Inspection Before Explosion-Proof Electrical Installation

1. Explosion-Proof Markings

Explosion-proof designations, such as “Exd II CT6,” should be clearly marked or cast on the outer casing of the equipment.

2. Product Nameplate

• Explosion-proof markings;

• Explosion-proof certification number;

• Production license symbol;

• Specific requirements;

• Date of manufacture/serial number.

3. Overall Appearance

• Explosion-proof metal enclosures: Ensure wall thickness and surface finish (casting and argon welding) are smooth and free from irregularities to meet explosion strength standards and porosity requirements.

• Larger products should maintain effective heat dissipation and meet temperature classification needs to extend service life.

• Equipment should feature both internal and external grounding with clear grounding indications.

• Check the configuration of electrical entry devices to support necessary construction wiring.

4. Structural Rationality

Components such as decoder boxes and power supply units should accommodate a specific number of circuits and the maximum allowable current and power.