UL 2231-1:2002 pdf download – Personnel Protection Systems for Electric Vehicle (EV) Supply Circuits: General Requirements.
1.8 Charging circuit interrupting devces covered by these requirements are investigated for their ability to provide protection based on:
a) The type of current (60 Hz AC. DC. a combination of AC and DC, or AC at frequencies greater than 60 Hz) present In the circuit to be protected, and
b) Voltage.
1.9 These requirements do not cover ground-fault circuiNnterrupters (GFCIs) intended for use as
personnel protection in accordance with the National Electricai Code on grounded 120 Vrms to ground,
60 Hz carcuits. Such devces are covered under the Standard for Ground-Fault Circuit-Interrupters, UL
1.10 This standard includes the Scope, Glossary, and Description of Requirements, including the required leatures of protection systems. The Standard for Personnel Protection Systems for Electric Vehicle (EV) Supply Circuits: Particular Requirements for Protection Devices for Use in Charging Systems, UL 2231.2, contains the Performance and Construction requirements for protective devices that would become a part of a charging system.
2 Glossary
2.1 For the purposes of this standard, the following definitions apply.
2.2 ACCESSIBLE PART — A part so located that it is capable of being contacted by a person, either directly or by means of an accessibility probe.
2.3 AUTOMATIC RECLOSURE — The act of charging circuit interrupting device resetting itself after being tripped.
2.4 BASIC INSULATION — The insulation required for the proper functioning of a device, and for basic protection against electrical hazard.
2.5 CENTRALLY LOCATED GROUND — A system connection to ground so located that the maximum voltage to ground on all of the system conductors is minimized.
system with a grounding path impedance that is not higher than that value which limits the voltage to
150 Vrms on accessible parts with respect to earth at the site of the fault during a low-impedance
2.7 CHARGING CIRCUIT INTERRUPTING DEVICE (CCID) — A device that continuously monitors the differential current among all of the current-carrying line conductors in a grounded system and rapidly interrupts the circuit under conditions where the differential current exceeds the rated Measurement
Indication Unit (MIU) value of a charging circuit interrupting device. The device is identified by the letters CCID followed by the differential trip current rating of either 5 or 20 indicating the tripping rating in MIU. See also 5.1.
2.8 CORD-AND-PLUG CONNECTED — A device that connects to a supply circuit by way of a flexible cord terminating in an attachment plug.
2.9 DOUBLE INSULATION — A system of two independent insulations. each of which is capable of acting as the sole insulation between live and accessible parts in the event of failure of the other insulation. The insulation system resulting from a combination of basic and supplementary insulation.
3 References
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.
4 General
4.1 Basis of requirements
41.1 The requirements outlined in this standard are intended to reduce the likelihood 01 muscle tetanization (including let-go) and ventricular fibrillation
4.1.2 Insulation is the primary means to guard against the physiological effects mentioned in 4.1.1. In the event of insulation failure, which involves high or low impedance, at least one secondary protective mechanism shall be in place to address each of these effects. It is possible for a single secondary protective mechanism to address one or both of these effects. For example, it is possible for a charging circuit interrupting device to address both ventricular frillation and let-go, or only ventricular fibrillation while reliable grounding (such as monitored grounding with interruption under conditions where the grounding is lost) addresses let-go hazards. Since insulation failure is capable of being a problem from the nuisance tripping point of view, startle reaction is permitted to occur under fault conditions.
4.1.3 Available current from protective circuits shall not be capable of creating a hazardous condition. For example, the available current from a ground-monitoring circuit that cfrculates current shall not be hazardous when grounding is not intact.