GB2531017A - Electrical test point for boiler - Google Patents

Electrical test point for boiler Download PDF

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Publication number
GB2531017A
GB2531017A GB1417717.4A GB201417717A GB2531017A GB 2531017 A GB2531017 A GB 2531017A GB 201417717 A GB201417717 A GB 201417717A GB 2531017 A GB2531017 A GB 2531017A
Authority
GB
United Kingdom
Prior art keywords
plug
tester
boiler
live
indicator
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Withdrawn
Application number
GB1417717.4A
Other versions
GB201417717D0 (en
Inventor
Regan-Stansfield John
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.)
BDR Thermea Group BV
Original Assignee
BDR Thermea Group BV
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 BDR Thermea Group BV filed Critical BDR Thermea Group BV
Priority to GB1417717.4A priority Critical patent/GB2531017A/en
Publication of GB201417717D0 publication Critical patent/GB201417717D0/en
Publication of GB2531017A publication Critical patent/GB2531017A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H9/00—Details
    • F24H9/20—Arrangement or mounting of control or safety devices
    • F24H9/2007—Arrangement or mounting of control or safety devices for water heaters
    • F24H9/2014—Arrangement or mounting of control or safety devices for water heaters using electrical energy supply
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H15/00—Control of fluid heaters
    • F24H15/10—Control of fluid heaters characterised by the purpose of the control
    • F24H15/124—Preventing or detecting electric faults, e.g. electric leakage
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H15/00—Control of fluid heaters
    • F24H15/30—Control of fluid heaters characterised by control outputs; characterised by the components to be controlled
    • F24H15/395—Information to users, e.g. alarms
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/145—Indicating the presence of current or voltage
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
    • G01R31/66—Testing of connections, e.g. of plugs or non-disconnectable joints
    • G01R31/67—Testing the correctness of wire connections in electric apparatus or circuits
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)

Abstract

The invention relates to a plug-in tester for checking an electrical supply to a boiler and methods of using such apparatus. The plug-in tester includes a housing 1 and an indicator on the housing (17, 18, 19, 20), such as a visual indicator (e.g an LED) or an audible indicator (e.g a speaker). The plug-in tester is removably connectable to a test connection on the boiler. The plug-in tester includes means, possibly via a plug 10 for making an electrical contact with live and neutral conductors carrying current to and from the boiler when the plug-in tester is connected to the test connection. The plug-in tester is configured to detect, and signal using the indicator, when power is being supplied to the boiler. In another aspect the plug-in tester is configured to detect, and signal using the indicator, if the live and neutral conductors supplying current to and from the boiler are correctly wired by checking the phase rotation of the electrical supply. A plug in tester for tripping a circuit breaker, or blowing a fuse, of an electrical supply to a boiler is also described.

Description

Electrical Test Point for Boiler
Field of the Invention
This invention relates to a plug-in electrical tester for a boiler.
Background to the Invention
Boilers are used in a variety of domestic and commercial situations to supply heated fluid (e.g. water) to consumers. The boilers must be periodically maintained which, for safety reasons, is likely to involve turning off the electricity supply to the boiler. In an increasingly health and safety conscious culture, it is a requirement to make sure that, before beginning work on the boiler, no power is being supplied to the boiler from the mains, and that there are no additional sources supplying electricity to the boiler.
Although normally boilers should only be connected to one supply, it has been found that some installers and/or maintenance people connect up additional supplies, e.g. so that they can test components without switching on the main boiler controls. These additional supplies are sometimes then left connected, so that subsequently switching off the main electrical supply switch does not completely isolate the boiler.
Generally, the checking of the electrical supply is carried out manually by the operator at specific times during the maintenance and there is not a continuous checking mechanism in place.
In addition, once maintenance work has been completed, the electricity supply will need to be reconnected and it is important to make sure that the live, neutral and earth connections are made correctly and that the phase rotation is checked. For example, some boilers may be able to operate with the live and neutral connections swapped over, but this would give rise to a potentially unsafe condition.
The present invention has therefore been devised with the foregoing in mind. The invention seeks to overcome or ameliorate at least one of the disadvantages of the
prior art, or provide a useful alternative.
Summary of the Invention
According to one aspect of the present invention there is provided a plug-in tester for checking a status of an electrical supply to a boiler comprising a housing and an indicator on the housing. The plug-in tester is removably connectable to a test connection on the boiler. The plug-in tester includes means for making an electrical contact with live and neutral conductors carrying current to and from the boiler when the plug-in tester is connected to the test connection. The plug-in tester is configured to detect, and signal using the indicator, when power is being supplied to the boiler.
The indicator may be in electrical contact with the live and neutral conductors carrying current to and from the boiler.
The indicator may comprise a first indicator and a second indicator. The first indicator may comprise a lamp and the second indicator may comprise a sounder.
The boiler may be supplied with electrical power from at least one additional supply.
It is an advantage that by simply plugging in the tester to the connection point on the boiler a maintenance operator can instantly know if the boiler has been completely isolated from any and all electrical supplies.
According to another aspect of the present invention there is provided a plug-in tester for checking the phase rotation of an electrical supply to a boiler, the plug-in tester comprising a housing and an indicator on the housing. The plug-in tester is removably connectable to a test connection on the boiler. The plug-in tester includes means for making an electrical contact with live and neutral conductors carrying current to and from the boiler when the plug-in tester is connected to the test connection. The plug-in tester is configured to detect, and signal using the indicator, if the live and neutral conductors supplying current to and from the boiler are correctly wired.
The indicator may comprise a third indicator and a fourth indicator. The third indicator may be in electrical contact with an earth conductor and the live conductor carrying current to the boiler. The fourth indicator may be in electrical contact with an earth conductor and the neutral conductor carrying current from the boiler. The third and fouith indicators may each comprise a lamp or a sounder.
It is advantage that the tester will immediately signal to the operator if the live and neutral connections have been incorrectly connected.
According to another aspect of the present invention there is provided a plug-in tester for tripping a circuit breaker, or blowing a fuse, of an electrical supply to a boiler, the plug-in tester comprising a housing, an indicator on the housing and a switch. The plug-in tester is removably connectable to a test connection on the boiler. The plug-in tester includes means for making an electrical contact with live and neutral conductors carrying current to and from the boiler when the plug-in tester is connected to the test connection. The switch is configured to make a connection between the live and neutral conductors for tripping the circuit breaker or blowing the fuse when current flows through the live conductor.
It is an advantage that the tester protects the operator if for any reason electrical power is switched back on while the plug-in tester is in place.
According to another aspect of the present invention there is provided a method of checking a status of an electrical supply to a boiler using a plug-in tester, the method comprising: connecting the plug-in tester to a connection point on the boiler thereby making an electrical contact between the plug-in tester and live and neutral conductors carrying current to and from the boiler; detecting whether power is being supplied to the boiler; and indicating on a housing of the plug-in tester if power is being supplied to the boiler.
According to another aspect of the present invention there is provided a method of checking the phase rotation of an electrical supply to a boiler using a plug-in tester, the method comprising: connecting the plug-in tester to a connection point on the boiler thereby making an electrical contact between the plug-in tester and live and neutral conductors carrying current to and from the boiler; detecting whether the live and neutral conductors supplying current to and from the boiler are correctly wired; and indicating on a housing of the plug-in tester if the live and neutral conductors supplying current to and from the boiler are correctly wired.
According to another aspect of the present invention there is provided a method of tripping a circuit breaker or blowing a fuse of an electrical supply to a boiler using a plug-in tester, the method comprising: connecting the plug-in tester to a connection point on the boiler thereby making an electrical contact between the plug-in tester and live and neutral conductors carrying current to and from the boiler; and making an electrical connection between the live and neutral conductors in the plug in tester using a switch so that the circuit breaker will trip or the fuse will blow when current flows through the live conductor.
Brief Description of the drawings
An embodiment of the invention will now be described, by way of example only, with reference to the accompanying drawings in which: Figure 1 shows a block diagram of a boiler, sources of electricity for the boiler and a connection point on the boiler for the plug-in tester of the embodiment of Figure 2; Figure 2 shows a block diagram of the plug-in tester in accordance with an embodiment of the present invention; Figure 3 shows a circuit diagram of the plug-in tester of the embodiment of Figure 2;
Description of the embodiments of the invention
Figure 1 shows a connection point 3 for a plug-in tester 1 (not shown) on a boiler 2.
The boiler 2 is supplied electricity from a mains supply 4 and, potentially, an additional supply 6. A mains switch 7 is located between the mains supply 4 and the boiler 2.
Mains supply 4 is typically the mains supply of the premises at which the boiler is installed, and would normally include circuit protection in the form of a circuit breaker or a fuse. The electricity from the mains supply 4 and the additional supply 6 is fed to a control printed circuit board (PCB) 8 in the boiler 2. Connecting the mains supply 4 to the boiler 2 are live U, neutral Ni and earth Ei wires. Connecting the additional supply 6 to the boiler 2 are live L2, neutral N2 and earth E2 wires.
Referring now to Figure 2, the plug-in tester 1 is now shown with a plug-in connector 10. In other embodiments, the plug-in connector iO could be integral to the plug-in tester i. The plug-in tester 1 is in direct electrical contact with the live U, neutral Ni and earth El wires. The plug-in tester 1 is connected to the live U, neutral Ni and earth El conductors/wires, in the form of a safety shunt, through live L3, neutral N3 and earth E3 wires. The plug-in connector 10 is configured to be able to plug into the connection point 3 on the boiler 2 and make a connection to the live U, neutral Ni and earth El wires. The plug-in connector i0 both physically and electrically connects the plug-in tester ito the boiler 2. The plug-in connector 10 is in direct electrical contact with the live U, neutral Nl and earth El wires. The plug-in connector 10 may comprise an arrangement of three pins or terminals, one for live (live pin ii), one for neutral (neutral pin 12) and one for earth (earth pin 13) that are inserted into corresponding sockets in the connection point 3, such that the correct connections are always made.
A cable 14 is located between the plug-in connector 10 and the plug-in tester ito make the electrical connection. The plug-in tester 1 comprises a safety switch 16, an audible indicator or sounder 17, and visual indicators such as neon lamps, including a first lamp 18, a second lamp 19 and a third lamp 20. Conventionally, the first lamp 18 is orange, the second lamp 19 is green and the third lamp 20 is red. Other colours of lamps, or other types of visual indicators may be used. In other embodiments, the plug-in tester 1 may only include only visual indicators, only audible indicators, or different numbers of visual and/or audible indicators.
Figure 3 shows a simple circuit diagram of the internals of the plug-in tester 1. The live L, neutral N and earth E connections are shown with corresponding live L4, neutral N4 and earth E4 wires. Also, the safety switch 16, the sounder 17, the first lamp 18, the second lamp 19 and the third lamp 20 are shown. The safety switch 16, first lamp 18 and sounder 17 are all connected to the live L4 and neutral N4 wires in parallel. The second lamp 19 is connected between the live L4 and earth E4 wires. The third lamp is connected between the neutral N4 and earth E4 wires.
In use, once the mains switch 7 is turned off and no electricity is being supplied to the boiler 2, the plug-in tester 1 is connected to the connector 0 on the boiler 2 via the plug-in connector 10. Each of the three pins, live pin 11, neutral pin 12 and earth pin 13, of the plug-in connector 10 makes an electrical connection to the corresponding live Li, neutral Ni and earth El wires feeding into the boiler 2. The plug-in tester 1 can be kept in place (i.e. connected to the connector 0 of the boiler 2) throughout the period of time that, for example, maintenance is being carried out.
At this stage, if electricity flow from the mains supply 4 and, if applicable, electricity flow from the additional supply 6 has been stopped, i.e. no electricity is being supplied to the boiler 2, the plug-in tester 1 will be in a first state. In the first state of the plug-in tester 1, when there is no flow of electricity, there is no power being supplied to the plug-in tester 1. This means there is no flow of electricity through the first lamp 18 and the sounder 17, and the first lamp 18 will not be illuminated and the sounder 17 will not be producing a noise. Therefore, for example, when maintenance is being carried out, the operator knows that the electrical supply to the boiler 2 is dead when the first lamp 18 is not illuminated and/or the sounder 17 is not making a noise.
However, if there is a voltage across the boiler 2 then the plug-in tester 1 will be in a second state (i.e. power will be being supplied to the plug-in tester 1) and the first lamp 18 will be illuminated (e.g. an orange colour) and the sounder 17 will sound. This will immediately indicate, both visually and audibly, to the operator that current is flowing to the boiler 2 and it may be unsafe.
Once it has been established that there is no electrical current flowing to the boiler, the safety switch 16 can be flicked on. The safety switch 16 makes a short circuit between the live wire [4 and the neutral wire N4. If power comes back on (for example because someone inadvertently switches the mains supply back on), then the current will flow through this short circuit. This will then trip the circuit breaker and/or blow the fuse in the mains supply of the premises and protect the operator.
When electrical current is flowing to the boiler 2, the safety switch 16 is not on, and the plug-in tester 1 is in a second state, the phase rotation of the live [, neutral N and earth E connections can be checked using the plug-in tester 1. When the live and neutral connections are wired up correctly, the second lamp 19 will be illuminated (e.g. a green colour). If the second lamp 19 is illuminated then the phase rotation is correct and the electrical supply to the boiler 2 is connected as intended.
When the live and neutral connections are wired up incorrectly, e.g. they are reversed, then the third lamp 20 will be illuminated (e.g. a red colour). If the third lamp 20 is illuminated then the phase rotation is incorrect, there is a fault and there is potential danger to the operator or user. If this is the case, the operator can switch off the electrical supply once more and swap the live [and neutral N connections over before rechecking the phase rotation. If the second lamp 19 is subsequently illuminated then the operator knows the live L and neutral N connections are now correct.
The potentially dangerous problem of boilers 2 being wired up with two (or more) supplies and the additional supply 6 being live even when the boiler 2 is isolated from the mains supply 4 is alleviated by the current invention. By viewing, or listening to, the indicator on the plug-in tester 1 an operator can quickly determine whether there is a voltage across the boiler 2 and if it may be dangerous. The boiler 2 can be isolated from the electrical supply and the operator can check the electrical supply is dead before removing any covers to the PCB 8 etc. In addition, when the operator is working on the boiler 2, if the electrical supply is ever reconnected to the boiler 2, and the plug-in tester 1 is in place, there will be an instantaneous alarm, either visual or audible, from the plug-in tester 1 to make the operator aware that there is now a voltage across the boiler 2 once more. Also, if the safety switch 16 is on then the RCD can be tripped when current flows to the boiler 2 and the possibility of the operator receiving an electric shock can be avoided.

Claims (14)

  1. CLAIMS: 1. A plug-in tester for checking a status of an electrical supply to a boiler, the plug-in tester comprising: a housing; and an indicator on the housing; wherein the plug-in tester is removably connectable to a test connection on the boiler; wherein the plug-in tester includes means for making an electrical contact with live and neutral conductors carrying current to and from the boiler when the plug-in tester is connected to the test connection; and wherein the plug-in tester is configured to detect, and signal using the indicator, when power is being supplied to the boiler.
  2. 2. The plug-in tester according to claim 1, wherein the indicator is in electrical contact with the live and neutral conductors carrying current to and from the boiler.
  3. 3. The plug-in tester according to any preceding claim, wherein the indicator comprises a first indicator and a second indicator.
  4. 4. The plug-in tester according to claim 3, wherein the first indicator comprises a lamp and the second indicator comprises a sounder.
  5. 5. The plug-in tester according to claim any preceding claim, wherein the boiler is supplied with electrical power from at least one additional supply.
  6. 6. A plug-in tester for checking the phase rotation of an electrical supply to a boiler, the plug-in tester comprising: a housing; and an indicator on the housing; wherein the plug-in tester is removably connectable to a test connection on the boiler; wherein the plug-in tester includes means for making an electrical contact with live and neutral conductors carrying current to and from the boiler when the plug-in tester is connected to the test connection; and wherein the plug-in tester is configured to detect, and signal using the indicator, if the live and neutral conductors supplying current to and from the boiler are correctly wired.
  7. 7. The plug-in tester according to claim 6, wherein the indicator comprises a third indicator and a fourth indicator.
  8. 8. The plug-in tester according to claim 7, wherein the third indicator is in electrical contact with an earth conductor and the live conductor carrying current to the boiler.
  9. 9. The plug-in tester according to either of claims 7 or 8, wherein the fourth indicator is in electrical contact with an earth conductor and the neutral conductor carrying current from the boiler.
  10. 10. The plug-in tester according to any of claims 7 to 9, wherein the third and fourth indicators each comprise a lamp or a sounder.
  11. 11. A plug-in tester for tripping a circuit breaker, or blowing a fuse, of an electrical supply to a boiler, the plug-in tester comprising: a housing; an indicator on the housing; and a switch; wherein the plug-in tester is removably connectable to a test connection on the boiler; wherein the plug-in tester includes means for making an electrical contact with live and neutral conductors carrying current to and from the boiler when the plug-in tester is connected to the test connection; and wherein the switch is configured to make a connection between the live and neutral conductors for tripping the circuit breaker or blowing the fuse when current flows through the live conductor.
  12. 12. A method of checking a status of an electrical supply to a boiler using a plug-in tester, the method comprising: connecting the plug-in tester to a connection point on the boiler thereby making an electrical contact between the plug-in tester and live and neutral conductors carrying current to and from the boiler; detecting whether power is being supplied to the boiler; and indicating on a housing of the plug-in tester if power is being supplied to the boiler.
  13. 13. A method of checking the phase rotation of an electrical supply to a boiler using a plug-in tester, the method comprising: connecting the plug-in tester to a connection point on the boiler thereby making an electrical contact between the plug-in tester and live and neutral conductors carrying current to and from the boiler; detecting whether the live and neutral conductors supplying current to and from the boiler are correctly wired; and indicating on a housing of the plug-in tester if the live and neutral conductors supplying current to and from the boiler are correctly wired.
  14. 14. A method of tripping a circuit breaker or blowing a fuse of an electrical supply to a boiler using a plug-in tester, the method comprising: connecting the plug-in tester to a connection point on the boiler thereby making an electrical contact between the plug-in tester and live and neutral conductors carrying current to and from the boiler; and making an electrical connection between the live and neutral conductors in the plug in tester using a switch so that the circuit breaker will trip or the fuse will blow when current flows through the live conductor.
GB1417717.4A 2014-10-07 2014-10-07 Electrical test point for boiler Withdrawn GB2531017A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1417717.4A GB2531017A (en) 2014-10-07 2014-10-07 Electrical test point for boiler

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1417717.4A GB2531017A (en) 2014-10-07 2014-10-07 Electrical test point for boiler

Publications (2)

Publication Number Publication Date
GB201417717D0 GB201417717D0 (en) 2014-11-19
GB2531017A true GB2531017A (en) 2016-04-13

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
GB1417717.4A Withdrawn GB2531017A (en) 2014-10-07 2014-10-07 Electrical test point for boiler

Country Status (1)

Country Link
GB (1) GB2531017A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11467222B2 (en) * 2017-12-19 2022-10-11 Maanshan City Mingzhu Electronic Technology Company Limited Electrical apparatus and method for determining earth state of electrical apparatus

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3904958A (en) * 1974-07-17 1975-09-09 Hubbell Inc Harvey Circuit tester including information display means for testing electrical outlet receptacles
GB2344947A (en) * 1998-12-17 2000-06-21 Beha C Gmbh Test apparatus for power supply networks
EP1028361A1 (en) * 1999-02-03 2000-08-16 IABER S.p.A. Boiler remote control
DE20018612U1 (en) * 2000-10-02 2001-01-11 Schalk, Beatrice, Dipl.-Ing., 08485 Lengenfeld Test device for oil and gas burners on heat generators

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3904958A (en) * 1974-07-17 1975-09-09 Hubbell Inc Harvey Circuit tester including information display means for testing electrical outlet receptacles
GB2344947A (en) * 1998-12-17 2000-06-21 Beha C Gmbh Test apparatus for power supply networks
EP1028361A1 (en) * 1999-02-03 2000-08-16 IABER S.p.A. Boiler remote control
DE20018612U1 (en) * 2000-10-02 2001-01-11 Schalk, Beatrice, Dipl.-Ing., 08485 Lengenfeld Test device for oil and gas burners on heat generators

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Consolelectric Ltd, 2012, "Kenable UK Mains Power Plug 13A Socket Tester Polarity/Earth Checker", www.amazon.co.uk [online], Available from http://www.amazon.co.uk/kenable-Socket-Tester-Polarity-Checker/dp/B007JIRFYU/ref=sr_1_2?ie=UTF8&qid=1453982561&sr=8-2&keywords=tester+plug [Accessed 28-01-16] *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11467222B2 (en) * 2017-12-19 2022-10-11 Maanshan City Mingzhu Electronic Technology Company Limited Electrical apparatus and method for determining earth state of electrical apparatus

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