Ordinance on Industrial Safety and Health
Ministry of Labour Ordinance No. 32 of September 30, 1972
Latest Amendments:
Ministry of Health, Labour and Welfare Ordinance No. 47 of March 30, 2007
In Japanese
掲載日：2008.03.28
Part II Safety Standards
Chapter IV Prevention of Explosion, Fire, etc
Section 4 Control of Fires, etc.
Article 279 (Prohibition of Use of Fire at Places Where Dangerous Substances, etc., Exist)
- (1) The employer shall not use machines, etc., or fires that produce sparks or arcs, or that reach a high temperature and are liable to become an ignition source, or use fire at places where it is liable to cause explosion or fire due to existence of combustible dust other than dangerous substances, gunpowder, a large quantity of easily flammable substances or dangerous substances.
- (2) A worker shall not use machines, etc., or fires that are liable to become an ignition source or fire set forth in the preceding paragraph at places set forth in the same paragraph.
Article 280 (Electric Machine and Appliance Used in Places with a Danger of Explosion)
- (1) The employer shall, when using electric apparatuses (meaning those other than wiring and movable electric cable among machines or instruments in which the electricity conducts such as a motor, transformer, cable connector, switch, distribution board or switch board and other equipment, the same shall apply hereinafter) at the place where it is liable that the concentration of the vapor of flammable substance or flammable gas becomes to explosion limit even if the measures set forth in Article 261 are taken, not use unless they are of explosion proof performance corresponding to the types of the said vapors or gases.
- (2) A worker shall not use electric machine and appliance other than explosion-proof types set forth in the preceding paragraph at places set forth in the same paragraph.
Article 281
- (1) The employer shall, as regards places set forth in Article 261, when using an electric machine and appliances at the place where flammable dust (excluding deflagration dust such as the dusts of magnesium and aluminum) is liable to reach the explosible concentration even after the measures set forth in the same Article have been taken, not use electric machine and appliance unless those are of an explosion-proof structure having an explosion-proof capacity for such dust.
- (2) A worker shall not use electric machine and appliance other than the explosion-proof types set forth in the preceding paragraph at places set forth in the same paragraph.
Article 282
- (1) The employer shall, when using electric machine and appliance at places where is liable to cause danger of an explosion due to existing deflagrative dust, not use electric machine and appliance unless those are of an explosion-proof structure having an explosion-proof capacity for such dust.
- (2) A worker shall not use electric machine and appliance other than the explosion-proof types set forth in the preceding paragraph at places set forth in the same paragraph.
Article 283 (Exemptions for Repairing Work, etc.)
- (1) The provisions of the preceding four Articles shall not apply to the case of carrying out the temporary work such as repairing or altering, and when taking measures, which is unlikely to cause dangers of an explosion or fire.
Article 284 (Checkup)
- (1) The employer shall, when using an explosion-proof type electric machine and appliance set forth in Article 280 to 282 (limited to movable or portable ones) pursuant to the provision of the said each Article, check the said explosion-proof type electric machine and appliance and a movable electric cable connected with the said machine, and the condition of the connecting portion of the said machine and appliance and the said conductor before starting the use for the day, and immediately repair it when having found any abnormalities.
Article 285 (Welding, etc., of Piping or a Vessel with Residual Oil, etc.)
- (1) The employer shall, as regards piping or a tank, a drum or other vessels in which inflammable oils or combustible dusts other than dangerous substances, or dangerous substances, are liable to exist, not allow a worker to carry out welding, cutting or other works using fire, or works that is liable to produce sparks unless otherwise measures have been taken in advance, to prevent explosions or fires, such as removing, etc., such inflammable oil or combustible dust other than dangerous substances, or dangerous substances.
- (2) A worker shall not carry out the work set forth in the preceding paragraph until otherwise having taken the measures set forth in the same paragraph.
Article 286 (Welding, etc., at Places Where Ventilation, etc., Is Insufficient)
- (1) The employer shall, when carrying out the work welding, cutting, heating of metal or other using fire, or dry grinding using grinding wheels, chipping using a chisel or other work that is liable to produce sparks, at a place where ventilation is insufficient, not use oxygen for the purpose of ventilation.
- (2) A worker shall not use oxygen for the purpose of ventilation in the case prescribed in the preceding paragraph.
Article 286-2 (Anti-Static Work Clothing, etc.)
- (1) The employer shall, when carrying out the work at the locations set forth in Article 280 and 281 and the places set forth in Article 282, take measures to eliminate static electricity from the bodies and work clothing, etc, of a worker, such as ensuring that the worker engaging in the said work wear anti-static work clothing and anti-static shoes.
- (2) A worker shall, when carrying out the work set forth in the preceding paragraph, not carry out the said work without conforming to the provisions prescribed in the same paragraph.
- (3) The provisions of the two preceding paragraphs shall not apply to the case of carrying out the temporary work such as repairing and altering, and when taking measures, which is unlikely to cause dangers of an explosion or fire.
Article 287 (Removal of Static Electricity)
- (1) The employer shall, in the case where using the following equipment, and when it is liable to cause an explosion or fire due to static electricity, use a grounding, neutralizer, increase humidity, use a neutralization apparatus , which is unlikely to cause an ignition source, and take other measures for eliminating static electricity:
- (i) The equipment for pouring dangerous substances into a tank vehicle, a tank car, a drum, etc.
- (ii) The equipment for storing dangerous substances, such as tank vehicles, tank cars, drums, etc.
- (iii) The equipment for applying paints, adhesives, etc., containing inflammable substances.
- (iv) Industrial dryers (drying rooms and dryers for heat-drying with a heat source substance other than gunpowder prescribed by paragraph (1) of Article 2 of the Explosive Control Act (Act No.149 of 1950); the same shall apply hereinafter) which heat-dries dangerous substances or materials to be dried that produce dangerous substances (hereinafter referred to as “industrial dryers for dangerous substances”), or their attached facilities.
- (v) The equipment for spouting, sifting, etc., combustible powder-like substances.
- (vi) In addition to the facilities listed in the preceding each item, chemical facilities (excluding piping) or their attached facilities.
Article 288 (Prohibition of Entry, etc.)
- (1) The employer shall provide an appropriate indication that use of fire is prohibited at places where there is the danger of fire or explosion, and shall prohibit persons other than those concerned from entering an especially dangerous place.
Article 289 (Fire Extinguishing Equipment)
- (1) The employer shall provide buildings, places where chemical facilities (excluding piping) or industrial dryers are installed, and places where dangerous substances, inflammable oils other than dangerous substances, or other substances that is liable to cause an explosion or fire are handled (hereinafter referred to as “buildings, etc.” in this Article) with fire extinguishing equipment at appropriate locations.
- (2) The fire extinguishing equipment set forth in the preceding paragraph shall have the capacity corresponding to the nature of explosions or fires expected from the scale or floor space of buildings, etc., type of substances handled in the buildings, etc., and other factors.
Article 290 (Fire Prevention Measures)
- (1) The employer shall provide a distance necessary for fire protection between a furnace, heating device, iron stack or other equipment that is liable to cause danger of a fire, and a building or other flammable objects, or shall protect the said flammable objects by insulating materials.
Article 291 (Fire Prevention at Places Where Fire is Used)
- (1) The employer shall provide smoking rooms and places where stoves or other things causing fire are used with equipment necessary to prevent fires.
- (2) A worker shall not perform such as smoke, warmat the fire, and dry without reason.
- (3) A person who uses a fire shall ensure that the fire has been completely extinguished after use.
Article 292 (Ash-Dumping Spot)
- (1) The employer shall install an ash-dumping spot at places where there is no possibility of fire spreading, or shall construct the said spot with incombustible materials.
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