Random Section of GOST 12.1.013-78
2.5. During any outdoor operations as well as indoor operations in conditions where workers are exposed to the hazard of electrical shock (see Mandatory Appendix 4) manual electrical machines of classes II and III according to GOST 12.2.007.0-75 should be used. When operating electrical machines of class II, personal protection equipment should be used.
In case of operations in conditions where workers are exposed to extreme electrical shock hazards (see Mandatory Appendix 4) only electrical machines of class III according to GOST 12.2.007.0-75 should be used along with dielectric gloves, rubbers and insulating mats.
2.6. Portable receivers of electric power (electrotechnical device) of class I according to GOST 12.2.007.0-75 should have a cable for connection to the power source. The cable should be fitted with a grounding conductor and a socket connector with the grounding terminal ensuring advance closing upon energizing and delayed tripping upon de-energizing.
2.7. Metal scaffolding, rail tracks of electric lifting cranes and other metal parts of electrically driven building machines and equipment should have protective grounding (grounding of the neutral wire).
In electrical equipment with the voltage of up to 1,000V with dead-earthed neutral or terminal of a single-phase current source, grounding of cases of electric power receivers (electrotechnical equipment) shall not be allowed without their earthing their neutral line.
2.8. Design of circuit breakers, knife-switches and other switching electrical devices used at the construction site or installed on the industrial construction equipment and machines should include safety guards.
2.9. Current-carrying parts of electrical equipment should be insulated, enclosed or located in places inaccessible for contact.
2.10. Outdoor electric wiring of the temporary power supply system should be made with insulated wire, placed on supports at a height above earth, floor, floor boarding level not less than:
2.5m – above workplaces;
3.5m – above passages-ways;
6.0m – above passages for cars.
2.11. Installation and operation of electric wiring and electrical devices should eliminate possible thermal effects of electric current which may cause the ignition of insulation or closely located combustible materials.
2.12. Protection of power networks and electrical equipment on construction sites from phase fault currents and ground fault currents should be provided by installing safety devices with calibrated fuses or automatic circuit breakers.
2.13. General lighting lamps connected to the power source (mains) with the voltage of 127V and 220V should be installed at a height of not less than 2.5m above ground, floor, or floor boarding level. Where the height of location of lighting fixtures is less than 2.5m, they should be connected to the mains with the voltage not higher than 42V.
2.14. During operation in highly hazardous conditions (see Mandatory Appendix 4), portable lamps with the voltage not higher than 12V should be used.