What is r1 r2 electrical testing
R1 and R2 what does it mean
Jun 30, · Hi. If you are R1+R2 testing on a radial circuit then you simply isolate all power at the DB i.e main switch off, place a link between Line and Earth of the circuit you want to test, then go to the end of that circuit and measure the continuity between Line and Earth. R2 TESTING GUIDELINE vFinal 28/06/ Page 7 of 38 1 Purpose of Guideline This R2 1 Testing Guideline has been developed to provide guidance for preparing testing programs intended to derive R2 models and data. Model validation processes for wind and other variable generation technologies is a relatively new topic which merits clarification.
The aim of this article is to explain why it is necessary to determine the value of earth fault loop impedance, and considers the different options available for the contractor when needing to obtain the measured value for a typical lighting circuit. Note that this article particularly applies when performing periodic inspection and test how to tile a splashback for a sink older installations which pre-date recent editions of BS In order for the protective device to operate within the maximum permitted time of Table This article will discuss the loop impedance testing of a lighting circuit only.
Obtaining the value of earth fault loop impedance for a lighting circuit can be determined by one of the following options:. Although it may be more practical to take a direct measurement option 2 on circuits such as the ring final circuit, carrying out such a test on a lighting circuit for example may not be generally suitable as it involves uneccessarily working on or near exposed live parts.
It is recognised that luminaire plug-in adaptors are available which facilitate a safe and reliable connection to live terminals during a test. However, the use of such adaptors what time does panera bread open and close become irrelevant when a connection to earth is required, usually within the luminaire.
How to injection mold plastic at home removal of covers for access to the earth terminal may inherently expose persons to live parts. To conform to Regulation 14 of the Electricity at Work Regulationsunnecessary work carried out on or near live conductors should be avoided wherever possible.
Regulation Measurement of Z e Regulation Such a test verifies the presence of a means of earthing and provides the ohmic value of this which is expected to lie within the parameters for the intended earthing arrangement. This process will however, involve working on or near live parts at the origin of the installation, in which all necessary precautions must be taken to prevent danger. Before carrying out the test, the installation must be totally isolated from the supply, and the means of earthing disconnected from all other protective bonding conductors within the installation.
Guidance on an appropriate safe isolation procedure is outlined in the Electrical Safety First publication Best Practice Guide 2. The test what is square root of typically carried out using a two-lead, as shown in Fig 1, or three-lead earth fault loop impedance test what is r1 r2 electrical testing, although the testing procedure may vary depending upon the instruments, manufacturer.
On completion of testing and before the installation is re-energised, the earthing conductor or other protective conductors that were previously disconnected to facilitate the measurement of Ze must be reconnected. Such a test is carried out between the circuit protective conductor and the associated line conductor and measures the series resistance of both conductors for the circuit under test.
Having temporarily connected together the line conductor and circuit protective conductor at the consumer unit, the instrument test leads can be connected to the terminals of the line conductor and the circuit protective conductor at the accessory. It should be noted that the resistance of the test leads will be significant, therefore for maintaining accurate results, it will be necessary either to record the resistance of the test leads for subtraction from the overall measurement or use the auto-null function, where permitted, on the test instrument prior to carrying out the testing.
However, where the lighting circuit is supplied from an additional sub-board located at a distance away from the origin, an allowance must be made for the impedance of the sub-mains cable, as shown below:.
For overcurrent protective devices not covered by those Tables, further information relating to the limiting values of Zs must be obtained from the device manufacturer. Although the Zs values in Table While it is a requirement to determine the earth fault loop impedance for every circuit within an installation, determining such a value for a lighting circuit should be obtained through other means than taking a direct measurement, thereby reducing any unnecessary contact with live terminals.
To comply with Regulation 14 of the Electricity at Work Regulationsunnecessary work carried out on or near a live conductor should be avoided where ever possible. For more technical advice click here. The test is typically carried out using a two-lead, as shown in Fig 1, or three-lead earth fault loop impedance test instrument, although the testing procedure may vary depending upon the instruments, manufacturer, On completion of testing and before the installation is re-energised, the earthing conductor or other protective conductors that were previously disconnected to facilitate the measurement of Ze must be reconnected.
Summary While what is r1 r2 electrical testing is a requirement to determine the earth fault loop impedance for every circuit within an installation, determining such a value for a lighting circuit should be obtained through other means than taking a direct measurement, thereby reducing any unnecessary contact with live terminals. Made 2 Measure: is there a tester that can identify live cables and cable breaks? Megger 3 April, Made 2 Measure: do you need a new two-pole tester?
Megger 13 March, Made 2 Measure: how do you deal with harmonics? Megger 29 January, All Rights reserved.
Testing protective conductors
Mar 01, · Under the test schedule (page 78) R1+R2 TEST is not required (table ) but continuity of protective conductors testing IS therefore zs-ze will satisfy this in my opinion. The most important thing is to ensure is that the Ze is pure when it is tested (ie checks suppliers path integrity). (R1+R2) – Sum of the resistance of Line and Earth for the tested circuit. Where Ze is derived from a high current test and R1 + R2 obtained during continuity testing of the circuits. The type of test results recorded and the test method used will be indicated in the . Sep 01, · A measurement of R1 + R2 is mainly used to prove continuity of protective conductors. However the readings you get from this test can be used to calculate the Earth Fault Loop Impedance (Zs) by adding it to Ze. Zs = Ze + (R1 + R2) The maximum Zs values are found on pages 48 - 50 of BS (Tables , , and ).
Discussion in ' Electrics UK ' started by sanj. If you need to find a tradesperson to get your job done, please try our local search below, or if you are doing it yourself you can find suppliers local to you. Log in or Sign up. DIYnot Forums. Can someone who knows tell me what R1 and R2 on a minor works cert mean?
I understand the Z's and most of the other items but not R1, R2 and in some cases R3? I think R3 is a typo? R1 is the circuit phase conductor resistance R2 is the circuit earth conductor resistance. Spark , 2 Apr I've never seen R1,R2 quoted on a minor works cert. DESL , 2 Apr Not heard of R3. Yup, it's a typing error. RF Lighting , 2 Apr I might put them in the hall of shame!
Im saying nothing. Joined: 3 Sep Country:. Select the supplier or trade you require, enter your location to begin your search.
Please select a service and enter a location to continue You must log in or sign up to reply here. Show Ignored Content. Related Threads.
What does this instruction on my thermostat back plate mean? Replies: 4 Views: What does this symbol mean? Replies: 11 Views: 1, John D v2. What does the term "Compounded RCDs mean? Replies: 30 Views: 2, Replies: 27 Views: 6, Replies: 8 Views: 3, Lighting: What does dual insulated mean? Replies: 3 Views: Share This Page Tweet. Your name or email address: Do you already have an account? No, create an account now.
Yes, my password is: Forgot your password?
<- What is the statement of cash flow - What are the different decision making models->