UL 6141 2020 pdf download – Wind Turbines Permitting Entry of Personnel.
3.11 POLLUTION – Any addition of contaminants, solid, liquid or gaseous (ionized gases), and moisture that may produce a reduction of dielectric strength or surface resistivity. 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. 3.15 SAFETY RELATED CONTROLS SYSTEM (SRCS) – Assembly of equipment that includes the critical controls and protection functions that maintain the wind turbine within its mechanical and structural design limitations. This includes the evaluation of electrical control and protection functions, limits, operation, and response times during normal, abnormal, and failure conditions.
4 Special Components and Subassemblies of Wind Turbines 4.1 General 4.1.1 For the purpose of this standard, the medium voltage requirements are to be applied to circuits that operate at greater than 1000Vac / 1500 Vdc nominal. 4.1.2 WT equipment and subassemblies, other than those noted in this section and 2.1, Components, shall comply with (at minimum) one of the following standards: a) The Standard for Industrial Control Panels, UL 508A; b) The Standard for Adjustable Speed Electrical Power Drive Systems – Part 5-1: Safety Requirements – Electrical, Thermal and Energy, UL 61800-5-1, or c) UL 60947 Low-Voltage Switchgear and Controlgear – Part 1: General Rules along with any of the following UL 60947 part 2 standards: 1) UL 60947-4-1, Low-Voltage Switchgear and Controlgear – Part 4-1: Contactors and Motor-Starters – Electromechanical Contactors and Motor-Starters; 2) UL 60947-4-2, Low-Voltage Switchgear and Controlgear – Part 4-2: AC Semiconductor Motor Controllers and Starters l Contactors and Motor-Starters;