What Is Intrinsic Safety (Ex i)?

Intrinsic Safety (Ex i) is a widely used explosion protection method for electrical equipment installed in hazardous areas. It works by limiting the electrical energy within a circuit so that, even under normal operation or specified fault conditions, any sparks or heat generated cannot ignite flammable gases, vapors, or dust.

This approach ensures safe operation without relying on flameproof enclosures or other mechanical protection methods.

Typical Applications

Intrinsic Safety is ideal for low-power electrical and electronic equipment, including:

• Industrial instruments and sensors

• Portable and handheld devices

• Battery-powered equipment

• Wireless communication devices

These products are easier to design in compliance with Intrinsic Safety requirements due to their low energy consumption.

Applicable Standards

Common Intrinsic Safety standards include:

•  GB/T 3836.1 (China)

•  GB/T 3836.4 (China)

• IEC 60079-11 (International)

• EN 60079-11 (Europe)

• UL 913 (North America)

Compliance with these standards helps ensure that equipment can be safely used in explosive atmospheres.

Technical Evaluation

Before certification, products typically require a technical assessment, including:

Electrical schematics

• PCB layout

• Component datasheets

• Battery specifications (if applicable)

• Wireless module information (if applicable)

These documents are reviewed to verify compliance with Intrinsic Safety requirements.

Why Intrinsic Safety Certification Matters

Intrinsic Safety certification helps reduce ignition risks in hazardous environments and protects both personnel and equipment. It is also an essential market access requirement for many industries, including oil & gas, chemical processing, mining, pharmaceuticals, and industrial automation.

Our Services

Sino Testing Services（STS） provides professional Intrinsic Safety testing and certification support in accordance with international standards.

Just fell free to contract with us for any Ex knowledge.