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 3 Power Cut Operation
Article 339 (Measures in the Case of Power CutWork)
- (1) The employer shall, when carrying out an electric work such as installation, checkup, repairing or painting of an electrical circuit or its support while the said circuit is opened, take the following measures for the said electrical circuit after the said electrical circuit is opened. This provision shall also apply to the case of carrying out an electric work such as installation, checkup, repairing or painting of an electrical circuit or its support close to the said electrical circuit or work such as the construction, dismantlement, checkup, repairing or painting of a structure close to the said electrical circuit (excluding the support of an electrical circuit, hereinafter the same shall apply in this Chapter):
- (i) To lock the switch used for circuit opening during work, or indicate necessary matters relating to prohibition of electric charge, or place a watcher.
- (ii) As regards the opened circuit are equipped with a power cable, power capacitor, etc., and are liable to cause danger due to residual electric charge, to discharge the said residual charge completely by a safe method.
- (iii) As regards the opened circuit are in high voltage or extra-high voltage, to confirm the power cut with voltage detector, and short circuit to ground the said circuit securely with a appliance for short circuit to ground to prevent the danger of electric shocks due to erroneous turning on the electricity, confusion with other circuits or induction from other circuits.
- (2) The employer shall, when intending to turning on the opened circuit during work set forth in the preceding paragraph or when the said work is finished, not turn on the electricity unless otherwise having confirmed that it is unlikely to cause danger of electric shocks to the worker engaging the said work and the appliance for short circuit to ground has been removed.
Article 340 (Opened Circuit of Disconnector, etc.)
- (1) The employer shall, when opening a switch such as a disconnector and line switchfor high voltage or extra-high voltage electrical circuit that is not for breaking load current, in order to prevent an operational error of the said switch, have workers engaged in the said operation confirm that the said electric circuit is on no load using a pilot lamp indicating that such electric circuit is on no load, a tablet for identifying the said electrical circuit, etc. However, this shall not apply to when a locking device is provided for the said switch not to allow circuit opening unless the said electrical circuit is not load.
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