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What kind of electric griddle grill is safe

What kind of electric griddle grill is safe

What kind of electric griddle grill is safe

In daily life, the production methods of staple food are nothing more than steaming, frying, boiling, roasting, and roasting. The "roasting" is not only in the catering industry, but also in the food processing industry. Grills must be used for grilling food. Charcoal grills have almost disappeared. At present, in addition to gas grills and oil grills, electric griddle grills are currently used in restaurant kitchens and food factories. Compared with other grills, the electric griddle grill does not pollute the environment, is easy to install and use, and improves the working conditions of the operators, so it is very popular. But as an electrical product, if the electric griddle grill is improperly purchased, installed, or used, it will turn into an electric tiger, which may endanger personal and property safety. In recent years, vicious accidents such as electric shocks and fires caused by electric griddle grill have occurred from time to time.

       my country has implemented a production license system for food electric griddle grill since the 1980s. In 1997, it promulgated and implemented new product safety standards, and conducted national supervision and spot checks on food electric griddle grill many times to improve product quality and protect The safety of people's lives and property. In the second quarter of 2003, the General Administration of Quality Supervision, Inspection and Quarantine again organized national supervision and spot checks on food electric griddle grills. The overall product pass rate was only over 60%. The safety situation of food electric griddle grills is still not optimistic.

What kind of electric griddle grill is safe? According to some important regulations of the national standard, combined with the quality problems we found in the national supervision and random inspections and product safety accident analysis over the years, a brief introduction to the main safety requirements of electric griddle grill is given.

Protection against electric shock

      The protection against electric shock is also called "protection against touching live parts". According to this requirement, all live parts on the product should be closed and covered with shells, covers, covers or insulating materials, and these protective shells should not be opened or removed without the use of tools to prevent users from Electric griddle grill accidentally touches live parts when operating, moving or maintaining the electric griddle grill.

During the inspection, it was found that in order to save labor and materials, some factories used baffles to cover the exposed live parts such as the ends of the electric heating tubes of the ovens, but they were invisible to the eyes. You can still use your fingers from the lower part of the baffle or through the gaps and holes. Touch the live parts; some of the electrical box doors are designed to be easily opened for future maintenance and replacement of parts by the manufacturer, and the temperature controller and other electrical components on the panel can be removed with bare hands, so that the live parts are exposed and lose protection; some products are used The bare heating wire is used as a heating element, but no protective measures have been taken. The owners of these factories subjectively think that users know which parts of the electric griddle grill are powered and will not touch them. This is a fluke of wishful thinking. Such a product's anti-shock protection project does not meet the qualification requirements, and will bring serious unsafe risks to users and users.

Insulation resistance, leakage current and electrical insulation strength

For the requirements of preventing personal electric shock, it is obviously not enough that the product only has the protection measures to ensure that people cannot touch the live parts. The product should also ensure that the electrical insulation between all surfaces of the electric griddle grill that people can reach and the live parts inside is safe and reliable. , Otherwise it may still be dangerous if people touch the non-live shell of the oven. To check whether the electrical insulation meets the requirements, generally use three indicators of insulation resistance, leakage current and electrical insulation strength. Because the instrument used to measure insulation resistance (commonly known as "shaking meter") is cheap and easy to use, in electric griddle grill manufacturers, the method of measuring insulation resistance is widely used to judge the electrical insulation quality of the product, which is also a normal check for users A simple and practical method to check whether the electrical insulation of the oven is damaged. However, it is stipulated in the GB4706 series of national mandatory safety standards that the leakage current and electrical insulation strength are used as the basis for determining the electrical insulation quality of the electric griddle grill.
Leakage current: When any electrical product is in use, if a person standing on the ground touches the ungrounded shell of the product, current will flow through the human body. This current is called leakage current. Under normal circumstances, the leakage current of electrical products is very small, and people will not feel it. However, when the insulating medium is damp or high temperature causes performance degradation, the leakage current may exceed the safe value and personal electric shock may occur. In order to prevent this danger, it is necessary to use special equipment to simulate the human body and environmental conditions to test the leakage current of the product to confirm that it does not exceed the specified limit.
Electrical insulation strength: also known as electrical strength or dielectric strength, commonly known as high voltage resistance. The power supply voltage of my country's mains is 220V single-phase and 380V three-phase. However, due to inductive loads and other reasons, the power grid may instantaneously generate overvoltages much higher than the supply voltage under certain conditions, which requires electrical insulation of products. Certain ability to withstand overvoltage. The ability of electrical insulation to withstand breakdown voltage is called electrical insulation strength, which is a very important indicator for assessing the safety and quality of electrical insulation. The test method is to use a special high-voltage tester to apply a higher test voltage between the live parts of the electric griddle grill and the shell, and keep it for a certain period of time to observe whether the insulation breakdown or flashover occurs. According to different insulation properties, the test voltage value is generally 1000V to 3750V.
The electric griddle grill is left for a long time without causing the insulation to be damp, or the insulation is overheated by long-term high temperature continuous use, which are the two extreme states that are most likely to reduce the electrical insulation performance and cause leakage and breakdown accidents. Therefore, the leakage current and electrical insulation strength tests must be carried out separately under conditions that simulate the two worst conditions. Generally, the test that simulates the wet state is called the cold state or the wet state; the test that simulates the overheating state is called the hot state or the working temperature. All electrical insulation of the product should be able to withstand all the required cold and hot tests before it is considered qualified.
The insulation of the food electric griddle grill heating tube is the weakest link in the electrical insulation of the entire product, and leakage and breakdown often occur in these parts. In addition, the use of low-quality thermostats, switches, and wires, the use of insulation materials with poor heat resistance, and the use of hygroscopic asbestos and silicate cotton for electrical insulation, etc., all cause the product to leak current and electrical in the hot or cold state. The insulation strength is not up to the qualified requirements, and is even an important cause of personal safety accidents. Strictly controlling the procurement of safety-related electrical components, and doing a good job of the purchase inspection of key components such as electric heating tubes, is an important part of greatly improving the safety and quality of electric griddle grill.
Grounding measures
      For food electric griddle grill, the so-called grounding measure is to install a grounding electrode (grounding bolt) on the main body of the metal shell of the product, and then connect all other exposed metal parts that are not connected to the main body that can be touched by hand, if possible, all Use a wire to reliably connect to the grounding electrode; the power cord must have a yellow and green protective grounding wire. The inner end of this wire is reliably connected to the grounding electrode on the metal shell body, and the outer end is connected to the grounding electrode of the power plug; For ovens with plugs, connect the protective ground wire of the power supply during installation. Electric griddle grill with reliable grounding of the metal shell, in the case of insulation failure and dangerous voltage on the shell, since the oven shell is equal to the ground potential (the potential difference is equal to zero, there is no voltage), stand on the ground and touch the metal shell of the oven The person does not cause any danger.
It can be seen that the electrical insulation and grounding of the electric griddle grill constitute a double protective measure to prevent personal electric shock. Double protection is an important safety principle in the GB 4706 national standard. It runs through the standard clauses and greatly improves the safety of food electric griddle grill, which has important practical significance.
In addition, we can also say that grounding measures are the last protective barrier to prevent electric shock. In all accidents of electric shock and death, almost 100% of the product metal shells are not reliably grounded. There are three reasons: one is that the product does not have a grounding electrode and a protective ground wire that meet the requirements; the other is that the grounding measures of the product meet the requirements, but the protective grounding wire of the power supply is not connected during the site installation; the third is that the power system at the product installation site does not have a protective ground ,unable to connect. The key to solving the first and second points is that the producers and users of the products must truly understand that grounding is a matter of life and death, and must strictly implement the standards without being careless. The third point involves the matching of the design and installation standards of the electrical system of civil buildings with the standards of electrical griddle grill and other electrical products, which is more complicated. But what is certain is that the ungrounded electric griddle grill must not be used.
Abnormal work
Abnormal work is a very important set of safety items for the food electric griddle grill. It assesses whether the product can still guarantee the personal and property safety of the user and the user under the abnormal situation of human misoperation or some kind of malfunction during the use of the product. , No catastrophic accidents such as electric shock and fire will occur.
Abnormal work is relative to normal work. For example, the electric griddle grill is generally equipped with a temperature control system that automatically turns on and off the heating element to control the baking temperature of the food when the oven is in a normal working state. Once the temperature control system fails and cannot automatically cut off the heating power, the oven will be in an abnormal working state, the heating will be out of control, and the temperature inside and outside the oven will rise unrestrictedly, which will eventually cause the oven to burn out or even catch fire. There are also some ovens with manual temperature control function. According to the operating regulations, the operator must not leave when using manual temperature control. However, the operator may misoperation due to negligence, which will also cause abnormal working conditions of heating out of control. This requires the oven to install a set of overheating protection system independent of the temperature control system, and quickly cut off the heating power in the case of temperature control failure to prevent catastrophic accidents.
Electric griddle grill must ensure the safety of people and the environment under normal working conditions, and ensure the safety of people and the environment under abnormal working conditions. This is another important safety principle of the GB 4706 series of standards, which has extremely important practical significance for improving the safety and quality of electric griddle grill.
       The realization of abnormal work safety protection will definitely increase product costs. Those inferior products that rely on low prices to compete in the market cannot be installed with overheating protection systems, and some factories use inferior parts to show off, which simply cannot achieve the purpose of overheating protection. All these food electric griddle grills that do not have the function of overheating protection are substandard products that do not meet the national mandatory standards and pose serious safety risks. Consumers should not buy them cheaply. In the event of an accident using such unqualified products, causing losses, the law shall be applied to protect their legitimate rights and interests.

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