Electricity is the main source of power for production and life in today's society. With the continuous expansion of the scale of today's cities and the increasing degree of modern production, the power transmission and power supply system presents the characteristics of huge power supply network, complex power supply system, many power supply links, and long power supply distance. As an important connection point of the entire power supply network, the intermediate joint of the cable will directly affect the operation quality of the power supply system. Because the cable intermediate joint is manually installed on site, it is affected by the construction environment and operating environment, which will inevitably cause breakdown and explosion accidents due to installation errors, external force damage, and cable water ingress. Moreover, a large amount of energy will be released in the event of breakdown and explosion of the cable joint, which will cause harm to other surrounding power facilities or personnel, and even cause secondary accidents. In response to these problems, the company has developed a cable intermediate joint box with fireproof, waterproof and explosion-proof functions to provide all-round protection. Once the cable intermediate joint explodes or breaks down, it can effectively protect other surrounding power facilities and personnel to prevent The occurrence of secondary injury.

√ Technical features ：

1、The product shell is made of FRP. FRP is an anisotropic material, and its formula and additives have a wide range of selectivity. According to the working environment and state of FRP, special flame retardant additives are added to make the FRP material good. The main flame retardant parameters should reach: the oxygen index is 62.5%, and the performance parameters are as follows : 

技术特点
Performance	Item	Unit	Test Value
Fireproof performance	Oxygen index	%	Nil
	Incombustibility	/	Grade A
	Flame retardant	/	Qualified
Explosion-proof performance	Tensile strength	MPa	＞520
	Bending strength	MPa	＞245
	Compressive strength	MPa	＞225
	Impact strength	Kg/cm2	Grade A
	Crack hardness	HB	＞250
Physical and chemical properties	Composite strength	/	＞95
	Acid resistance	/	No obvious change after soaking for 90 days at room temperature.
	Alkali resistance	/	No obvious change after soaking for 90 days at room temperature.
	Corrosion resistance	NSS	72h neutral salt test without defect (reach grade 10)

FRP is a high-quality composite material, which has a special preventive function against various corrosive media such as acid, alkali, salt, and oil, and will not rust. Requirements for coastal areas and chemical sites and long-term direct burial. The product performance ensures that the accessory products can run stably for a long time.

2. In the joint part of the explosion-proof casing, a silicone rubber sealing ring is used to seal the casing to enhance the waterproof performance of the intermediate joint of the cable.

3. With strong pressure resistance, the shell can withstand super shock from inside or outside.

4. On the side of the explosion-proof shell, there is a hole for energy discharge sealed by a silicone rubber sealing plug, and the direction of the energy discharge hole can be adjusted. Once the cable intermediate joint explodes, the sealing plug on the energy discharge hole can quickly open the energy discharge hole, effectively preventing In order to avoid damage to other cables or the surrounding environment, the flame retardant performance of the shell can also ensure that the internal flame is extinguished due to lack of oxygen.

5. The installation is convenient and quick, and can meet the laying requirements of 10kv, 35kv single-core and three-core cables.

6. Safe and reliable, widely used in the power supply network of various high-risk industries and key projects such as electric power, coal, chemical industry, etc.

√ Instructions for use of FRP explosion-proof box are as follows ：

一、 Model

Our company's FRP explosion-proof box model is VB, which is used for the protection of the intermediate joints of single-core and three-core cables.

1.VB-1600-125-70 (suitable for 10kV three-core or 35kV single-core joints)

2.VB-1600-140-80 (suitable for 10kV three-core or 35kV single-core joints)

3.VB-1600-160-100 (suitable for 10kV three-core or 35kV single-core joints)

4.VB-1600-180-100 (suitable for 10kV three-core or 35kV single-core joints)

5.VB-1800-180-100 (suitable for 10kV three-core or 35kV single-core joints)

6.VB-1100-180-100 (suitable for 10kV three-core or 35kV single-core joints)

7.VB-1620-255-125 (suitable for 35kV three-core joints)

8.VB-2000-280-125 (suitable for 35kV three-core joints)

9.VB-2300-280-125 (suitable for 35kV three-core joints)

二、 Structure

The glass fiber reinforced plastic explosion-proof box is divided into upper and lower parts, both of which are in the shape of a boat with a constriction at the large ends in the middle.

三、Type

· Diarrhea type ：

This type of product should be provided with two energy-removing holes on one side of the explosion-proof box. Adjust the energy-reducing holes to align with the safe direction during installation. Prevent explosion damage to other cables or other facilities in the channel, and prevent external force from damage to the joint. This type of explosion-proof box is suitable for the protection of intermediate joints in cable trenches or directly buried environments, and has the characteristics of convenient installation.

· Flame retardant type：

This type of product fills the shell with dry powder flame retardant after the explosion-proof box is installed, and then seals the energy relief hole with a silicone rubber sealing plug. In the event of an explosion in the intermediate joint of the electrical connection, in addition to the energy release plug opening the energy release, the flame retardant in the shell can prevent the spread of the open flame caused by the explosion. This type of explosion-proof box is suitable for the protection of intermediate joints in the cable channel, and needs to have good flame-retardant and explosion-proof effects.

· Waterproof and explosion-proof type ：

The vent hole on one side of the explosion-proof box of this type of product is used as a gate, and the other is used as an air outlet. After the product is installed, the high-pressure sealant AB components are fully mixed and poured into the shell. When the sealant solidifies, it is connected in the middle to form a whole, which plays a very good waterproof sealing effect. This type of explosion-proof box is suitable for water immersion environments. In addition to the shell can be waterproof, the solidified sealant further strengthens the waterproof performance, effectively solving the explosion accident caused by moisture and water.

	Production Ability • 8 professional production lines • 7900 square meters of workshop area • dozens of cable accessories production equipment
R&D Capabilities • many years of experience in R&D and customization of cable accessories, Professional R&D team • a number of professional technical engineers • mature professional technologies such as conductor link and electric field control. • Passed and obtained a number of qualification certifications
	Honorary Certification • CE and SGS certification reports underwritten by PICC • High-tech Enterprise • Jiangsu cable accessories industry (top ten) • Jiangsu energy saving and environmental protection  products

	Provide reasonable and professional use and matching solutions according to customer needs. After signing the contract, a special person will be responsible for process follow-up, timely control the progress, and cooperate with logistics to ensure the smooth delivery of the order. Perfect after-sales guarantee system, 30-year warranty, manuals and professional installation instructions are provided at the same time

Suzhou Jiuwei Electric Made Co., Ltd. integrates research and development, production and processing, wholesale, distribution, trade and service. It is adjacent to the Suzhou River, with convenient transportation and a complete and scientific quality management system. The company's main products are insulating materials and cable accessories, with a complete product system, among which the representative products are: cold and heat shrinkable cable accessories; fusion cable accessories, wrap-around cable accessories, explosion-proof boxes, heat shrinkable sleeves , heat shrinkable insulation protection box; at the same time, we can provide cutting, processing and forming services according to customer requirements.......