fuse 10 and the switched live connection of the extractor fan 2. The coil 9a of the relay 9 is connected between the switched live switch of the three-pole isolator switch 8 and the neutral connection N to the extractor fan 2.
When the switched live connection Ls from the ceiling junction 6 is live, the relay coil 9a is energised and closes the relay switch 9b to provide power from the permanent live connection L at the ceiling junction 6 to the switched live connection Ls of the extractor fan 2 via the fan fuse 10. When the power to the switched live connection Ls at the ceiling junction 6 is interrupted, the relay coil 9a is not energised and the relay switch 9b is open, interrupting the switched live connection Ls to the extractor fan 2.
In the event of a power surge, the fan fuse 10 breaks the connection to both the live L and switched live Ls connections of the extractor fan 2. In this way, a single fan fuse 10 protects both the live L and switched live Ls connections of the extractor fan 2, without interrupting the power supply to the lamp 1.
Conveniently, the isolator switch 8, fan fuse 10 and relay 9 are provided in a single housing corresponding in size to a standard switch box or fuse spur. In this way, the device according to the invention can easily replace an existing three-pole isolator switch 8. Alternatively, the device may also be housed in a double socket sized housing. It will be appreciated that it is not necessary for the relay coil 9a to be connected to the neutral connection N of the extractor fan 2. It is only necessary that the relay coil 9a is energised when the switched live connection Ls from the ceiling junction 6 is live. For example, it is possible for the relay coil 9a to be connected between a switched live connection and an earth connection or a separate neutral connection.
Furthermore, although the three-pole isolator switch 8 has been included in the housing for the fan fuse 10 and the relay 9 in the embodiment shown, this is not essential. For example, the fan fuse 10 and the relay 9 may be included in a separate housing with the three-pole isolator switch 8 provided separately, if at all. The three-pole isolator switch 8 may be in the form of a pull cord switch. In this case, the device may be housed in a pull cord switch housing.
In summary, there is disclosed herein an electrical device for connection between respective inbound neutral, permanent live and switched live connections and the neutral, permanent live and switched live connections of an extractor fan with an overrun timer.
A fuse is provided between the inbound permanent live connection and the permanent live connection of the extractor fan A relay coil is provided between the inbound switched live connection and a neutral connection. A switch is operated by the relay coil to connect the inbound permanent live via the fuse to the switched live connection of the extractor fan. In this way, the fuse protects both the live and switched live connections of the extractor fan.

Claims

1. An electrical device for connection between respective inbound neutral, permanent live and switched live connections and respective outbound neutral, permanent live and switched live connections, the device comprising: a fuse device between the inbound permanent live connection and the outbound permanent live connection; a switch controller between the inbound switched live connection and a neutral connection; a switch operable by the switch controller in use to connect the inbound permanent live via the fuse device to the outbound switched live connection, whereby the fuse device protects both the outbound permanent live connection and the outbound switched live connection.
2. An electrical device as claimed in claim 1, wherein the switch controller is a relay coil.
3. An electrical device as claimed in claim 1 or 2, wherein the fuse device is a fuse.
4. An electrical device as claimed in any preceding claim further comprising a three- pole, single-throw isolator switch arranged to break each of the inbound connections.
5. An electrical device as claimed in any preceding claim contained within a housing which includes access for the inbound and outbound connections.
6. An electrical device as claimed in any preceding claim, wherein the outbound connections are connected to an extractor fan with an overrun timer and the inbound switched live connection and the inbound neutral connection are connected in parallel with a lamp.
7. An electrical device as claimed in any preceding claim configured to operate at mains voltage.
PCT/GB2006/000951 2005-03-17 2006-03-16 Electrical device WO2006097737A2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0505458.0 2005-03-17
GB0505458A GB2424320B (en) 2005-03-17 2005-03-17 Fuse device for protecting both live and switched live connections

Publications (2)

Publication Number Publication Date
WO2006097737A2 true WO2006097737A2 (en) 2006-09-21
WO2006097737A3 WO2006097737A3 (en) 2006-11-16

Family

ID=34509201

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB2006/000951 WO2006097737A2 (en) 2005-03-17 2006-03-16 Electrical device

Country Status (2)

Country Link
GB (1) GB2424320B (en)
WO (1) WO2006097737A2 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2512946B (en) * 2013-04-14 2016-10-05 Cole Roger Three Pole Fused Fan And Light Switch

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2133588A (en) * 1982-12-21 1984-07-25 Greenwood Airvac Ventilation Improvements in or relating to apparatus for controlling a ventilation fan
GB2296609A (en) * 1994-12-08 1996-07-03 Darren John Spreyer The double fuse spur
GB2302221A (en) * 1995-06-13 1997-01-08 Barry Conway Room ventilating system
DE20317930U1 (en) * 2003-11-20 2004-02-12 Gärtner, Erich Safety ventilation system uses blower to supply fresh air to enclosed space when controller receives a signal from a condition monitoring sensor

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB9604053D0 (en) * 1996-02-27 1996-05-01 Hi Tec Services Ltd Fan control circuitry

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2133588A (en) * 1982-12-21 1984-07-25 Greenwood Airvac Ventilation Improvements in or relating to apparatus for controlling a ventilation fan
GB2296609A (en) * 1994-12-08 1996-07-03 Darren John Spreyer The double fuse spur
GB2302221A (en) * 1995-06-13 1997-01-08 Barry Conway Room ventilating system
DE20317930U1 (en) * 2003-11-20 2004-02-12 Gärtner, Erich Safety ventilation system uses blower to supply fresh air to enclosed space when controller receives a signal from a condition monitoring sensor

Also Published As

Publication number Publication date
GB2424320A (en) 2006-09-20
GB2424320B (en) 2007-02-21
GB0505458D0 (en) 2005-04-20
WO2006097737A3 (en) 2006-11-16

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