We have written a complete article on electrification and electrocution, which makes it possible to define these two terms and the dangers involved.

Disconnect the electrical installation:

Before talking about VAT, there is a gesture that must be mechanical, it is the power supply cutoff: It is necessary to separate the electrical installation, it is the word used in electrical authorization. Simply turn off the power at the branch circuit breaker, to ensure that no part of the installation is powered. For the Software Engineering in New Zealand this is important.

But that's not all, since it is then necessary to proceed to the verification of absence of tension to be certain that the separation is well carried out:

Two precautions are better than one: The VAT or verification of absence of tension

You have separated at the branch circuit breaker? Are you convinced that no current is coming to the place where you will work?

To be clear, we invite you to proceed to a Verification of Absence of Voltage or VAT. For this, the device used is a voltage-free tester:

To make a check of absence of tension, it is necessary to use a specific apparatus.
This device is used to test whether or not there is voltage on the terminals of the device concerned.

Yes but be careful before using it, who tells you that it works well?

It must therefore be tested before making the measurement. Some verifiers have a "self test" button, for others, just touch the two connectors of the device together (light or sound signal to indicate the proper operation). If the device does not beep, it is not working. Regarding the Software Engineering in New Zealand this is essential.
You have to do the test on where you will work. If the tester tells you that there is voltage (light or sound), you do not have to cut the breaker, or you have another power source in the house! If there is no signal, it is probably that there is no voltage. Why probably? because it may well be that your device has broken down when you take the measurement.

About the Company: Real Data started as a Software Engineering company we specialized in database and.NET software development. Most of our projects are based around reading data from third party gear and store the values into tables in a database we then develop a.NET graphical interface to retrieve the data from the database and output it into a report.