UL 2808-2020 pdf download – Energy Monitoring Equipment.
8.6 If provided in multiple pieces, except where it would interfere with the intended motion of a split-core bobbin, the case parts shall be reliably secured together by ultrasonic welding, solvent welding, snap-fit, glue, or other suitable means. If glue is used, it shall be rated minimum 105°C (221°F) and evaluated for adhesion with the case material. 8.7 When mounted as intended, there shall be no ventilation or other openings in the case that would allow contaminants into areas with live parts. 8.8 Flexible case materials, such as a Rogowski Coil, shall meet the insulation requirements for field wiring leads described in 10.1 and 10.3, except the exterior-most insulating material shall be rated at least 105°C (221°F). 8.9 Enclosed-type current sensors for indoor use shall meet the requirements for UL 50, Type 1. 8.10 For enclosed-type current sensors intended for outdoor use, the case shall be constructed of materials suitable for outdoor use (f1) with respect to exposure to Ultraviolet Light, Water Exposure and Immersion in accordance with UL 746C and CAN/CSA C22.2 No. 0.17. Potting material shall also be evaluated for exposure to Ultraviolet Light, Water Exposure and Immersion in accordance with UL 746C and CAN/CSA C22.2 No. 0.17. Gasket materials shall comply with the Tensile Strength and Elongation Tests, and Compression Tests of UL 50E and CSA C22.2 No. 94.2. The case shall restrict water access to interior parts. Exposed metal parts shall meet the outdoor and additional corrosion requirements for Type 6P of UL 50E and CSA C22.2 No. 94.2. 9 Spacings 9.1 Electrical spacings for an uncontrolled environment from any external surface to any internal live part shall comply with Table 9.1. Over-surface distances depend on the Comparative Tracking Index (CTI) of the insulation material. If the CTI value is not known, a CTI PLC rating of 4 is assumed.
9.4 When measuring from the coil or other live parts to the external surfaces of the current sensor, consideration shall be given to tracking along the surface of the core or other un-insulated dead metal, to any other point along the surface of the metal piece. Thus, compliance shall be determined by measuring from the live part to the metal part, and then adding the shortest distance from any point along the metal part to the external surface. 9.5 Measurements from an external surface include any exposed surface that could come into contact with live parts within the end-use installation, including where the primary conductor or busbar passes through the current sensor. 9.6 Electrical sleeving or tubing provided on the core or other metal part used to comply with spacings requirements shall be rated minimum 105°C (221°F) and minimum 300 V for current sensors marked “250 V”, minimum 600 V for current sensors marked “600 V” or minimum 1000 V for current sensors marked “1000 V”. Additionally, the sleeving shall comply with 14.4 for reduced dielectric strength values. 9.7 Tape used on the core or other metal part to comply with spacing requirements shall: a) Be applied in two or more layers; b) Not be wrapped over a sharp edge; c) Have a temperature rating no less than 105°C (221°F) minimum; and d) Be such that each layer complies with 14.4 for reduced dielectric strength values. 9.8 Insulating barriers used to comply with spacing requirements shall comply with the requirements shown for case materials, Table 8.1 or with 8.4. 9.9 Electrical spacings for a controlled environment shall comply with Table 9.3 and Table 9.4.