UL 2231-2:2012 free download

UL 2231-2:2012 free download Personnel Protection Systems for Electric Vehicle (EV) Supply Circuits: Particular Requirements for Protection Devices for Use in Charging Systems
1 Scope
1.1 This Standard is intended to be read together with Annex A, Ref. No.1.The requirements of AnnexA,Ref. No.1 apply unless modified by this Standard.
2 General
2.1 This Part contains the construction and performance requirements that are applied to a device that isintended to become an integral part of an overall device or charging system.
2.2 Annex A，Ref. No. 1 contains an outline of the features required to provide protection based onvoltage and grounding or isolation of the system or part of the system under consideration.
3 Components
3.1 Except as indicated in 3.2, a component of a product covered by this standard shall comply with therequirements for that component.
3.2 A component is not required to comply with a specific requirement that:
a) Involves a feature or characteristic not required in the application of the component in theproduct covered by this standard, or
b) ls superseded by a requirement in this standard.
3.3 A component shall be used in accordance with its rating established for the intended conditions ofuse.
3.4 Specific components are incomplete in construction features or restricted in performance capabilities.Such components are intended for use only under limited conditions, such as certain temperatures notexceeding specified limits,and shall be used only under those specific conditions.
4 Units of Measurement
4.1 The values given in Sl (metric)units shall be normative. Any other values given shall be forinformation purposes only.
5 Normative References
5.1 Where reference is made to any Standards, such reference shall be considered to refer to the latesteditions and revisions thereto available at the time of printing, unless otherwise specified.
5.2 Products covered by this standard shall comply with the referenced installation codes and standardsnoted in Annex A as appropriate for the country where the product is to be used. When the product isintended for use in more than one country, the product shall comply with the installation codes andstandards for all countries where it is intended to be used.
CONSTRUCTION
6 General
6.1 The design, workmanship, and degree of production uniformity shall be such that the reliability of thedevice to perform the functions evaluated by the requirements is high.
7 Grounding
Note: In Canada,equipment grounding conductors are referred to as bonding conductors.
7.1 A grounding circuit shall comply with Annex A, Ref. No.2 with respect to the size of the groundingconductors.
7.2 All accessible parts of a device that are likely to become energized when arc-over, insulation failure,or the similar conditions occur, shall be connected together and to the terminals intended for an equipmentgrounding conductor.
7.3 Except as described in 7.4 the equipment grounding conductor shall be sized in accordance withAnnex A,Ref. No.2.
7.4 When a charging circuit interrupting device is intended for use in a circuit where the voltage to groundis greater than 300 Vrms, the impedance of the grounding circuit shall not be higher than that value whichlimits the voltage to 150 vrms on accessible parts with respect to earth at the site of the fault during a lowimpedance fault.
7.5 The accessible parts of a device intended for use on an isolated supply with not more than 150 Vrmsbetween conductors are not required to be grounded.
7.6 ln a portable product, accessible parts that are double insulated from energized parts shall not begrounded unless the grounding path is monitored by use of a ground/monitor interrupter.