2022 First-class registered fire engineer technical practice test points electrical fire prevention and explosion-proof measures, firefighters must test points
Electrical equipment (device) in explosion-hazardous places are set according to the following basic requirements:
(1) The electrical equipment and lines in explosion-hazardous places must meet the requirements for electrical equipment in different environmental conditions such as chemical, machinery, heat, mold, and wind and sand in the surrounding environment; explosion-proof electrical equipment, cables and wires must be selected to meet the current national standards and approved by the nationally recognized inspection agency.
(2) The power equipment (equipment) and lines in explosion-hazardous places, especially equipment that can generate sparks during normal operation, should be arranged in non-explosive places or places with less explosion hazard; during production, staff are strictly prohibited from entering dangerous places, the control button of their electrical equipment should be installed
outside the dangerous places and interlocked with the door on the partition wall, and the electrical equipment can only be started after the door is closed.
(3) Oil-immersed equipment should be installed and used in places without vibration, inclination or fixed. Try not to use mobile or portable electrical equipment in explosive hazardous places such as explosives and combustible dust. Plug-in devices for mobile equipment should not be installed in hazardous places. If it is really necessary to set it up, you must select a socket and latch with interlocking protection device to meet the requirements of plugging in or unplugging the plug after power is cut off.
(4) Minimize the number of sockets and local lighting fixtures in explosive dust environments. If it is really necessary, the socket should be arranged in a place where explosive dust is not easy to accumulate, and local lighting should be arranged in a place where airflow is not easy to impact in the accident. The socket opening installed in a dust environment faces down one side and the angle to the vertical plane shall not be greater than 60°.
(5) Use motor for accident exhaust in dangerous places for combustible dust explosion. Control equipment such as accident start buttons should be set up in places that are easy to operate so that it can start normally in an accident.
(6) In addition to intrinsically safe electrical circuits, electrical circuits and equipment in explosion hazardous places must be equipped with overload, short circuit and grounding protection. In addition to installing necessary protection in accordance with the current national standards, motors in explosion-hazardous places must be equipped with phase-break protection. If the automatic power outage of electrical equipment may cause greater danger than the ignition risk, an alarm device is used instead of the automatic power outage device.
(7) The selection of pipe (separation) parts of distribution line junction boxes, flexible pipes and other pipes is the same as that of electrical equipment in explosion-protective levels of in explosion-hazardous places; the selection, protection and installation of explosive environmental cables and wires shall comply with the relevant requirements of the current national standards.
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