UL 6141 2020 pdf download – Wind Turbines Permitting Entry of Personnel.
2.3 Undated References 2.3.1 Any undated reference to a code or standard appearing in the requirements of this standard shall be interpreted as referring to the latest edition of that code or standard. 3 Glossary For the purpose of this standard, the following definitions apply. 3.1 DOWN TOWER – The space in and around a wind turbine location that is at or near ground level such as the base level of the turbine tower. 3.2 ELECTRIC POWER SYSTEM (EPS) – Equipment or facilities that deliver electric power to a load(s). The most common example of an EPS is an electric utility. 3.3 MAXIMUM CURRENT(S) – The maximum peak current(s) a wind turbine will produce. There may be several maximum current ratings defined for a product or system, such as alternator/generator output, inverter/converter output, and control output circuits. 3.4 MAXIMUM OUTPUT POWER – The maximum average power output a wind turbine in normal steady-state operation will produce over a one minute period of time. Note that the peak power output can be greater. 3.5 MAXIMUM VOLTAGE – The maximum peak voltage a wind turbine will produce during operation, including open circuit conditions. 3.6 MEDIUM VOLTAGE – More than 1000 Vac or 1500 Vdc. 3.7 NACELLE – The housing or enclosure for the alternator/generator and other wind turbine parts that is generally located at the top of the tower. 3.8 OVERVOLTAGE – Any voltage having a peak value exceeding the corresponding peak value of maximum steady-state voltage at normal operating conditions.
3.12 POLLUTION DEGREE – The level of pollution present at the location on or in a product where the clearance and creepage distance measurement is made and can be controlled by the design of the product. For example, enclosures can be used to achieve pollution degree 3, heaters within enclosures can help achieve pollution degree 2, and encapsulation can be used to achieve pollution degree 1: a) Pollution Degree 1: No pollution or only dry, nonconductive pollution. The pollution has no influence. b) Pollution Degree 2: Normally, only nonconductive pollution; however, a temporary conductivity caused by condensation may be expected. c) Pollution Degree 3: Conductive pollution or dry, nonconductive pollution that becomes conductive due to condensation that is expected. d) Pollution Degree 4: Pollution that generates persistent conductivity through conductive dust or rain and snow. 3.13 POLYMERIC MATERIAL – Materials that are either natural or synthetic and are primarily composed of chained molecules of monomers, combinations of monomers, combined polymers, crosslinking agents, fillers, colorants, and other materials. 3.14 RATED POWER – The output power of the wind turbine when operating at its rated wind speed in accordance with IEC 61400-12-1, Wind turbines – Part 12-1: Power performance measurements of electricity producing wind turbines. Note: The method for measuring wind turbine power output is specified in IEC 61400-12-1.