Shenhai Explosion-Proof
Explosion-proof lighting fixtures are a category of lights designed with explosion protection features, marked with an “Ex” symbol. These fixtures have specific sealing properties and additional protective measures in their structure, as mandated by national standards. Unlike non-explosion-proof lights, they adhere to several unique requirements:
1. Explosion-proof Category, Grade, and Temperature Group: These are defined by national standards.
2. Types of Explosion-proof Protection:
There are five main types – flameproof, increased safety, positive pressure, non-sparking, and dust explosion-proof. They can also be a combination of these types or be of a composite or special kind.
3. Electric Shock Protection:
Classified into three categories – I, II, and III. The purpose is to prevent electric shocks from accessible parts or conductors at different potentials, which might ignite explosive mixtures.
Type I: Based on basic insulation, conductive parts that are normally non-live and accessible are connected to a protective earth conductor in the fixed wiring.
Type II: Uses double or reinforced insulation as safety measures, without grounding.
Type III: Operates on a safe voltage not exceeding 50V and doesn’t produce higher voltages.
Type 0: Relies solely on basic insulation for protection.
Most explosion-proof lighting fixtures fall under Type I, with a few being Type II or III, such as all-plastic explosion-proof lights or explosion-proof flashlights.
4. Enclosure Protection Level:
Various protection methods for the enclosure are used to prevent the ingress of dust, solid objects, and water, which could lead to sparking, short-circuiting, or compromising the electrical insulation. Characterized by “IP” followed by two digits, the first digit represents protection against contact, solids, or dust (ranging from 0-6), and the second against water (ranging from 0-8). As sealed fixtures, explosion-proof lights have at least a level 4 dust protection.
5. Material of Mounting Surface:
Indoor explosion-proof lights might be mounted on ordinary combustible surfaces like wooden walls and ceilings. These surfaces must not exceed a safe temperature due to the light fixtures.
Based on whether they can be mounted directly on ordinary combustible materials, they are categorized into two types.
Summary – “How are explosion-proof lights different from regular lights?”: Regular lights are used in non-hazardous locations without flammable gases or dust. Unlike explosion-proof lights, they lack explosion-proof grades and types. Regular lights mainly serve illumination purposes, while explosion-proof lights not only provide illumination but also offer explosion protection, ensuring the safety of personnel and preventing property damage.