This standard is the first revision of JG/T 3001-1992. JG/T 3001-1992 will be invalidated from the date of implementation of this standard. This standard specifies the classification and model, technical requirements, test methods and inspection rules of plastic insulating electrical conduits and accessories used in buildings or structures. This standard applies to round electrical conduits and accessories made of plastic insulating materials used to protect and ensure the wiring of wires or cables in buildings or structures. JG 3050-1998 Insulating electrical conduits and accessories for construction JG3050-1998 Standard download decompression password: www.bzxz.net

JG3050-1998
This standard adopts the International Electrotechnical Commission standard IEC614-1978 "Specifications for Bushings for Electrical Installations" in a non-equivalent manner. This standard is a revision of JG/T3001-1992 "Insulating Electrical Bushings and Accessories for Buildings". The main revisions include: 1. Added the "*referenced standards" section.
2. The types of bushings have been deleted.
3. The writing format of bushing models has been changed. 4. The requirements for the minimum inner diameter of the bushing have been greatly changed. 5. The requirements for the impact resistance of the bushing have been improved.
6. The oxygen index method has been added to the flame retardancy test of the bushing. 7. More specific requirements are put forward for the storage of the product. This standard is the first revision of the JG/T3001-1992 standard. From the date of implementation of this standard, JG/T3001-1992 will be invalid.
Appendix A of this standard is the standard Appendix.
This standard is proposed and managed by the Standard and Norms Research Institute of the Ministry of Construction. This standard was drafted by the China Academy of Building Research, Changchun Engineering Plastics Electric Appliance Co., Ltd., Hangzhou Shunda Plastics Co., Ltd., Gudi Fireproof Plastic Profile Factory, and Beijing Fire Department. The main drafters of this standard are: Li Yingji, Chen Jinghui, Wang Xinhua, Xu Tingyu, Xie Shixiong, Cui Fulin, and Wang Weidong. This standard is entrusted to the China Academy of Building Research for interpretation. 519
1 Scope
Construction Industry Standard of the People's Republic of China Specification for electrical insulation conduits and fittings in buildings buildingJG3050-1998
This standard specifies the classification and model, technical requirements, test methods and inspection rules of plastic insulating electrical conduits and accessories used in buildings or structures.
This standard applies to round electrical conduits (hereinafter referred to as conduits) and accessories made of plastic insulating materials and used to protect and ensure the wiring of wires or cables in buildings or structures. 2 Reference standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard was published, the versions shown were is effective. All standards are subject to revision. Parties using this standard should explore the possibility of using the latest versions of the following standards. GB50222--1995 Code for Fire Protection Design of Interior Decoration of Buildings GB/T2406--1993 Test Method for Combustion Performance of Plastics Oxygen Index Method 3 Definitions
This standard adopts the following definitions.
3.1 Conduit
A conduit used to protect and secure the wiring of wires or cables in building electrical installation projects. It allows the insertion and replacement of wires or cables. 3.2 Insulating conduitInsulating conduitA conduit made of electrical insulating material.
3.3 Smooth conduitPlain conduit
The inner and outer surfaces of the conduit are smooth in the axial direction.
3.4 ​​Corrugated conduitCorrugated conduitThe conduit has regular concave and convex corrugations in the axial direction. 3.5 Threaded conduitThreadable conduitA smooth conduit with connecting threads.
3.6 Non-threadable conduit Conduit that is not connected by threads.
3.7 Rigid conduit Rigid conduit that can be bent only with the help of equipment or tools. 3.7.1 pliable conduit Rigid conduit that can be bent under the test conditions specified in this standard. 3.7.2 Non-self-recovering conduit Approved by the Ministry of Construction of the People's Republic of China on December 3, 1998 520 Implemented on March 1, 1999 JG3050-1998 Rigid conduit that cannot be bent under the test conditions specified in this standard. 3.8 Semi-rigid flexible conduit Flexible conduit A conduit that can be bent manually without the help of tools. 3.9 Non-flame propagating conduit Conduit that is not easily ignited by flame, or can be ignited by flame but there is no obvious flame propagation after ignition, and the flame can be extinguished within a specified time after the fire source is removed.
3.10 Non-flame propagating conduit Conduit that cannot be extinguished within a specified time after being ignited. 3.11 Wall thickness of conduit
Half of the difference between the outer diameter and the inner diameter of the conduit. 3.12 Material thickness of conduit Material thickness of corrugated conduit is the average thickness of ... corrugation cycles; the material thickness of smooth conduit is equal to the wall thickness. 3.13 Boxes and fittings of conduit refer to all devices connected or assembled with conduits, such as pipe joints, wire boxes, etc. 4 Product classification and model
4.1 Classification by connection form
4.1.1 Threaded casing
4.1.2 Non-threaded casing
4.2 Classification by mechanical properties
4.2.1 Low mechanical stress casing (hereinafter referred to as light type)4.2.2 Medium mechanical stress casing (hereinafter referred to as medium type)4.2.3 High mechanical stress casing (hereinafter referred to as heavy type)4.2.4 Ultra-high mechanical stress casing (hereinafter referred to as ultra-heavy type)4.3 Classification by bending characteristics
4.3.1 Rigid casing
a) Cold-bent rigid casing;
b) Non-cold-bent rigid casing.
4.3.2 Semi-rigid casing
4.3.3 Corrugated casing
4.4 Classification by temperature, see Table 1.
Table 1 Temperature classification of casing
Ambient temperature shall not be lower than
Overflow grade
-- Type 25
90/-25 Type
Transportation and storage
*This type of casing can withstand a temperature of 90C in precast concrete. C
Use and installation
Long-term use temperature range
15 ~ 60
-15 ~ 60
-15 ~ 60
4.5 Classification by flame retardant characteristics
4.5.1 Flame retardant casing
4.5.2 Non-flame retardant casing
4.6 Casing model
4.6.1 Basic format
O port·△
4.6.2 Code regulations
a) Name code
Main casing, G;
Variety one
b) Characteristic code
Hard pipe, Y;
Semi-hard pipe, B;
Corrugated pipe, W.
Light, 2;
Medium, 3;
Heavy, 4,
Extra heavy, 5.
c) Main parameter code
Temperature grade---25 type, 25;
-15 type, 15;
5 type 05;
-90 type, 90;
90/-25 type, 95.
JG3050
Nominal size
Temperature grade
Nominal size: 16, 20, 25, 32, 40, 50, 63. 4.6.3 Example:
Hard casing, temperature grade
5 Technical requirements
5.1 Specifications and dimensions
5.1.1 Casing specifications and dimensions
Main parameter code
Characteristic code
Name code
-25 type, mechanical properties are light, nominal size is 16, its model is: GY·225-16 casing specifications and dimensions shall comply with the provisions of Table 2. 522
Nominal size
JG3050—1998
Table 2 Casing specifications and dimensions
Minimum inner diameter d,
5.1.2 Thread specifications and dimensions of casing and accessories Semi-rigid,
Corrugated casing
Hard casing
Minimum wall thickness
Metric thread
The thread specifications and dimensions of casing and accessories shall comply with the provisions of Figure 1. For specific measurements, see 6.3.5. 8/H
Thread outer diameter
Thread swivel
8/8H=0.32476p
5/8H=0. 541 27 P
Effective diameter
Thread inner diameter
14.12713.795
H -- 0.866 03 P
Thread outer diameter
Casing length L
It can also be changed according to
transportation and engineering requirements
Effective diameter
Casing and accessories thread
Semi-hard,
Corrugated casing
25~~100
Thread inner diameter
5.1.3 Specifications and dimensions of casing and accessories
JG3050—1998
Casing accessories come in many forms, which are not specified in detail in this standard. Appendix Figures 1 to 8 list the reference specifications and dimensions of several accessories. 5.2 Technical performance
The technical performance of casing and accessories shall comply with the requirements of Table 3. Table 3 Technical requirements for casing and accessories
Maximum outer diameter
Minimum outer diameter
Minimum inner diameter
Minimum wall thickness
Compression resistance
Impact performance
Bending performance
Bending performance
Drop performance
Heat resistance
Self-extinguishing time
Oxygen index
Electrical performance
Test method||tt| |Test environment and specimen
Hard casing
Smooth,
Semi-hard, corrugated casing
Smooth,
(0.1+0.1A)≤AA≤0.1+0.1A-(0.1+0.1A)≤AA≤0.1+0.1AGauge deadweight passes
Gauge cannot pass
Gauge deadweight passes
Wall thickness is not less than that specified in Table 2
Load 1 D;≤25% at min
D≤10% at 1 min of unloading
Gauge passes by deadweight
Gauge fails to pass
Inner diameter value is not less than the minimum inner diameter value specified in Table 2
Unloading for 15min
D;≤10%
At least 10 of the 12 specimens are not damaged or cracked|At least 10 of the 12 specimens are not damaged or crackedNo visible cracks
Gauge passes by deadweight
No shattering or breaking
D≤2mm
t≤30s
01≥32
No breakdown within 15 min
R≥100 MQ
No visible cracks, gauge deadweight passed
Complex gauge deadweight passed
No shattering, breaking
Gauge deadweight passed
O1≥27
No breakdown within 15 min
R≥100 MQ
6.1.1 Unless otherwise specified, the test shall be carried out at an ambient temperature of 23℃±2℃. 6.1.2 Unless otherwise specified, three specimens shall be taken for each test. 6.1.3 The test shall be carried out 10 days after the product is produced. 6.2 Appearance inspection of casing and accessories
6.2.1 Appearance
Smooth, without cracks
No shattering or breaking
D;2 mm
01≥32
No breakdown within 15min
R≥100M0
6.2.1.1 The inner and outer surfaces of casing and accessories should be smooth, without defects such as cracks, ridges, burrs, etc. When passing through wires or cables, the casing should not damage the insulation layer on the surface of the wires or cables.
6.2.2 Determination of casing wall thickness and uniformity
6.2.2.1 Instrument
Vernier caliper with a graduation value of 0.02mm.
6.2.2.2 Determination method
Take three sleeves with a length of 1000mm, measure the wall thickness along the radial direction of the sleeve, and take four points on each section with as equal distance as possible for measurement, one of which should be the thinnest point. A total of 12 data are measured for the three tubes, the average value is A, in mm, and the deviation △A between each measured value and A should not exceed the range of ± (0.1 + 0.1A) mm. 6.3 Determination of sleeve specifications and dimensions
6.3.1 Determination of the maximum outer diameter of the sleeve
6.3.1.1 Instrument
The maximum outer diameter gauge of the sleeve is shown in Figure 2.
Nominal size of casing
6.3.1.2 Determination method
Figure 2 Gauge for maximum outer diameter of casing
Manufacturing tolerance: -0.01mm
Allowable wear: +0.01mm
Material: steel
Take three casings with a length of 1000mm and select the gauge according to Figure 2. When measuring casing of corresponding specifications, the gauge should be able to pass through the casing under the action of its own weight.
6.3.2 Determination of minimum outer diameter of casing
6.3.2.1 Instrument
Minimum outer diameter gauge for rigid casing, see Figure 3. 525
Nominal casing size
Manufacturing error
JG3050-1998
Allowable wear
Figure 3 Minimum outer diameter gauge for rigid casing
Minimum outer diameter gauge for semi-rigid casing and corrugated casing, see Figure 4. Chamfer
Material: Steel
Manufacturing tolerance: -0.01mm
Allowable wear: -0.01mm
Nominal size of casing
Figure 4 Minimum outer diameter gauge of semi-rigid casing and corrugated casing 18
Material: Steel
6.3.2.2 Determination method
Take three casings with a length of 1000mm.
JG 3050--1998
a) For rigid casing, select the gauge according to Figure 3. When measuring the casing of corresponding specifications, the casing cannot pass the gauge without any external force. b) For semi-rigid casing and corrugated casing, select the gauge according to Figure 4. When measuring the casing of corresponding specifications, the casing cannot pass the gauge without any external force.
6.3.3 Determination of the minimum inner diameter of the casing
6.3.3.1 Instrument
Hard casing minimum inner diameter gauge, see Figure 5; vernier caliper with a graduation value of 0.020 mm. Material: polished steel
Manufacturing tolerance +0.05,
Permissible wear 0.01 mm
Nominal size of casing
6.3.3.2 Determination method
Diameter d2g
5 Hard casing minimum inner diameter gauge
Take three casings with a length of 1000 mm. For hard casing, select the gauge according to Figure 5. When measuring casings of corresponding specifications, the gauge should be able to pass through the casing under its own weight. The inner diameter of semi-rigid casing and corrugated casing is measured with a vernier caliper. Three values ​​are measured evenly along the circumference of each casing. A total of 9 inner diameter values ​​are measured for three casings. Each measured value should not be less than the minimum inner diameter value specified in Table 2. 6.3.4 Determination of minimum wall thickness
6.3.4.1 Cut a section of casing and divide it into 4 equal points along the cross section. Use a vernier caliper to test one point as the thinnest point and take the average value of the 4 points.
6.3.5 Determination of thread size of casing and accessories 6.3.5.1 Instrument
Thread detection gauge, see Figure 6.
Thread outer diameter
Pitch circle diameter
dz±0. 012
6.3.5.2 Determination method
dz diameter
JG3050—1998
Manufacturing tolerance
Thread inner diameter
di±0.012
Allowable wear
+ 0. 025 5
+0. 025 5
+0. 025 5
Pitch, more than
10 threads
Thread gauge
Thread half angle
Flat wave gauge
Hole diameter
Gauge diameter
Gauge thickness
Select the thread gauge according to Figure 6. When measuring the corresponding specification of thread, the thread gauge can be screwed on the thread of the casing or fitting without much force, and the gauge cannot slide over the thread of the casing or fitting. 6.4 Determination of casing compression performance
6.4.1 Instrument
Pressure test device; Vernier caliper with a graduation value of 0.02mm; 50mm×50mm×50mm cubic steel block. 6.4.2 Determination method
6.4.2.1 Take three 200mm long specimens, measure their outer diameters, and then place the specimens in an environment with a temperature of 23°C ± 2°C for more than 10 hours.
6.4.2.2 After the conditioning is completed, place the specimens horizontally on the steel plate as shown in Figure 7, and place a cubic steel block in the middle of the specimen. Force
Square steel block
27772277277
Figure 7 Schematic diagram of compression test
6.4.2.3 Apply pressure to the cubic steel block: 528
JG3050—1998
a) For rigid casing, uniformly load the corresponding pressure value specified in Table 4 within 30s: when the load is maintained for 1min, measure the outer diameter of the pressure-bearing part, and the outer diameter change rate D at this time should be less than 25%; when the load is removed for 1min, measure the outer diameter of the casing at the pressure-bearing part again, and the outer diameter change rate D at this time should be less than 10%.
b) For semi-rigid casing and corrugated casing, when the load is applied for 30s, the outer diameter change rate of the casing is greater than 30% and less than 50%, and this pressure value is not lower than the corresponding value specified in Table 4. After holding the load for 1min, remove the load, and measure the outer diameter of the casing at the pressure-bearing part 15min later, and the outer diameter change rate D should be less than 10%.
c) Change rate of outer diameter D:, calculated as follows: D = outer diameter before compression -
outer diameter after compression × 100%
outer diameter before compression
Table 4 Casing compressive load value
Casing type
6.5 Determination of casing impact resistance
6.5.1 Instrument
Impact tester, see Figure 8.
6.5.2 Determination method
Pressure, N
Moisture pad
Casing type
Super heavy
Sub-surface A·E
Impact tester
6.5.2.1 Take 12 specimens of 200 mm in length and place them in an oven at 60℃±2C for pretreatment for 240 h. Pressure, N
(1)
6.5.2.2 Place the impact tester and the pre-treated sample into a low temperature box. A 40mm thick foam rubber pad should be placed under the impact tester. The temperature in the low temperature box is controlled as follows: a) For type-5 and type-90 casings, the temperature of the low temperature box is 5C±1C; b) For type-15 casings, the temperature of the low temperature box is -15C±1C; c) For type-25 and type-90/-25 casings, the temperature of the low temperature box is -25C±1C. 6.5.2.3 After the sample and impact tester are placed at the specified temperature of the low temperature box for 2h, place the sample on the base of the device as shown in Figure 8. 6.5.2.4 Select the corresponding specified weight and drop height according to Table 5 and impact the casing. After the test, at least 10 of the 12 casings should not be broken or have visible cracks.
Casing type
Extra heavy
6.6 Determination of casing bending performance
6.6.1 Instrument
JG3050---1998
Table 5 Weight and drop height energy of casing impact test hammer
Hard casing bending tester, see Figure 9.
Nominal size of casing
Transverse radius of mold wheel
Weight of heavy hammer
Section A-
Bending wheel track radius
Main wheel and bending wheel groove radius
Figure 9 Rigid casing bending test devicewww.bzxz.net
Semi-rigid casing and corrugated casing bending tester, see Figure 10. 530
Falling height
100±1
100±1
300±1
300±1
Bending wheel groove diameter
Tip: This standard content only shows part of the intercepted content of the complete standard. If you need the complete standard, please go to the top to download the complete standard document for free.