UL-6141:2016 pdf free download – STANDARD FOR SAFETY Wind Turbines Permitting Entry of Personnel.
4.2.6.3 International color system
4.2.6.3.1 Colors are coded as follows:
a) Green-yellow combination — protective conductor;
b) Light blue — neutral conductor;
c) Black — all ac and dc power circuits;
d) Red — all ac control circuits;
e) Dark blue — all dc control circuits;
f) Orange — all control and power circuits that remain energized when the main disconnect(s) is in the “off” position.
4.3 Splices and connections in power cables
4.3.1 Splices in power circuit cables shall be provided with insulation suitable for the circuit in which it is used, including voltage rating, thermal rating, and mechanical protection.
4.3.2 Conductor splices shall be rated for the size, type, and number of conductors to which they are connected.
4.3.3 For connections or splices that do not include a strain relief, a strain relief shall be provided within
24 inches of the spliced connection to prevent tensile forces on the conductors and splice.
4.3.4 Spliced connections in WT power circuits operating at 1000V or less shall be assembled in accordance with the splice manufacturer’s instructions using the tool specified by the splice connector manufacturer. The tool shall be calibrated per the manufacturer’s specifications. The assembly operation shall be performed within the rated installation ambient temperature range as specified by the connector manufacturer.
4.3.5 For splice connections in power circuits operating at 1000V or less, the finished assembly shall comply with the applicable testing requirements of the Standard for Wire Connectors, UL 486A-486B, regardless of the applied voltage. Splice connections operating between 600V and 1000V, shall be subjected to the insulation puncture tests at a test voltage of 2000V plus 2.25 times circuit operation voltage. The flashover tests shall be conducted in accordance with insulation puncture and flashover test voltages, Tests A and B (Table 28) of UL 486A-486B, for 600 and 1000 volts. The testing shall be performed using the same conductor type and style in the WT application.
4.3.6 Splice connectors used in power circuits above 1000V shall comply with the requirements of IEEE 404, Standard for Extruded and Laminated Dielectric Shielded Cable Joints Rated 2.5 kV to 500 kV.
4.3.7 Termination connectors used in power circuits above 1000V shall comply with the requirements of:
a) IEEE 48, Standard for Test Procedures and Requirements for Alternating-Current Cable
Terminations Used on Shielded Cables Having Laminated Insulation Rated 2.5 kV through 765
kV or Extruded Insulation Rated 2.5 kV through 500 kV, for high stress control terminations, or
b) IEEE 386, Standard for Separable Insulated Connector Systems for Power Distribution Systems Above 600 V, for equipment connections such as switchgear.
4.4 Cable twist loop
4.4.1 If operation of the wind turbine results in the potential twisting of cables — connecting cables between rotating parts (nacelle) and parts of the fixed structure (tower or foundation) — the operational conditions of use shall not cause damage to the conductors or their insulation.
4.4.2 Cables shall be used within the ratings stated by the cable manufacturer for rotation and temperature.
4.4.3 The cable manufacturer’s ratings for torsion characteristics shall be used as a basis for determining the acceptability of the cable in the specific application. Where the cable manufacturer cannot provide these ratings, a sample that is deemed representative of the conditions to which the cable will be subjected in the specific application shall be tested.
4.4.4 Controls that prevent damage to conductors or their insulation, including rotational limits, shall be considered part of the Safety Related Controls System evaluation of this document. The control shall be designed so that resetting to the neutral position is possible. See Section 8, Safety Related Controls System (SRCS).