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 4 Live Line Work and Work Close to Live Line
Article 341 (High-Voltage Live Line Work)
- (1) The employer shall, in the case of carrying out the work handling a charged circuit of high voltage, such as checkup and repair of the said circuits, and when it is liable to cause danger of electric shocks to the worker engaging in the said work, take measure falling under any of the following each item:
- (i) To have a worker wear personal insulating protective equipment, and install an insulating device to the portions of such charged electrical circuit other than the portion handled by workers where is liable to cause danger of electric shock when workers contact or close to the portions.
- (ii) To have a worker use live line work instruments.
- (iii) To have a worker use live line work equipment. In this case, the danger of electric shocks due to the body of a worker or an electric conductor handled by workers such as a metal tool and material (hereinafter referred to as “body, etc.”) contacts or close to objects with different voltage from that of charge circuit actually handled by workers shall be eliminated.
- (2) A worker shall, in the work set forth in the preceding paragraph, when having been instructed to wear personal insulating protective equipment, install an insulating device, and use live line work instruments or live line work equipment by the employer, wear, install, or use them respectively.
Article 342 (Work Close to High-Voltage Live Lines)
- (1) The employer shall, in the case where carrying out the electric workinstalling, inspecting, repairing, painting, etc., of an electrical circuit or its supports, and when it is liable to cause danger of electric shock to the worker engaging in the said work due to contacting a high-voltage charged circuit, or approaching the said electrical circuit within 30 cm above the head or within 60 cm from the side of the body or below the feet, install an insulating device for the said charged circuit. However, this shall not apply to the case of having the worker engaging in the said work wear personal insulating protective equipment, and when it is unlikely to cause danger of electric shock to the parts of the body other than those wearing the said personal insulating protective equipment due to contact or approach the said charged electrical circuits.
- (2) A worker shall, when having been instructed to provide an insulating device or wear personal insulating protective equipment by the employer in the work set forth in the preceding paragraph, provide and wear them respectively.
Article 343 (Install of an Insulating Device, etc.)
- (1) The employer shall, when having workers carry out work installing or removing an insulating device in the case set forth in the preceding two Articles, have the worker engaging in the said work wear personal insulating protective equipment or have them use live line work instruments or live line work equipment.
- (2) A worker shall, in the work set forth in the preceding paragraph, when having been instructed to wear protective equipment or use live line work instruments or live line work equipment by the employer, wear or use them respectively.
Article 344 (Extra-High-Voltage Live Line Work)
- (1) The employer shall, in the case of carrying out electric work such as checkup, repairing and cleaning of a extra-high-voltage charged circuits or their supporting insulators, and when it is liable to cause danger of electric shock to the worker engaging in the said work, take measure falling under any of the following each item:
- (i) To have a worker use live line work instruments. In this case, for the body, etc., approach limit listed in the right column of the following table shall be maintained corresponding to the working voltage of charged circuit listed in the left column of the same table.
Working voltage of charged electric circuit (kV) Minimum allowable proximity (cm) 22 or less 20 Exceeding 22 but 33 or less 30 Exceeding 33 but 66 or less 50 Exceeding 66 but 77 or less 60 Exceeding 77 but 110 or less 90 Exceeding 110 but 154 or less 120 Exceeding 154 but 187 or less 140 Exceeding 187 but 220 or less 160 Exceeding 220 200 - (ii) To have a worker use live line work equipments. In this case, the danger of electric shocks due to the body, etc., contacts or close to a substance having an electric potential different from the electric potential of the charged electric circuit or its supporting insulators handled by workers shall be eliminated.
- (i) To have a worker use live line work instruments. In this case, for the body, etc., approach limit listed in the right column of the following table shall be maintained corresponding to the working voltage of charged circuit listed in the left column of the same table.
- (2) A worker shall, when having been instructed to use a live line work instrument or live line work equipment in the case set forth in the preceding paragraph, use it.
Article 345 (Work Close to Extra-High-Voltage Live Line)
- (1) The employer shall, in the case of carrying out electric work such as checkup, repairing, painting and cleaning of an electric circuit or its supports (excluding supporting insulators for extra-high-voltage charged circuits) , and when it is liable to cause danger of electric shock to the worker engaging in the said work due to close to a extra-high-voltage charged circuit, take measure falling under any of the following each item:
- (i) To have a worker use live line work equipment.
- (ii) To have body, etc., keep approach limit to the charged circuit as prescribed in item (i) of paragraph (1) of the preceding Article. In this case, provide a sign, etc., at a readily visible location where the minimum allowable proximity may be maintained, or to place a watcher and have the watcher watch the work .
- (2) A worker shall, in the work set forth in the preceding paragraph, when having been instructed to wear personal insulating protective equipment or use live line work equipment by the employer, wear or use them respectively.
Article 346 (Low Voltage Live Line Work)
- (1) The employer shall, in the case of carrying out work handling a low voltage charged circuit, such as checkup and repairing of the said circuit, and when it is liable to cause danger of electric shocks to the worker engaging in the said work, have the said workers wear personal insulating protective equipment or have them use live line work instruments.
- (2) A worker shall, in the work set forth in the preceding paragraph, when having been instructed to wear personal insulating protective equipment or use live line work instruments by the employer, wear, or use them respectively.
Article 347 (Operations Close to Low-Voltage Live Line)
- (1) The employer shall, in the case of carrying out electric work such as installing, checkup, repairing, and painting of an electrical circuit or its supports at a place close to a low-voltage charged electric circuit, and when it is liable to cause danger of electric shock tothe worker engaging in the said work due to contacting the said charged circuit, install an insulating device for the said charged electrical circuit. However, this shall not apply to the case of having the worker engaging in the said work wear personal insulating protective equipment, and when the parts of the body, etc., other than those wearing the said personal insulating protective equipment are unlikely to cause contacting the said charged electrical circuit.
- (2) The employer shall, in the case described in the preceding paragraph, and when having workers carry out work installing or removing an insulating device, have the worker engaging in the said work wear personal insulating protective equipment or have them use live line work instruments.
- (3) A worker shall, in the work set forth in the preceding two paragraphs, and when having been instructed to install an insulating device, wear personal insulating protective equipment, or use live line work instruments by the employer, install, wear, or use them respectively.
Article 348 (Personal Insulating Protective Equipment, etc.)
- (1) The employer shall, as regards personal insulating protective equipment, etc., listed in following each item, use those of the type, materials and size suitable for the purpose of use respectively:
- (i) The personal insulating protective equipment set forth in Article 341 to 343.
- (ii) The insulating device set forth in Article 341 to 342.
- (iii) The live line work equipment set forth in Article 341 and 343 to 345.
- (iv) The live line work instruments set forth in Article 341, 343 and 344.
- (v) The personal insulating protective equipment and the live line work instruments set forth in Article 346 and 347 and an insulating device set forth in Article 347.
- (2) The employer shall, as regards personal insulating protective equipment, live line work instruments and an insulating device listed in item (v) of the preceding paragraph, which are used for a charged circuit of 750 V or less for direct current or of 300 V for alternative current or less, use those having an insulating effect corresponding to the voltage of the said charged circuit.
Article 349 (Prevention of Electric Shocks in the Case of the Work for the Construction of Structures, etc.)
- (1) The employer shall, in the case where carrying out the works such as constructing, dismantling, checkup, repairing,and painting of a structure or the work associated with them, or the work using a pile driver, pile drawer, mobile crane, etc., at a place close to overhead wires or charged circuits of electric machine and appliance, and when it is liable to cause danger of electric shocks to the worker engaging in the said works due to the workers' body, etc., contact or close to the said charged circuits during work or passage, take measure falling under any of the following each item:
- (i) To move the said charged circuits to other places.
- (ii) To install an enclosure to prevent the danger of electric shock.
- (iii) To provide the charged circuits with personal insulating protective equipment.
- (iv) When taking measures falling under the preceding three items are extremely difficult, place a watcher and have the said watcher oversee the work.
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