I asked the installation workers: how electric water heater is electrocuted? The installer is also a talkative person, put down the work in hand, give me science up - electric water heater has a total of three lines of defense, leakage current needs to break through all, in order to electrocute people.

The first line of defense: the leakage switch

When the water is really charged inside, a variety of anti-leakage devices will begin to work. The first line of defense, is the leakage switch.

Installation of electric water heaters in the circuit, there must be a leakage switch - this thing, installed in our home distribution box. When the leakage occurs, the leakage switch will be the first to trip and cut off the power.

Leakage can break through this line of defense, thanks to the user's usual carelessness. Open the distribution box and look carefully at the small print above each electric switch. There are several electric locks, there is a button written next to the "press once a month".

These electric switches, is the leakage switch. Leakage switch anti leakage function is easy to damage, so you need to test once a month, found damaged and timely replacement.

Have you not pressed this button for a long time? Do not hesitate to try it - press and trip, it is normal; press and no response, it is time to replace.

The second line of defense: the ground line

Electric water heater installation environment requirements, there is another, is the outlet must be properly placed ground. The ground is directly connected to the earth, when the leakage current appears, it will flow through the ground to the earth, thus avoiding human electrocution.

In the past, the installation requirements are not high, look almost to the installation. The last two years to install electric water heaters, the installer will use professional instruments (phasers) to measure to see if there is a ground.

But even if it is measured can not be 100% guaranteed safety, grounding body installed in the community next to the transformer. If there is no one to maintain, it will break down in a few years.

If you are not sure, you can buy a phase meter to test it yourself. Plugged directly into the socket, the display can directly show the line condition. This is a professional tool with a high accuracy rate and almost no error.

If there is no longer a ground at home, in addition to call the power department to report, remember not to plug in the bath again.

The third line of defense: water heater safety devices

When the safety devices in the line are failing, the safety devices inside the electric water heater comes into play. Common safety devices are: leakage plug, anti-electricity wall, water and electricity separation, etc..

But the safety devices are not absolutely stable, take the first two devices, for example.

Leakage socket, like the leakage switch, needs to be tested every once in a while. Long periods of time without testing, even if it is damaged we do not know.

Anti-electricity wall, the requirements for water quality is higher. The worse the water quality, the worse the anti-electricity wall's ability to prevent electricity. New neighborhoods may not have municipal tap water, old neighborhoods may have aging pipes on the water caused by secondary pollution - these, will be roughly anti-electricity wall failure.

Thus, the leakage current after the above-mentioned 5 steps, and finally break through all the blockade. With the water flow, contact our body, resulting in personnel electrocution. So in the use of electric water heaters in the process, "safety" this string must not be broken. Always remind yourself that you are using a potentially fatal product!