This standard specifies the technical requirements, test methods, inspection rules, marking, instruction manual, packaging, transportation and storage of flame-retardant PVC plastic flat conduits for electrical installation. This standard applies to flame-retardant PVC plastic rigid and flexible self-healing insulating material flat conduits made of polyvinyl chloride resin as the main raw material and other additives through extrusion molding. This product is suitable for the protection of wires and cables in industrial and construction projects below 2000V. GA 305-2001 General Technical Conditions for Flame-retardant PVC Plastic Flat Conduits for Electrical Installation GA305-2001 Standard Download Decompression Password: www.bzxz.net

GA 305--2001
All technical contents of this standard are mandatory.
This standard is formulated based on the existing GB/T14823.2-1993, GB/T14823.4-1993, etc. GB/T14823.2--1993
and GB/T14823.4-1993 are equivalent to IEC614-2-2 and IEC614-2-4. The formulation of this standard provides a unified product standard for the production of flame-retardant PVC plastic flat conduits (rigid conduits and bendable conduits) for electrical installation, and provides a unified inspection basis for the supervision and management of such products. Appendix A of this standard is the appendix of the standard.
This standard is proposed by the Fire Department of the Ministry of Public Security of the People's Republic of China. This standard is under the jurisdiction of the Seventh Technical Committee of the National Technical Committee for Fire Protection Standardization. This standard is drafted by the Sichuan Fire Science Research Institute of the Ministry of Public Security. The main drafters of this standard are: Sun Yuhu, Wei Hua, Feng Jun. 5.13
1 Scope
People's Republic of China Public Security Industry Standard Flame-retardant PC Plastic Plain Conduits for Electrical Installations
General Specifications
General Specifications for Plain Conduits offlame-retardant PVC plastics for electrical installationsGA305—2001
This standard specifies the technical requirements, test methods, inspection rules, marking, instruction manual, packaging, transportation and storage of flame-retardant PVC plastic plain conduits for electrical installations.
This standard applies to flame-retardant PVC plastic rigid and flexible self-healing insulating material plain conduits made of polyvinyl chloride resin as the main raw material and other additives through extrusion molding. This product is suitable for the protection of wires and cables in industrial and construction projects below 2000V. 2 Referenced Standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard is published, the versions shown are valid. All standards will be revised, and parties using this standard should explore the possibility of using the latest versions of the following standards. GB/T2406-1993 Test method for burning performance of plastics - Oxygen index method GB/T2408--1996 Test method for burning performance of plastics - Horizontal method and vertical method GB/T2829--1987 Periodic inspection counting sampling procedure and sampling table (applicable to production process stability inspection) GB/T8627-1999 Test method for smoke density of burning or thermal decomposition of building materials GB9969.1--1998 General provisions for industrial product instruction manuals GB/T14823.2-1993 Special requirements for conduits for electrical installation - Flat conduits made of rigid insulating materials 3 Special requirements for conduits for electrical installation - Bendable and self-healing flat conduits made of insulating materials GB/T 14823.4-1993
3 Definitions and abbreviations
The following definitions are adopted in this standard.
3.1 Plain conduits of flame-retardant PVC plastics for electrical installations
Using polyvinyl chloride resin as the main raw material, adding other additives and extruding to form a straight conduit for protecting wires and cables in industry and construction projects.
3.2 Abbreviations
Plain conduits of flame-retardant PVC plastics for electrical installations
Rigid conduits Flame-retardant PVC plastics for electrical installations Rigid insulating material plain conduits Bend conduits Flame-retardant PVC plastics for electrical installations Bendable self-healing insulating material plain conduits Approved by the Ministry of Public Security of the People's Republic of China on August 21, 2001 5.1
Implemented on February 1, 2002
4 Classification
4.1 Classification based on mechanical properties
a) conduits with less mechanical stress (light pipes); b) conduits with medium mechanical stress (medium pipes); c) conduits with heavy mechanical stress* (heavy pipes). Note: *Applicable only to rigid conduits.
4.2 Classification by temperature
For classification by temperature, see Table 1.
Temperature grade
GA 305—2001
Table 1 Classification of pipe temperature
Temperature is usually not lower than
Storage and transportation
+ 90/25
1) When used in precast concrete, it will be subjected to a temperature of +90C for a short time. 4.3 Classification by degree of bending
a) Rigid pipe;
b) Bendable pipe.
5 Requirements
5.1 Marking, size and structure
5.1.1 Marking
a) After inspection, the marking should be clear;
b) Unqualified ones are classified as Class C.
5.1.2 Dimensions
a) Rigid conduits
The inner and outer diameters of the conduits shall comply with the requirements of Table 2. Table 2
Tolerance of outer diameter
Light-duty conduits
Minimum inner diameter
Medium-duty conduits
Heavy-duty conduits
b) Bendable conduits
The outer and inner diameters of the conduits shall comply with the requirements of Table 3. Use and installation
Rigid conduit inner and outer diameter dimensions
Long-term use temperature range
5～60
-10～60
15～60
-5～~60t
Outer diameter tolerance
Minimum inner diameter
GA305--2001
Inner and outer diameter dimensions of bendable conduits
c) Other dimensions and manufacturing lengths of conduits can be agreed upon by both the supplier and the buyer. d) Defects are classified as Class B.
5.1.3 Appearance and structure
a) The inner and outer walls of the conduit should be smooth, without obvious defects such as bubbles, cracks and uneven color; the inner and outer surfaces should be free of ridges and similar defects: the edge of the pipe mouth should be smooth and not damage the insulation layer of wires and cables. b) Wall thickness uniformity
The wall of the conduit shall be uniform. After the wall thickness uniformity inspection in 6.4, the wall uniformity shall meet the following formula: IM, - M ≤ 0.1M + 0.1 mm (i = 1,2,3,...12)M=
Wherein, M-…-each measured value of wall thickness, a total of 12 values, mm; M----the average value of 12 measured values, mm. c) Failures shall be classified as Class C.
5.2 Technical requirements
5.2.1 Electrical and mechanical properties
a) Rigid conduits
The electrical and mechanical properties of rigid conduits shall meet the requirements of Table 4. 12
Table 4 Technical requirements for rigid conduits
Pressure resistance
Impact resistance
Bending resistance
Technical requirements
After the conduit is subjected to the pressure test specified in 7.5.1 of GB/T14823.2--1993, the difference between its original outer diameter and the outer diameter after the pressure is not evacuated shall not exceed 25% of the original outer diameter
After evacuating the pressure for 1 minute, the difference between the original outer diameter and the outer diameter of the flattened part shall not exceed 10% of its original outer diameter
After evacuating the pressure, the conduit should not have visible cracks. 12 conduits were subjected to the pressure test specified in GB/T14823.2--1993, After the impact test specified in 7.5.2 of GB/T 3.2-1993, at least 9 conduits with outer diameters of 16mm, 20mm and 25mm shall have no visible cracks or damage. After the bending test specified in 7.5.3 of GB/T 14823.2-1993, there shall be no visible cracks on the outer surface.
Unqualified classification
Bending resistance
Heat resistance
Electrical insulation performance
b) Bendable conduits
GA305—2001
Table 4 (End)
Technical requirements
Outer diameters of 16mm, 20mm and 25mm shall be 16mm, 20mm and 25mm. After the flexure test specified in 7.5.4 of GB/T11823.2-1993, the outer surface of the duct with a diameter of 25 mm and 10 mm shall not show visible cracks.
The gauge of the corresponding size of the inner diameter ID item in Table 4 of GB/T14823.2-1993 shall be able to pass through the duct under the action of its own weight and without initial velocity. After the duct with a spherical pressure heat resistance test specified in 7.6 of GB/T14823.2-1993, the indentation pressure diameter shall not be greater than 2 mm. After the duct with a spherical pressure heat resistance test specified in 7.6 of GB/T14823.2-1993, the indentation pressure diameter shall not be greater than 2 mm.8 After the electrical insulation test specified in GB/T14823.4-1993, the difference between the outer diameter of the conduit and the outer diameter after being flattened shall not be greater than 10% of the original outer diameter. Visible cracks should appear
After the 12 tubes are subjected to the impact test specified in 7.5.2 of GB/T14823.4--1993, at least 9 of the tubes have no visible cracks on their surfaces
After the tubes are subjected to the bending test specified in 7.5.3 of GB/T14823.4--1993, no visible cracks appear, which can meet the requirements of GB/T14823.4-1993 Figure 3 and the gauge of the corresponding size of the inner diameter D item in Table 4 shall pass under the action of its own gravity without any initial velocity.
After the duct is subjected to the bending test specified in 7.5.4 of GB/T14823.4-1993, no cracks visible to the naked eye shall appear. The gauge of the corresponding size of the inner diameter D item in Figure 3 and Table 4 of GB/T14823.4-1993 shall pass under the action of its own gravity without any initial velocity.
After the duct is subjected to the heat resistance test specified in 7.6 of GB/T14823.4-1993, it shall allow the gauge of the corresponding size of the inner diameter D item in Figure 3 and Table 4 of GB/T14823.4-1993 to pass under the action of its own gravity without any initial velocity.
Unqualified classification
Unqualified classification
Electrical insulation performance
5.2.2 Combustion performance
GA 305—-2001
Table 5 (end)
Technical requirements
After the duct is subjected to the electrical insulation test specified in 7.8 of GB/T14823.4-1993, there shall be no breakdown or flashover phenomenon and its insulation resistance shall not be less than 100Ma
The combustion performance of the duct shall comply with the requirements of Table 6 Table 6 Combustion performance of duct
Test method
6.1 General requirements
Test items
Oxygen index
Horizontal combustion performance
Smoke density level
Test basisbzxz.net
GB/T 2406
GB/T 2408
GB/T 8627
6.1.1 The catheter shall be tested 24 hours after the completion of manufacture Technical performance
FH-1 level
Unqualified classification
Defect classification
6.1.2 Unless otherwise specified, the test is usually carried out at room temperature of 10~~~35C: during arbitration inspection, the test should be carried out at 25C±5C.
6.1.3 Unless otherwise specified, each test item shall be carried out on three specimens. Randomly select three catheters, each of which is not less than 2m long, and cut specimens for various tests from these pipes. Each catheter provides one specimen for each test. 6.2 Marking
Use a piece of pure cotton cloth fully soaked in water at a speed of 2 times/s (each hand forward and backward movement counts as one time) to wipe the same mark at a uniform speed for 15s, and then use a piece of pure cotton cloth fully soaked in gasoline to wipe at the same speed for 15s. 6.3 Dimensions
The dimensions of rigid conduits shall be tested in accordance with the method specified in 7.3 of GB/T14823.2-1993. The dimensions of bendable conduits shall be tested in accordance with the method specified in 7.3 of GB/T14823.4-1993. 6.4 Appearance and structure
The dimensions of rigid conduits shall be tested in accordance with the method specified in 7.4 of GB/T14823.2-1993. The dimensions of bendable conduits shall be tested in accordance with the method specified in 7.4 of GB/T14823.4-1993. 6.5 Electrical and mechanical properties
The electrical and mechanical properties shall be tested in accordance with the methods specified in Tables 7 and 8. a) Rigid conduit
Table 7 Test methods for electrical and mechanical properties of rigid conduits Item
Standard number
b) Flexible conduit
Pressure test
Impact test
Bending test
Bending test
GB/T14823.21993
Ball pressure heat resistance test
Electrical insulation test
Standard number
6.6 Combustion performance test
Pressure test
GA 305-—2001
Test methods for electrical and mechanical properties of flexible conduits Impact test
The combustion performance shall be tested according to the method specified in Table 9. Bend test
Bending test
GB/T 14823.41993
Table 9 Combustion performance test method
Test method
7 Quality assessment procedures and inspection rules
7.1 Quality assessment procedure
Oxygen index method
GB/T2406
Horizontal method
GB/T2408
Heat resistance test
Electrical insulation test
Smoke density test method
GB/T 8627
See Chapter 5 for defect classification. The principles for determining whether the product quality is qualified are: A-0, B≤1, B+C<3. 7.2 Inspection rules
7.2.1 Inspection classification
The inspection of ducts is divided into factory inspection and type inspection. 7.2.2 Factory inspection
a) All conduits submitted for delivery shall be inspected according to the factory inspection rules. The inspection items include: marking inspection;
dimension inspection;
appearance and structure inspection.
b) Factory inspection shall be carried out by random sampling from each batch of delivered goods, and the sampling inspection and evaluation shall be carried out according to the relevant provisions of GB/T2829. ) The strictness of the sampling plan for factory inspection shall be adjusted according to the "Transfer Rules\" in 4.6.3 of GB/T2829-1993 and determined by the factory's quality inspection department.
d) Qualified products after factory inspection can be delivered as finished products, and unqualified products and unqualified batches shall be reworked in full, and those that are still unqualified shall be scrapped. c) The items of delivery inspection, the number of samples and the qualified judgment method can be agreed upon by the supplier and the buyer. ") The ordering party has the right to check whether the quality of the catheter is qualified. If necessary, the manufacturer shall provide the type inspection and factory inspection reports of the catheter for inspection.
g) If there is a dispute during delivery, it shall be resolved by negotiation between the supplier and the buyer until it is submitted to a higher-level quality inspection department or statutory department for arbitration. 7.2.3 Type inspection
a) The catheter shall be subjected to type inspection in any of the following situations: · When a new product is put into production or an old product is converted to production; · When the catheter has major changes in design, process, or materials; · When production is resumed after a suspension of more than half a year;
When the factory inspection results are significantly different from the previous type inspection results; When the national quality supervision agency or fire supervision department makes a type inspection request; For catheters produced in batches, regular random sampling inspections shall be carried out at least once a year. b) The items for type inspection include all the items specified in Chapter 6. 549
8 Markings, labels, and instruction manuals
8.1 Each batch shall be marked with
a) the manufacturer's name, trademark, or other identification symbol; GA 305—2001
b) Model, outer diameter, conduit length, performance standard number. 8.2 The first mark should be about 50mm away from the end of the conduit, and the conduit should be re-marked every 1m thereafter. 8.3 The order of marking is as follows:
F20B25G2-GA305—2001
The entire mark indicates:
Flame retardant, outer diameter 20mm, able to withstand medium mechanical stress, temperature grade -25°C, rigid insulating conduit. For the meaning of the marking code, see Appendix A (Standard Appendix). 8.4 Instructions for use
The instructions for use are written in accordance with the provisions of GB9969.1. 9 Packaging, transportation and storage
9.1 Packaging
9.1.1 Each batch of catheters delivered should be accompanied by product standard requirements and inspection certificates before packaging. 9.1.2 Rigid catheters should be packaged in bundles, with the weight of each bundle not exceeding 25kg, and wrapped in polyethylene bags on the outside. Bendable catheters should be packaged in discs, with the weight of each disc not exceeding 35kg, and appropriate packaging should be used on the outside. This accessory should be packaged in cartons. 9.1.3 The packaging bags and boxes should be marked with: manufacturer name (or trademark), factory address (or place of origin), catheter name, type (specification), factory (production) date, quantity (quality), etc.
9.2 Transportation
9.2.1 The product shall not be displaced, collided or shaken in the packaging. The packaging must ensure that the tube will not be damaged due to poor packaging during transportation.
9.2.2 The tube packed in the packaging box shall not exceed 100kg. If required by special circumstances, it can be negotiated by both parties and the transportation department. 9.2.3 The tube should be protected from collision, throwing, falling, sun exposure, rain, etc. during transportation. 9.3 Storage
The product should be stored in a well-ventilated and dry environment (1m away from the heat source) and shall not be stored in the open air. 550
Flame retardant performance
The flame retardant performance code is F.
Mechanical performance grade
Mechanical performance grade code is shown in Table A1.
Mechanical performance grade
Light tube
Medium tube
Heavy tube
3 Overflow grade
Temperature grade code is shown in Table A2.
Temperature grade
-15℃
-45℃
+90℃
+90℃/-25℃
Flexibility
Flexibility code is shown in Table A3.
Flexibility
Rigid conduit
Flexible conduit
Electrical properties
Electrical properties code is 2.
GA 305-2001
Appendix A
(Appendix of the standard)
Marking code
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