Inside the cold storage.

Gu Chen came to the machine, but he did not immediately go over to find out the situation. Instead, he turned around and asked the old worker next to him: "Does your machine have a grounding wire?"

"Yes, this is common sense in using electricity." The old worker also said sweetly: "When installing such a large machine, in order to prevent leakage, the installation master has already connected the ground wire and guided the leaked current.

Go underground."

"Then since there is a ground wire, how can we get an electric shock?" Gu Chen also wondered secretly, looking around at the machine.

Officer Wang followed closely and continued to ask the old worker: "How long have you been using this machine? Have you ever had any electric shocks before?"

"I have been using the machine for more than half a year, and it has always been very easy to use. Except for one part being damaged, there are basically no major problems."

"That's strange." Gu Chen held his chin in thought, then walked up to the old worker and asked, "But how did you judge that the boss's sister was electrocuted? How did you get her outside the cold storage?"

"I was just guessing about this." The old worker didn't mean to hide it and explained directly: "I entered the cold storage and found the boss's sister lying there. I didn't know what was going on at the time."

"But based on my feeling, lying next to the machine, there may be a possibility of electric shock. After all, I have a fellow worker in another factory who was also electrocuted, but he was lucky enough to save his life, so I think the boss's sister may have been electrocuted.

."

"Then what?" Gu Chen asked again.

"Then? Then I found a wooden chair, carefully moved her away from the machine, and then notified the boss."

Glancing at the machine in front of him, the old worker continued to add: "Later I found a digital display pen, and a lightning symbol appeared on the test pen, so this machine is live."

"So that's it?" After understanding the general situation, Gu Chen nodded silently.

Co-author: Was this woman electrocuted due to electrical leakage from the machine?

But was the electric shock accident that happened the day before yesterday an accident?

But these two people were acquaintances, not to mention that the boss of this company felt strange. If it were Gu Chen's own judgment, he would have the same idea.

The old worker looked at Gu Chen's thoughtful look and took a step forward to ask: "Comrade police, this machine has too much static electricity. Even if we connect the ground wire, it still doesn't work. There is still static electricity. What's going on?

What to do?"

"Then it's not static electricity, but electric leakage." Gu Chen took two steps back, keeping within a reasonable range of the machine, and said again:

"Static electricity will be released immediately when it touches the ground wire. Only leakage is continuous. You should check the machine and remove moisture."

"But..." After hearing what Gu Chen said, the boss suddenly came in from outside and said, "But if there is a power leakage, it should be there as soon as the machine is turned on. But we just tried to turn off the machine and turn it on again, and it took a few minutes for it to appear.

."

"How many minutes did it take for it to leak?" Gu Chen hesitated for a moment and then said, "Static electricity is present as soon as the phone is turned on."

"I don't understand this." The boss seemed very depressed. He looked at his sister's body and said with a sad face:

"I don't know exactly what happened. It took a few minutes for the power to leak. The digital pen we used had no display when we first turned it on. If we try again after a while, there will be a lightning symbol on the pen."

"So scary?" Lu Weiwei also shuddered when she heard this. She turned to look at Gu Chen and said, "If that's the case, what should we do?"

Gu Chen did not answer immediately, but continued to ask the old worker: "What kind of machine is this? Is the complexity high?"

"It shouldn't be high, right?" The old worker scratched the back of his head and said with a puzzled look on his face: "It's just an ordinary refrigeration equipment. This machine has only been used for half a year, so it can be considered an old brand. I asked many colleagues and they all said

There has never been any leakage problem.”

"Isn't the complexity factor high?" Gu Chen said thoughtfully, "Then I still suggest you find a knowledgeable master and check it in sections."

"First, disconnect the main circuit of the motor, and be sure to mark the order of the lines to prevent the motor from reversing during recovery."

"Also, turn on the power switch on the machine and see if the machine casing is charged?"

"If there is, then there is no problem with the motor and the problem lies in the power switch part."

"In addition, it is recommended to press the buttons one by one, and so on."

"Well!"

Listening to Gu Chen's serious suggestion, the old worker said, "Comrade policeman, did you work as an electrician before?"

"No, I just know a little bit about it," Gu Chen said.

At this moment, there was a roar outside the cold storage.

Upon hearing this, the boss quickly walked to the door. After a brief exchange, he came forward with a man in blue work clothes: "Comrade police, this is a knowledgeable master I borrowed from the factory next door.

He should be familiar with this."

"Then let him come over and take a look." Gu Chen said.

The boss said "Oh" and quickly asked the master to come over.

The middle-aged master seemed to be very cautious. He walked to the machine and after repeatedly asking about the specific conditions of the machine, he began to open the tool box and prepare to test the equipment.

While the machine was being turned on and off for testing, Gu Chen asked Officer Wang to stay at the scene while he took Lu Weiwei to the body outside the cold storage to conduct another test on the body.

A few minutes later, Gu Chen frowned slightly: "The deceased's skin color was light yellow, but there was no inflammatory reaction?"

Since the light outside the refrigerator was not good, Gu Chen took out a miniature flashlight and gently opened the deceased's eyelids for inspection.

At this time, there was some conversation at the cold storage. Gu Chen simply took back the flashlight and went to the cold storage with Lu Weiwei again to understand the situation.

The knowledgeable master put the tools aside and explained to everyone: "I just checked and there is still a ground wire, but it is much smaller. At least there is no pain in the electric one."

Lu Weiwei frowned slightly and said: "If you feel pain, then the possibility of electric leakage is very high."

"Yes." The knowledgeable master nodded slightly and added, "If the venue is wet, then it doesn't matter. Use a hair dryer to heat those terminals and make sure not to leak any of them."

"Use a hair dryer to heat those terminals? Don't miss any of them? What is the process? Brother, please explain in detail."

The old workers didn't seem to understand much, and they were confused.

Gu Chen was the first to explain: "What this master means is... to remove moisture and reduce the chance of leakage. If there is any dirt, you can use a toothbrush to brush it off."

"Hey? Comrade police officers also know this?" Gu Chen's answer still made the old master stunned for a moment.

Gu Chen smiled slightly but said nothing.

The old worker on the side couldn't help but said: "But... our stuff is very dry, dirty, but a bit dusty."

"Is it very dry?" The old master was stunned, and then said: "Then it really may be static electricity. Could it be that the problem still occurs in the ground wire? But it seems that there are only three incoming wires just now. Do we need to make a new ground wire?

ah?"

The boss couldn't help but curiously asked him: "Are the ground wire and neutral wire the same thing?"

"No, no." Seeing that the boss didn't understand his skills, the master quickly explained: "This is not the same thing. The ground wire is specially used for protection. Under normal circumstances, there is no current."

"But the neutral wire is the working wire, and there will be working current flowing through it."

"You need to check how many incoming wires there are in your room. There should be at least 4 wires, preferably 5 wires. 5 wires will be easy to handle."

"Well, we seem to have 4 incoming lines, and we connected 3 at that time."

"Hmm." After hearing what the old worker said, the old master was silent for a few seconds and then said: "I took a look at your machine, but I don't understand it very well. You'd better use a neon tube pen to see if it lights up."

"I have used it. The digital display pen I used has no display when I first turn it on. If I try again after a while, there will be a lightning symbol on the pen." said the old worker.

"That's it." The old master seemed to have a headache, scratching the back of his head and asking, "How do you connect the ground wire?"

"Just... maybe the other end was connected to the heating pipe, and an iron rod was made on the ground to connect it," said the old worker.

The old master nodded slightly and added: "On the land outside, dig a 1.5-meter-long gold-plated iron pipe or angle iron, drive it into the ground about 1.4 meters, and connect the wiring to the metal parts of the machine."

"It seems like this." The boss also had some impressions, and added: "It was done like this when it was installed. I remember that driving a small nail into the ground was useless. It must be connected to the wet soil layer outside."

"How deep?" Gu Chen asked him.

"The wet soil is only half a meter," the boss said.

Gu Chen shook his head: "At least 1 meter deep."

The boss hesitated for a while and then changed his words: "It seems there is, I don't remember exactly. Anyway, the installer is a professional, he should know this."

"And this equipment has been used for more than half a year, and there are generally no problems."

"Are you connected to the land outside?" the old master asked.

The boss nodded slightly.

The master suddenly fell into deep thought and felt that there was no problem. It was probably that there was something wrong with some operation of the machine equipment.

But I couldn't explain it for a while, so I could only give up and say: "I'm really sorry, maybe I'm not familiar with this kind of machine. You'd better ask the manufacturer to come and take a look. If there is really a problem, you have to ask them to compensate for the electrocution."

Seeing Gu Chen still staring at the machine thoughtfully, when the old master passed by Gu Chen, he also casually asked: "Comrade police, what do you think?"

"Two possibilities." Gu Chen crossed his arms, thoughtfully.

The old master was stunned for a moment: "Two...two possibilities? What do you mean?"

Gu Chen thought for a few seconds and then said again: "Either the machine casing and the terminal are disconnected. For the ground wire to work, the metal part of the machine casing must be well connected to the equipment ground terminal."

"But... how do you judge this?" The master hesitated for a moment, and could only tentatively ask Gu Chen for advice.

Gu Chen said calmly: "Actually, the judgment method is also very simple. You can use a multimeter to measure whether the metal shell of the equipment is connected to the terminals of the equipment."

"This... seems okay." After hearing what Gu Chen said, the old master seemed to be inspired and nodded silently, feeling that this little policeman knew a lot.

So he asked again: "What is another possibility?"
To be continued...