In explosive hazardous environments, the correct layout of electrical circuits is crucial for ensuring the safe operation of LED explosion-proof light fittings. This article will detail the design and installation requirements for the electrical circuits of LED explosion-proof light fittings, helping users understand how to install and maintain explosion-proof light fittings safely and effectively in hazardous environments.

Selection of Electrical Circuit Locations for LED Explosion-Proof Light Fittings

When installing LED explosion-proof light fittings, the selection of circuit locations is crucial. Electrical circuits should be laid in areas with lower explosion risks or further away from the release source. This location selection not only reduces the impact of explosion hazards on the circuits but also enhances the safety of the electrical system. Ensuring that circuits are away from potential explosion sources is fundamental to the normal operation of the explosion-proof light fittings.

Installation Methods for LED Explosion-Proof Light Fittings

In explosive hazardous environments, LED explosion-proof light fittings electrical circuits mainly have two installation methods: explosion-proof steel pipe wiring and cable wiring. Explosion-proof steel pipe wiring is suitable for harsher environments as it effectively protects electrical circuits from external influences. Cable wiring, on the other hand, offers a more flexible wiring method that can be adjusted according to specific installation needs. Selecting the appropriate installation method helps enhance the safety and reliability of explosion-proof light fittings.

The Importance of Isolation Sealing

During the installation of electrical circuits, isolation sealing is also critical. When circuits pass through partition walls or floors between different explosion hazard zones, non-combustible materials should be used for tight sealing. Such isolation sealing measures can effectively prevent explosive hazardous substances from entering the circuit system, ensuring stable operation of LED explosion-proof light fittings in various environments.

Material and Connection Requirements for LED Explosion-Proof Light Fittings Wires

When selecting materials for wires used in LED explosion-proof light fittings, reasonable choices should be made based on the hazard level of the explosive environment. In Zone 1, distribution circuits should use copper core wires or cables to ensure their safety and reliability. In environments with severe vibration, multi-core flexible copper wires or multi-core copper cables should be used. It is notable that aluminum core power cables should not be used underground in coal mines to avoid potential safety hazards.

In Zone 2, power circuits can use aluminum core wires or cables with a cross-sectional area of 4mm² or larger, and light fittings circuits can use aluminum core wires or cables with a cross-sectional area of 2.5mm² or larger. These regulations ensure that electrical circuits in different environments meet safety requirements, ensuring the stability of LED explosion-proof light fittings.

Allowable Current Carrying Capacity of Electrical Circuits

For Zones 1 and 2, the cross-section of insulated wires and cables must have an allowable current carrying capacity that is no less than 1.25 times the rated current of the fuse link and the long-time overcurrent trip setting current of the circuit breaker. Additionally, the allowable current carrying capacity of the circuits leading to low-voltage cage induction motors should not be less than 1.25 times the rated current of the motor. These requirements ensure the safety of electrical circuits under high load conditions.

Connection of Electrical Circuits

In the electrical circuits of Zones 1 and 2, intermediate joints must be performed within explosion-proof terminal boxes or junction boxes that match the hazard level of the environment. For Zone 1, explosion-proof terminal boxes are recommended, while Zone 2 can use increased safety terminal boxes. Additionally, when aluminum core cables or wires are used in the electrical circuits of Zone 2, there must be reliable identification to facilitate correct installation and maintenance by users.