Explosion-proof lamps and their covers are designed to automatically cut off power before opening. However, due to the complexity of the interlocking mechanism, many lamps only feature a clear warning label indicating that they must not be powered on while open. Even after the lamp is turned off, the surface can remain hot, posing a risk of igniting explosive gas mixtures if the cover is opened immediately. This applies particularly to incandescent, high-pressure mercury, and high-pressure sodium lamps, which have high surface temperatures. When working with such lamps, extra caution is necessary to avoid immediate access to the cover after power is switched off.
In contrast, explosion-proof fluorescent lamps typically come with an interlocking system that ensures the power is disconnected before the cover can be opened. This enhances both convenience and safety during maintenance. Since fluorescent lamps are cold light sources, they do not generate high surface temperatures, allowing the cover to be opened safely right after the power is turned off.
When replacing bulbs or tubes, it’s essential to protect the explosion-proof joint surfaces and avoid damaging them. After cleaning, apply phosphate paste or 204-1 anti-rust oil to the surfaces—never use other types of paint. The surface should be free from rust, and if there is any minor rust, it must be properly cleaned without causing damage. The dustproof and waterproof sealing rings must be in good condition, especially for increased safety lamps. If the seal is damaged, replace it with the same type and material, and consider replacing the entire lamp if needed. Always check the integrity of the lamp cover during maintenance and replace it if broken.
Regular maintenance and timely repairs are crucial for explosion-proof luminaires. Maintenance personnel should receive proper training to understand the lamp's performance and usage requirements. They must be familiar with the lamp’s structure and components. During inspections, check the plastic housing (including transparent parts) for severe discoloration, which may indicate aging. Also, ensure that the transparent parts are undamaged and that the protective net is secure and free from corrosion. If any issues are found, stop using the lamp and repair or replace it immediately.
Dust and dirt on the lamp housing should be regularly removed to improve light efficiency and heat dissipation. Cleaning methods depend on the lamp’s protection rating—use a damp cloth or spray as indicated. Never use a dry cloth to avoid static buildup. If the light source is damaged, turn off the lamp and report the issue promptly to prevent long-term stress on electrical components like the ballast.
After opening the cover, inspect the flameproof joint surface for damage, check if the rubber seal has hardened or become sticky, and look for signs of green or carbonized insulation. Any such issues should be addressed immediately. Always follow the warning labels and disconnect the power before opening the cover. In humid environments, remove any accumulated water inside the lamp housing and replace the seals to maintain the casing’s protective function.
Avoid frequent removal or opening of sealed parts. Before closing the cover, wipe the light and transparent parts gently with a slightly damp cloth to improve brightness. Apply a thin layer of 204-1 anti-rust oil to the flameproof joint surface and ensure the seal ring is placed back in its original position. After repairs or replacements, all components, including the light source and electrical parts, must match the original specifications in model, size, and performance.
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