How to do Polarity Test |How to check polarity in electrical system| Polarity test |Learn Electrical
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- čas přidán 12. 09. 2024
- How to do Polarity Test |How to check polarity in electrical system| Polarity test |Learn Electrical
Polarity test definition”
In the context of electricity installations, a polarity test is used to confirm the correct connection of the line and neutral conductors. For example, for an Edison-screw lamp holder, it is important that the line conductor is connected to the centre terminal and the neutral conductor is connected to the outer conductor. Similarly, it’s important to confirm that switches are located in the line conductor not the neutral conductor.
Why do a Polarity Test?
The purpose of a polarity test to ensure that all single pole devices (fuses, switches and circuit breakers) are connected in the phase conductor only. We cannot simply trust that the electricians have connected things up the right way; everyone makes mistakes, even if it’s your own work. Since ac installations consist of a Live and a Neutral conductor, it is extremely important that these conductors are connected the right way around, within all electrical accessories such as wall sockets or plugs. To ensure this, polarity test is done at each relevant point. This simple test is just as important as all the others, and many serious injuries and electrocutions could have been prevented if only polarity checks had been carried out.
There are 4 different scenarios that require a polarity test, these are:
1. All single pole devices (fuses, switches and circuit breakers) are connected in the phase conductor only.
2. The phase conductor must be connected to the centre terminal of an Edison screw lamp holder (with the exception of E14 & E27 lamp holders, these are European and occasionally crop up in the exam).
3. All polarities of socket outlets (ring & radial) must be verified.
4. The polarity of the mains supply must be correct, using an approved voltage tester. (This is done with the supply connected, therefore carried out at a different stage then the above three)
Method 1 for Polarity Test
This method is exactly the same as test method one for ‘Continuity Of Protective Conductors’ if we take a lighting circuit, by putting a temporary link between phase and circuit protective conductors (cpc), at the consumers unit and our instrument at lamp holders themselves, we are creating a circuit. When we operate the light switch, the instrument changes, and then changes back to the original reading on operation of the switch again. If the reading did not change, then the switch is likely to be connected in the Neutral. (Not good!) With a little foresight this could be carried out at the same time as the continuity test. The only difference being, for radial circuits every point must be tested. The main benefit with this is it allows you to conduct 2 tests at the same time, polarity and R1 + R2.
Method 2 for Polarity Test
Steps:
1. Test between LINE and NEUTRAL terminals.
2. Test between LINE and EARTH terminals.
3. Test between NEUTRAL and EARTH terminals.
The test instrument should indicate full voltage (230V) between Line-Neutral and Line-Earth conductors. No voltage should be detected between Neutral-Earth..
How to do Polarity Test,How to check polarity in electrical system,Polarity test,Learn electrical,Polarity test for DB,how to check polarity,Electrical test,Polarity VS Continuity,continuity test and polarity
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#PolarityTest #TestPolarity #LearnElectrcial
Nice videos good informition
Very informative..
Thanks sir.
v informative
Very important video.
How it is R1 while your Selected cable is yellow
Very nice video
Nice video
Very nice
hmmmm good concept
perfect...