Attach great importance to the electrical safety d

Attach great importance to the electrical safety design of residential toilets

Abstract: This paper analyzes several aspects of the electrical safety design of residential toilets, and explains that we should pay attention to the electrical safety of toilets from the design

key words: residential toilet electrical safety leakage protection equipotential connection Untitled Document with the development of the national economy, the design standard of residential buildings has been improved accordingly. As a major of architectural electrical design, in addition to meeting the ever-changing power needs of residents, it is based on the principle of people-oriented, Residential electrical safety has become an important topic, which puts forward the control advantages of tension testing machine in the field of building electrical design. Among them, the electrical safety of residential toilets is particularly prominent because of the particularity of their environment. Now the residential bathroom is no longer just a place for washing and rinsing with a single function. It has increasingly become a place for people to relax, relieve fatigue and enjoy life. Therefore, the design of the toilet should be beautiful, comfortable and practical as much as possible. However, in real life, people often ignore the electrical safety of toilets and do not correctly set the electrical safety facilities of residential buildings according to the standards. In fact, as a special place of residence, the bathroom is a dangerous place for electric shock. When a person takes a bath, his skin is wet and barefoot, and his impedance drops sharply. A contact voltage lower than the contact voltage limit of 50V can produce excessive human body current and cause death and injury. This shows the importance of electrical safety design of residential toilets. The electrical safety of residential toilets is mainly reflected in the following aspects:

first, leakage protection:

residential toilets are generally equipped with bathing equipment, which belongs to a severely humid place. Article 14.3.10 (3) of jgj/t code for electrical design of civil buildings (hereinafter referred to as "Civil Code") stipulates: "electrical equipment in particularly harsh or humid places (such as boiler rooms, canteens, basements and bathrooms) should be equipped with leakage current action protection." At the same time, according to paragraphs 3 and 4 of 6.5.2 of GB code for design of residential buildings (hereinafter referred to as "housing regulations"): "the power sockets in residential toilets should be equipped with leakage protection devices." In the design, the power sockets in residential toilets adopt leakage protection devices with a leakage action current of 30mA. What is the basis? Article 5.6.2 of GB "installation and operation of leakage protectors" (hereinafter referred to as "leakage regulations") stipulates: "electrical equipment installed in wet places should choose leakage protectors with rated leakage action current of 15~30ma and fast action." Paragraph (1) of article 14.8.2.9 of the civil code also stipulates that "the installation of sockets in zone 3 must meet the following conditions before it is allowed: C. It is powered by the power supply line with leakage protection measures, and its action current should not exceed 30mA." (please refer to the third part of this article for the meaning of the so-called "zone 3"). Therefore, the action current of the leakage current protection device for the power socket in the residential toilet can be set as 30mA

however, paragraph (2) of article 14.3.11 of the Civil Code stipulates: "the operating current of the leakage current protection device for electrical equipment in harsh or humid places is 6~10ma." This should be understood as the following: in the design of senior residences and villas, the master bathroom often selects the jacuzzi. At this time, according to the requirements of page 116 of 99s304 "sanitary equipment installation", a power supply circuit with a leakage action current of 6mA should be provided for the circulating water pump under the Jacuzzi basin. (i.e. class a GFCI protection)

II. Equipotential connection:

paragraph 6 of article 6.5.2 of the Housing Code stipulates: "toilets equipped with bathing equipment should be locally equipotential connected." At the same time, article 14.8.2.2 of the Civil Code stipulates: "auxiliary equipotential bonding must connect the conductive parts outside all devices in Zones 0, 1, 2 and 3 with the protective wire of the exposed conductive parts in these zones, and connect with the grounding device through the main grounding terminal." In the design, according to the national standard atlas 02D "equipotential connection installation", often only the connection between LEB terminal and toilet socket PE line is paid attention to. In fact, the connection of PE line of toilet wall lamp and ceiling lamp should also be added

wall lamps are generally set above the washroom basin, and their installation height is 1.8m~2.0m. According to article 19.1.6 of GB code for acceptance of construction quality of building electrical engineering, "when the height of the lamp from the ground is less than 2.4m, the accessible bare conductor of the lamp must be reliably grounded (PE) or neutral (pen), and there should be special grounding bolts with marks." Therefore, the bathroom wall lamp must be connected to PE line, and the design can basically meet this requirement. However, some designs ignore the ceiling lamp in the bathroom. Although the ceiling lamp is ceiling mounted in our design, users often use the ceiling in the bathroom during secondary decoration. At this time, the ceiling lamp (or Yuba) is embedded into the ceiling for installation, and its height is often less than 2.4m. Obviously, the ceiling lamp should also be connected to PE line in design

in the design, there are three ways to introduce the PE line of the wall lamp and ceiling lamp in the bathroom: one is through the lighting circuit of the indoor small switch box using bv (3x2.5), the other is from the PE line of the socket in the bathroom, and the third is from the LEB terminal set in the bathroom

but in the first method, it is uneconomical to configure PE lines specifically for toilets. In the second method, the research has won the strategic leading science and technology project of the Chinese Academy of Sciences (category B), the innovative group of "inorganic organic hybrid functional materials" of the national foundation of science, the National Fund for Distinguished Young Scholars, the youth project of the National Natural Science Foundation The funding methods of the general project of Fujian Provincial Natural Science Foundation and the outstanding youth project of the State Key Laboratory of Structural Chemistry (Gu Zhigang) are affected by the huge space for the future development of the construction, the quality of work and the change of socket location during the secondary decoration of residents, which may cause that the actual PE line is not really connected. I think the third way is the best

02d in page 16 of equipotential connection installation, all LEB wires are bvr-1x4mm2 conductors, which are concealed in plastic pipes in the ground or wall. In fact, the LEB line can also be concealed by bvr-1x2.5mm2 conductor through plastic pipe. Table 1 on page 5 of 02D provides the selection criteria of equipotential bonding wire section, in which the local equipotential bonding wire is described as follows: the general value is not less than 0.5xpe wire section, and the minimum value is 2.5mm2 copper wire with mechanical protection

installation of lines, switches and control equipment in zones 3, 0, 1 and 2: