How to find out the grounding wire with the same color of three wires when decorating the home, plea

Buy a pen and try it.

The first thing to measure with an electric pen is the live wire.

Distinguish between the neutral ground wire:

The specific method is: after the power on, first of all, the multimeter is zeroed, after the zero adjustment is completed, you can measure, use the black pen to insert the jack of the live wire, and then use the red pen to insert the other two jacks, we look at the value measured by the multimeter, if the value measured twice is about 220, then the high value is the zero line, and the low value is the ground wire.

Precautions for hydropower installation:

1. When designing the waterway, you should first think about all the equipment related to water, such as water heaters, water purifiers, washing machines, toilets and wash basins, etc., and think about the installation location, method and whether you need hot water.

2. In addition to the water outlets such as wash basins, cloth pools, and clothes machines, it is best to install a faucet in the bathroom to facilitate the connection of water and flushing the ground in the future.

3. It is best to have the property present when conducting the suppression test, so as to play a supervisory role and avoid some decoration teams from deceiving the owners. The method of pressure is to open the "return valve" of the pressure pump to form a circuit to see if there is pressure in the tube, especially for the electric pressure pump, we should pay more attention.

4. After the waterway is installed, it is necessary to pay attention to check whether the waterway in each place is kept unblocked, such as: whether each drain outlet of the faucet such as kitchen, bathroom, balcony is unobstructed. If you find that the drainage is slow or poor, you should get the property unblocked in time.

There are two steps to distinguish:

1. Three wires of the same color are separated and energized. Use a test pen to separate two or three wires, and the one that lights up is the live wire;

2. For low-power lighting (such as 25W table lamp), connect the live wire to either end of the two-phase plug in the state of power failure, and connect the other end to one of the two wires that need to be measured. On power, if it trips, that is the wire that needs to be measured for the plug is the protective grounding wire. If it does not trip, then the wire that needs to be measured for the plug is neutral.

Finally, three wires are connected to single-phase three-pin sockets: the live wire is connected to the hole on the right, the left is connected to the neutral wire, and the upper side is connected to the protective grounding wire.

First of all, use an electric pen to measure the bright one is the live wire, according to the order of the left zero and right fire to connect the live wire, the other two wires are connected casually, and then use the socket wiring electroscope (a lot of treasure, the effect is great) detection, and according to the test results to connect the zero line and the bottom line.

On the plug, the top one is the ground wire, which is the top one of the triangle. The distinction between the live wire and the neutral wire is related to the wiring of the socket, according to the standard of the electrician, remove the top point, and the remaining two points. On the left is the zero line, and on the right is the live line.