General requirements for electrical explosion protection
Various types of explosion-proof equipment have different characteristics. But they are all explosion-proof electrical equipment, which has common characteristics in how to achieve electrical explosion protection. This is the general requirement for explosion-proof electrical equipment.
(1) The ambient temperature of the equipment is -20 ° C ~ 40 ° C, and the ambient air pressure is (0.8 ~ 1.1) × 105 Pa.
(2) If the equipment is a plastic casing, it must be made of non-combustible or flame-retardant materials, and ensure that the surface insulation resistance of the plastic surface is not more than 1 × 109 Ω to prevent accumulation of static electricity, and must also withstand impact tests and thermal stability experiments.
(3) use of equipment limitations aluminum alloy housing, preventing friction with iron rust dangerous temperature.
(4) Fasteners, nuts, bolts, and spring pads must be complete. The bolt head and nut should be placed in the retainer and only opened with special tools.
(5) The equipment is equipped with a safety interlock. In order to prevent accidents caused by misoperation of electrical equipment, explosion-proof electrical equipment should be equipped with interlocking devices. When the interlock is installed, the detachable part of the device cannot be removed. When the detachable part is removed, the device cannot be powered to ensure safety.
(6) The insulating sleeve of the metal separator passing through the equipment must be made of a small moisture-absorbing insulating material. If a cement is required, the cement must have mechanical, thermal and chemical resistance.
(7) For Class I electrical equipment with equipment power greater than 250W and current greater than 5A, connectors and junction boxes shall be used for the connection of cables and wires.
(8) The connecting piece is used in the junction box, and the power supply line (cable) is used for wiring (also called terminal block), and its mechanical strength is sufficient. For aluminum and copper cable connection member to use aluminum transition joints.
(9) The introduction device in the cable access equipment must select the appropriate sealing ring according to the specified requirements to meet the requirements of the sealed wiring.
(10) Explosion-proof electrical equipment must be designed with grounding bolts. When the equipment is put into use, the equipment should be reliably grounded with cables or wires with the required cross section.
(11) Explosion-proof equipment should have obvious explosion-proof marks, and the installation is firm and durable.
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