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 V Prevention of Dangers Due to Electricity
Section 1 Electric Machine and Appliance
Article 329 (Enclosure, etc., for Electric Machine and Appliance)
- (1) The employer shall, as regards live parts of electric machine and appliance (excluding the portions of electric machine and appliance which are inevitable to be exposed for the purpose of their use such as heating unit of electric heaters, the welding rods of resistance welding machines) which is liable to cause danger of electric shocks to workers when they contact (including contact via an electric conductor; hereinafter the same shall apply in this Chapter) or come in proximity to these parts during work or passage, install enclosures or insulating covers in order to prevent electric shocks. However, this shall not apply to the electric machine and appliance which are installed in an enclosed place such as a switchboard room and substation room where the employer prohibited persons other than those who are engaged in the work set forth in item (iv) of Article 36 (hereinafter referred to as “electrician”) from entering, or installed on detached place such as a pole and a tower where there is no possibility that persons other than electrician will come in proximity to them.
Article 330 (Guard for a Portable Lamp, etc.)
- (1) The employer shall install a guard for portable lamps connected with movable electric wire, suspended lamps, etc., connected with makeshift installed wiring or movable electric wire, in order to prevent the danger of electric shocks by contacting the bayonet cap, and the danger due to broken electric bulbs.
- (2) The employer shall conform the guard set forth in the preceding paragraph to the following provisions:
- (i) To have the structure that prevents hands from easily contacting the exposed portion of the bayonet cap of the electric bulbs.
- (ii) To be made of the materials which are not easily broken or deformed.
Article 331 (Holders for Welding Rod, etc.)
- (1) The employer shall, as regards holders for welding rod, etc., used in work such as arc welding, etc. (excluding automatic welding), not use them unless those which conform to the standards described in the Japanese Industrial Standard C 9302 (Welding rod Holders), or those which have same insulating effect or heat resistance as this Standard or better.
Article 332 (Automatic Voltage Reducing Device for A.C. Welding Machines)
- (1) The employer shall, when carrying out alternative current arc welding, etc. (excluding automatic welding) at places surrounded by electric conductors which are very small in space, such as inside of a double-bottom or peak tank of a vessel, of a drum or dome of a boiler, or at the place in height of 2 m or higher where it is liable to cause dangers to workers due to fall and that is liable to workers contact grounding materials with high conductivity of steel frame, etc., use an automatic voltage reducing device for alternative current arc welding machines.
Article 333 (Prevention of Electric Shocks Due to Leakage of Electricity)
- (1) The employer shall, as regards machines or appliance equipped with motor (hereinafter referred to as “motor-driven appliance”) which are of the movable or portable type, those have voltage to ground exceeding 150 V , or those used at places where they are wetted with liquids having high electric conductivity such as water, or at places where electric conductivity is high, such as on an iron plate, a steel frame, or a surface plate, connect an earth-leakage circuit breaker for preventing electric shocks that conforming the rating of the said circuit, and having good sensitivity and the function to reliably work in order to prevent danger of electric shocks due to the leakage of electricity to the electric circuit to which motor-driven appliance are connected.
- (2) The employer shall, when it is difficult to take the measures prescribed by the preceding paragraph, use by grounding the metal portions of the outer frame of motor-driven appliance , metal covers of motors, prescribed as follows:
- (i) To connect the said metal portions to a grounding pole by any of the following method:
- (a) The connecting method to a grounding pole by using a movable cable with a core exclusively used for a grounding line and a connecting device with terminal exclusively used for a grounding terminal.
- (b) The method connecting a grounding line attached to a movable electric cable and the grounding terminal installed at the location adjacent to a power source consent of a motor-driven apparatus.
- (ii) When the method set forth in (a) of the preceding item is to used, take measures to prevent confusing the grounding conductor and an electric conductor connected to the electrical circuit, and the grounding terminal and a terminal connected to the electrical circuit.
- (iii) To securely connect the grounding pole with the ground by the method such as burying it in the ground to a sufficient depth.
- (i) To connect the said metal portions to a grounding pole by any of the following method:
Article 334 (Exemptions)
- (1) The provisions of the preceding Article shall not apply to motor-driven appliance, which falling under any of the following each item:
- (i) Motor-driven appliance use by connecting with an electrical circuit of a non-grounding system (limited to those for which the secondary voltage of the insulated transformer provided in the circuit on the power source side of the motor-driven appliance is 300 V or less, and which the electrical circuit on the load side of the insulated transformer is not grounded).
- (ii) Motor-driven appliance used on an insulating platform.
- (iii) Motor-driven appliance of a double insulation structure attached the indication set forth in the paragraph (1) of Article 10 of the Electric Appliances Materials Act (Act No.234 of 1961) of specified electric appliances set forth in the same Act.
Article 335 (Illumination over the Operation Portions of Electric Machine and Appliance)
- (1) The employer shall, when operating electric machine and appliance, maintain necessary illumination over the operation portions of the said electric machine and appliance in order to prevent dangers of electric shocks or dangers due to an operational error.
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