JB/T 8593-1997 Panels, adjustment plates and mounting boxes for concealed installation of electrical accessories
Some standard content:
Machinery Industry Standard of the People's Republic of China
JB/T8593—1997
Faceplates, adjustment plates and installation boxes for concealed installation of electrical accessories. Quality classification and grading of surface protective layers of mechanical products. 1997-0725. Issued.
Ministry of Machinery Industry of the People's Republic of China.
Implementation on 1997-10-01.
Faceplates, adjustment plates and installation boxes for concealed installation of electrical accessories. JB/T8593—1997
JB/T8595—1997. Quality classification and grading of surface protective layers of mechanical products. (1)
JB/T8593—1997
This standard is formulated based on the non-equivalent IEC670 (1989) "General requirements for enclosures of accessories for household and similar fixed electrical installations" (hereinafter referred to as IEC670).
This standard is basically the same as IEC670 in terms of safety performance requirements; in addition, specific performance requirements are made according to the actual use and needs of the product.
This standard will be implemented from October 1, 1997. The panels, adjustment plates and installation boxes for concealed installation of electrical accessories shall comply with the provisions of this standard. This standard will replace GB1245-87 from the date of promulgation and implementation. This standard is proposed and managed by the National Technical Committee for Standardization of Electrical Accessories. The responsible drafting unit of this standard is Guangzhou Electric Science Research Institute of the Ministry of Machinery Industry. The main drafters of this standard are Chen Lanjin, Jin Shen'an, Chen Wu, Jiang Yuanjing and He Weien. This standard is entrusted to the National Technical Committee for Standardization of Electrical Accessories for interpretation. 1 Scope
Standard of the Machinery Industry of the People's Republic of China
Panels, adjustment plates and installation boxes for concealed installation of electrical accessories JB/T85931997
Replaces GB1245-87
This standard applies to panels, adjustment plates and installation boxes used for concealed installation of electrical accessories for household and similar environments, such as switches, sockets, bell buttons, etc., with a rated voltage not exceeding AC 440V and a rated current not exceeding 32A. Panels, adjustment plates and installation boxes for concealed installation of electrical accessories are suitable for use in ambient temperatures that generally do not exceed 35°C and occasionally reach 40°C.
This standard also applies to installation boxes for installing or suspending lighting equipment. This standard does not apply to combined electrical accessories equipped with overcurrent protection devices, nor to electrical accessories of busbar trough type. 2 Referenced standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. At the time of publication of the standard, the versions shown are all valid. All standards are subject to revision. Parties using this standard should explore the possibility of using the latest version of the following standards. GB/T700—1988
GB/T4207—1984
GB4208--1993
Technical conditions for ordinary carbon structural steel
Determination method of comparative tracking index and resistance tracking index of solid insulating materials under humid conditions (eqvIEC112-1979)
Enclosure protection grade (IP code) (eqvIEC529:1989) Fire hazard test for electrical and electronic products Glow wire test method and guide GB5169.4-198 5
(eqvIEC695-2-1:1980)
3 Definitions
Plugs and sockets for household and similar purposes - Part 1 - General requirements (egvIEC884-1:1994)Outer diameter of conduits for electrical installations and threads of conduits and accessories (idtIEC423:1993)In this standard, the following definitions apply:
3.1 FlushmountingtypebZxz.net
The installation method in which the electrical accessories are installed in the wall or other decorative plane, with only the panel exposed. 3.2 Cover-plate
The electrical accessories are exposed on the wall or decorative plane surface and are a cover that can be touched by hands. 3.3 Fixed support, sliding support. A small piece or metal part with threads in the installation box that can be screwed with the mounting screws to connect, support and fix the panel. The position of the fixed lug is fixed; the position of the sliding lug can slide, so that the installation position of the panel can be adjusted. 3.4 Knockout hole
A hole on the installation box for the wires and cables to enter and exit and fix the pipes. It is specially made in the process to facilitate the installation when it is needed. 3.5 Fixing hole
A small hole at the bottom of the installation box for fixing the installation box during installation. 3.6 Adjusting plate
A frame used as a transition connection between the panel and the installation box to keep the installation position of the panel flat. Approved by the Ministry of Machinery Industry on July 25, 1997
Implemented on October 1, 1997
3.7 Adjusting hole
JB/T8593-1997
A cylindrical hole set on the adjustment plate frame to adjust the position of the mounting screw. 3.8 Soft plastic fixing piece A rectangular elastic insulating piece located at the mounting hole of the mounting box for fixing the panel. 4 General requirements
The design and construction of the panel and the mounting box should ensure that when properly installed, they can provide adequate electrical and mechanical protection for the parts enclosed by them and protect the user or the surrounding environment from danger. Compliance is checked by carrying out all the relevant tests specified. 5 General instructions on tests
5.1 The tests carried out in accordance with this standard are type tests. The tests of insulating panels and mounting boxes shall be carried out after 10 days of preconditioning at ambient temperature and in air with a relative humidity of 50% to 85%.
5.2 Unless otherwise specified, the tests shall be carried out in the order of the clauses at an ambient temperature of (15 to 35)°C using a group of 3 new specimens. In case of dispute, the tests shall be carried out at an ambient temperature of (20 ± 5)°C. 5.3 If more than one sample fails in any test, the panel and installation box shall be deemed not to meet the requirements of this standard. If a sample fails in a certain test, the test and the previous test (or tests) that may affect its test results shall be repeated on another similar group of samples. This time, all samples shall meet the requirements of the retest to be qualified. Note:
1 The applicant may submit another group of additional samples at the same time as the first group of samples, in case the samples fail. In this way, the test station can test the additional samples without the applicant's request again, and will only be judged as unqualified if unqualified items appear again. 2 If the additional samples are not submitted at the same time, as long as one sample fails one test, it will be judged as unqualified. 6 Classification
Panels and installation boxes are classified as follows:
6.1 Classification by the nature of their materials
6.1.1 Insulating materials
6.1.2 Metals;
6.1.3 Composite materials.
6.2 Classification by installation conditions
6.2.1 Solid non-combustible walls and ceilings; 6.2.1.1 Applicable to those placed before the construction of the house (such as those suitable for pouring into concrete); 6.2.1.2 Applicable to those placed after the construction of the house (such as those not suitable for pouring into concrete). 6.2.2 Solid, combustible walls and ceilings. 6.2.3 Hollow walls, hollow ceilings, furniture, cabinet edges. 6.2.4 Wire ducts and pipes.
6.3 Classification by the temperature range during installation 6.3.1 From -5℃ to +60℃.
6.3.2 From -15°C to +60°C.
6.3.3 From -25°C to +60°C*.
6.4 Classification according to the maximum temperature during construction 6.4.1 +60°C.
6.4.2 +90°C**
JB/T8593-1997
6.5 Classification according to the degree of protection against direct contact, against the ingress of solid objects and against harmful ingress of water Classification according to the IP code of GB4208 (1993). 6.6 Classification according to suspension device
6.6.1 Without suspension device;
6.6.2 With suspension device.
Panels and mounting boxes providing double or reinforced insulation are under consideration. *These models of panels and mounting boxes are for outdoor use in cold climates. **These types of installation boxes are for use in cement precast parts and can withstand temperatures up to 90C for a short period of time. 7 Marking and indication symbols
7.1 The panel and the installation box shall be marked as follows: the name, trademark or identification mark of the manufacturer or seller; the model number (which may be the catalog number of the sample); a symbol of the degree of protection against harmful ingress of solid foreign matter, if it is higher than IP2X; a symbol of the degree of protection against harmful ingress of water, if it is higher than IPXO (i.e. TP>XO)\ and the panel is supplied with the installation box; a rated voltage and current power supply properties; such as 10A, 250V~; 10/250~; 10/250; - Where the IPXX protection level will be reduced during normal use, for example, due to the plug being inserted into the socket, the IP symbol shall also be added.
-15℃\ or "-25℃", as applicable. 7.1.1 The symbol of the degree of protection against harmful ingress of water (if applicable) shall be marked on the outside of the panel and the installation box so that after installation and wiring according to normal use requirements, the symbol can still be clearly distinguished. 7.1.2 Other markings shall remain visible after installation, including after removal of panels, accessories, etc.; the model may be marked on the packaging only.
7.2 Adjustment plate marking: only the manufacturer's name shall be marked. 7.3 The marking shall be durable and legible. Compliance shall be checked by inspection and by the following test: After rubbing the marking with a cloth soaked in water at a constant speed of 2 times/s (the forward and backward movements of the hand are each counted as one operation) for 15 seconds, it shall be wiped with a cloth thoroughly soaked in gasoline at the same constant speed for 15 seconds. Note: Gasoline is defined as the solvent hexane with a maximum aromatic content of 0.1% by volume, a shellac butanol value of 29, an initial boiling point of about 65°C, a specific gravity of about 0.69 g/cm2, equivalent to n-hexane.
Markings made by casting, pressing or engraving are not subject to this test. 7.4 Details applicable to classification according to 6.2, 6.3 and 6.4 shall be given in the manufacturer's product catalogue. 7.5 Except for those which are self-explanatory, further information on the normal use of panels and installation boxes should be given in the manufacturer's product catalog or in the instruction manual.
8 Appearance, type and size
8.1 Appearance of panels and installation boxes made of insulating and composite materials The installation surface of panels made of insulating and composite materials should be free of bubbles, cracks, missing materials, swelling; no obvious scratches, burrs, deformations, depressions, variegated spots and other defects.
The surface of the installation box made of insulating and composite materials should be free of bubbles, cracks, missing materials, obvious deformations, depressions and other defects. Note: 1) Electrical accessories with water ingress protection level are non-ordinary electrical accessories. JB/T8593—1997
8.2 Appearance of metal panels
Metal panels should have metallic luster and uniform color (except for those with plating or coating), and no obvious scratches, burrs, deformations, depressions and other defects. The plating and coating surface of the metal panel should not be rough, but should be uniform and dense, without cracks and obvious variegated colors, spots and brown rust; without gray and white corrosion, and without blistering, peeling, partial shedding and other phenomena. 8.3 Appearance of metal installation box and adjustment plate
The surface of the metal installation box and adjustment plate should have a good anti-rust protective layer. The surface of the protective layer should not be rough, without cracks, and the color should not be dull and have colored spots; there should be no brown rust and gray-white corrosion; there should be no blistering, peeling and partial shedding. The appearance is flat and the thickness is uniform. 8.4 Types and dimensions of panels and installation boxes
The type and dimensions of the panel are shown in Figure 1. The type and dimensions of the installation box are shown in Figures 2 to 9 and 12a. 8.5 Type and dimensions of the adjustment plate
The type and dimensions of the adjustment plate are shown in Figures 10 and 12b. After normal installation, the panel and the installation box should be connected well within their adjustable range, and the panel position should be flat. Compliance shall be checked by observation or manual inspection. 9 Protection against electric shock
9.1 Panels, mounting boxes and adjustment plates shall be designed so that after installation for normal use, any correctly installed accessories, electrical components or any parts of these accessories that may become live due to a fault shall not be easily accessible. This requirement does not apply to small screws that are insulated from live parts and that fix the panel to the mounting box. All mounting boxes containing electrical accessories shall have a protection degree of at least 20 (which can be checked with a standard test finger). Panels and mounting boxes shall be tested for compliance after the corresponding components are installed in accordance with the provisions of the manufacturer's instructions and product catalog. For insulating panels and mounting boxes, the following forces can be checked by observation and applying the following forces to each possible position on the parts that are easily accessible after correct installation.
For a pair of IP20 insulating panels or installation boxes, apply a force of 10N with the hingeless test finger specified in GD4208; for a pair of IP30 insulating panels or installation boxes, apply a force of 3N with a rod with a diameter of 2.5mm; for P40 insulating panels or installation boxes, apply a force of 1N with a steel rod with a diameter of imm. When in doubt, use an electrical indicator with a voltage of 40 to 50V to show the contact with the relevant parts. 9.2 Panels or installation boxes that are specifically required to have accessible metal parts, such as hooks for suspending loads, should be designed to prevent the accessible metal parts from contacting live parts or parts that will become live when the insulation fails, except that the accessible metal parts themselves can be reliably connected to the grounding circuit.
Whether it is qualified. Check by observation
9.3 Metal panels and installation boxes should have permanent grounding measures. Note: Use fixed screws or other live suspension. Compliance shall be checked by inspection and by the tests of 10 and 2. 1 Grounding
10.1 The metal installation box shall have at least two grounding holes. Compliance shall be checked by inspection or test. 10.2 The connection between the grounding terminal and the easily accessible metal parts connected thereto shall be low resistance. Compliance shall be checked by the following test: A current equal to 25A from an AC power source with a no-load voltage not exceeding 12V is passed between the grounding terminal and each easily accessible metal part in turn. The voltage drop between the grounding terminal and the easily accessible metal part is measured, and the resistance value is calculated from the current and this voltage drop. In any case, the resistance value shall not be greater than 0.050. During the test: Attention should be paid to:
JB/T8593—1997
1 Care should be taken to ensure that the contact resistance between the test probe tip and the test part does not affect the test results. 2IP>XO In the insulating installation box, when there are more than one inlet, additional devices can be installed to ensure the effective connectivity of the grounding conductor. 11 Structural requirements
11.1 Panels and boxes shall have adequate mechanical strength. Compliance is checked by inspection or by the test of clause 13. 11.2 Panels ensuring safety against electric shock shall be held in place by two or more separate parts, at least two of which require the use of a tool.
The use of only one part requiring the use of a tool, provided that it can be operated in the centre, is permitted provided that this part holds the panel firmly in place. Compliance is checked by inspection.
Note: Tests for snap-on fixings are under examination. 11.3 Boxes with IP>XO and fitted with suitable sealing gaskets or diaphragms shall provide the required degree of protection against harmful ingress of water when fitted with conduit or sheathed cable. Compliance is checked by inspection and by the test of 12.4. 11.4 The panel, adjustment plate and mounting box shall be of matching shape and size. After installation, the panel shall be flat and firmly attached to the mounting body. The adjustment plate and mounting box shall not protrude from the panel. Compliance shall be checked by inspection and measurement. 11.5 The mounting box suitable for installation in a hollow wall shall have a protection degree of at least IP20. Such mounting boxes shall have suitable means for fixing accessories and panels. Compliance shall be checked by inspection and tests, which are under consideration. 11.6 The panel and mounting box shall have fixing holes, and not less than two. Insulating panels and mounting boxes shall be constructed so that when installed with the intended fixings, any metal parts of the internal fixings are surrounded by insulation, which shall protrude from the top of the fixings by at least 10% of the maximum width of the fixing groove. Compliance shall be checked by inspection and measurement. 11.7 Where there is a conduit entry, the protective coating of the conduit and its connected accessories or cables shall be accessible and mechanically protected. The conduit inlet (if more than one, at least two of them) should be able to accommodate conduits of specified size or specified size combination in accordance with the provisions of the national standard "Outer diameter of conduits for electrical installation and threads of conduits and accessories". Compliance shall be checked by observation and test with corresponding cables or conduits. 11.8 Screw fixings of panels, accessories, etc. shall be designed to enable these parts to withstand the mechanical stresses occurring during installation and normal use.
Compliance shall be checked by observation and the following tests, and if necessary, 13.3. The screw fixings are screwed in and out
-10 times for screws screwed into threads of insulating materials and for screws of insulating materials; -5 times for all other kinds of screws.
Screws and nuts screwed into threads of insulating materials and screws of insulating materials shall be completely withdrawn and screwed in again each time. For screws that can be removed by the user, self-tapping screws are permitted (see Figure 21). For screws that can only be tightened once and used only once, self-cutting screws are permitted (see Figure 22). , use a suitable screwdriver to apply the torque shown in Table 1 for the test: 6
Nominal diameter of thread D
2.8
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