RVS Twisted Soft Wire (Fire Alarm Cable): Types, Specifications, Advantages & Applications Explained

What is RVS Twisted Soft Wire?

RVS twisted soft wire is a PVC insulated copper core flexible twisted electrical wire, widely used in fire alarm systems and control signal transmission.

It is commonly known as “twisted pair wire” or “fire alarm cable”, and is manufactured according to JB/T 8734.3-2012 standard.

The rated voltage is:

• 300/300V

Cable Structure

RVS cable has a simple structure:

• Copper conductor

• PVC insulation

Its twisted pair design improves signal stability and anti-interference performance, making it suitable for fire protection systems.

Common Types of RVS Cables

1. RVS (Standard Type)

Copper core PVC insulated twisted soft wire

• General-purpose fire alarm and signal wiring cable

2. ZR-RVS (Flame Retardant Type)

Copper core PVC insulated flame-retardant twisted wire

• Improved fire safety performance

• Slows down flame spread in emergency conditions

3. NH-RVS (Fire Resistant Type)

Copper core PVC insulated fire-resistant twisted wire

• Maintains circuit integrity during fire conditions

• Suitable for emergency systems

4. WDZN-RVS (Low Smoke Halogen Free Type)

Copper core LSZH flame-retardant fire-resistant twisted wire

• Low smoke emission

• No halogen gas release

• High safety for public buildings

Key Electrical & Physical Properties

PVC insulated wires offer:

• Excellent electrical insulation performance

• Stable dielectric properties with low loss

• Good mechanical strength and flexibility

• Moisture resistance and chemical resistance

• Anti-aging and long service life

Temperature & Installation Conditions

• Installation temperature: not lower than 0°C

• Long-term operating temperature: ≤ 70°C

• Rated voltage: 300/300V

• Suitable for indoor fixed wiring systems

Advantages of RVS Twisted Wire

1. Excellent Insulation Performance

PVC insulation ensures stable electrical performance and high dielectric strength.

2. Flame Retardant Safety

PVC material provides good flame resistance, widely used in fire protection systems.

3. Strong Mechanical Properties

Improved hardness and abrasion resistance ensure durability in long-term use.

4. Chemical Resistance

Resistant to acids, alkalis, oils, and various industrial chemicals.

Application Range of RVS Cable

RVS twisted soft wire is widely used in:

• Fire alarm systems

• Smoke detectors and alarm devices

• Public address (PA) systems

• Building electrical wiring

• Home lighting and appliances

• Instrumentation signal transmission

• Security and control systems

It is especially important in fire protection and emergency communication systems.

Key Notes

• Suitable for AC 50Hz power systems

• Designed for low-voltage signal and control transmission

• Twisted structure helps reduce electromagnetic interference

• Commonly used as fire alarm loop wiring cable

Conclusion

RVS twisted soft wire is a cost-effective and reliable solution for fire alarm and signal transmission systems. With strong insulation, flexible structure, and good flame-retardant performance, it is widely used in residential, commercial, and industrial safety systems.