Safety training
Control of Hazardous Energies Standard / V5 10032026
Use of the term High Voltage:
Terms for low, medium and high voltage may be applied in different ways in different regions and in other working contexts, such as at the electrical distribution and transmission network levels. For example, IEC defines high voltage as a voltage which exceeds 1000 V AC or 1500 V DC., while NFPA 70E and OSHA defines on or above 600V as high voltage working. At the electrical network level, IEC defines high voltage lines as those above 36 kV (36,000 volts), while medium voltage lines are networks with a voltage between 1 and 35 kV (1,000 and 35,000 volts).
Isolation point
A specific, identified device or location on equipment which shall ensure reliable disconnection or separation from an energy source.
Low Voltage
In this GWO training standard, the term low voltage is used to refer to voltages less than those defined as high voltage. The exact voltage designation varies globally depending on where you work.
Use of voltage classifications:
IEC defines LV as voltages normally exceeding 50 V AC or 120 V DC but not exceeding 1000 V AC or 1500 V DC between conductors, or 600 V AC or 900 V DC between conductors and earth. According to the ANSI C84.1-2020: low voltage is between 240 to 600 V and medium voltage is 2.4 to 69kV.
Live known source
Energy source where you know the level of energy (e.g., as part of a circuit, socket, or a hydraulic check/test point).
Minimum arc flash PPE
Suitable PPE is required for all work based on the task risk assessment. In practice the minimum requirement is generally considered to be arc-rated, flame-resistant clothing and protective gear that protects against the heat and burn risks identified in the assessment. For supporting guidance on good working practices on minimum arc flash PPE refer to Annex 2
Pressure fluids
Compressible (e.g., nitrogen) and non-compressible (e.g., hydraulics) fluids under pressure.
Pre-task briefing
Also known as a ‘Job Briefing’ or ‘Toolbox Talk’.
Before starting each job, the person in charge of the job must conduct a briefing with the employees involved. The briefing must cover such subjects as:
hazards related to the job tasks
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work procedures involved
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special precautions
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Global Wind Organisation ©2026 / www.globalwindsafety.org
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