Operations training
High Voltage Standard / V1 02072025
Circuit-breaker
A mechanical switching device, capable of making, carrying, and breaking currents under normal circuit conditions and also, making and carrying for a specified time and breaking currents under specified abnormal circuit conditions such as those of short circuit.
Deranged equipment
Equipment that is suspected to be damaged and must be treated with more caution than equipment in its normal condition.
For the purposes of the GWO HV standard, the term High Voltage is used for voltages normally exceeding low voltage. The exact voltage designation varies globally depending on where you work.
High Voltage
Use of the term High Voltage in the GWO HV standard:
Terms for low, medium and high voltage may be applied in different ways in different geographies 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). For the purposes of the GWO HV Cable Pulling module, the term ‘HV Cable’ refers primarily to the main WTG tower cable carrying power from the point of termination in the nacelle equipment to the point of termination at equipment within the base of the tower. In the workplace, this may also be referred to as a medium voltage (MV) cable. The cable breakout referred to within the training relates to the breakout of this cable, found at the termination point in the top of the WTG tower at the nacelle equipment. See: Breakout . Human factors are an established science that uses many disciplines (like anatomy, physiology, physics, and biomechanics) to understand how people perform under different circumstances. For the purposes of the GWO HV 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.
High Voltage Cable
Human factors
Low voltage
Use of voltage classifications in the GWO HV standard:
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.
Global Wind Organisation / www.globalwindsafety.org
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