UL 2231-1-2016 pdf download
UL 2231-1-2016 pdf download.Personnel Protection Systems for Electric Vehicle (EV) Supply Circuits : General Requirements.
2,16 MUSCULAR TETANIZATION — A physiological effect that involves the continuous tonic spasm of
a muscle produced by an external stimulus, such as electric current through the body. Muscular
tetanization conssts of a number of effects of concern Including let-go, immobilization, and respiratory
arrest.
2.16A PROGRAMMABLE COMPONENT — Programmable components include monolithic, hybrid, or module circuits, where the internal circuit connections are not accessible exclusive of provided external connection pins or pads. The circuits are capable of functioning in the analogue mode. digital mode, or a combination of the two modes. This includes any microelectronic rcuit such as a microprocessor, ASIC, ROM, RAM, PROM. EPROM, PAL and PLO that can be programmed in the design center, the factory, or in the field. Here the term programmable” is taken to be any manner in which one can alter the software or other logic wherein the behavior of the component can be altered.
2.17 REINFORCED INSULATION — An insulation, equivalent to double insulation, that provides protection against electrical shock hazard.
2.18 STARTLE REACTION — A physiological effect that invokes involuntary muscular reaction which can cause injury from the uncontrolled movement of the body. Startle reaction is caused by the onset and Interruption, or sudden change, of current.
2.19 SUPPLEMENTARY INSULATION – An independent insulation provided in addition to the basic insulation to protect against electric shock hazard In the event that functional Insulation fails.
2.20 TRIP — Automatic interruption by the CCID of the electric circuit to the load.
2,21 VENTRICULAR FIBRILLATION — A physiological effect that causes a disorganized, arrhythmic motion of the heart, rendering it unable to pump blood.
3 Normative References
3.1 Where reference is made to any Standards, such reference shall be considered to refer to the latest editions and revisions thereto available at the time of printing, unless otherwise specdied.
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 f or a charging circuit-interrupting device to address both ventricular fibrillation 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 circulates current shall not be hazardous when grounding is not intact.
42 ApplicatIon of requirements
4.2.1 Protective Systems. Section 6. refers to parts of the charging system, one part at a time, that are capable of being contacted by a person. It is possible that several protective mechanisms will be required to be used simultaneously, in various combinations, on a single charging system to provide protection. At each part, a determination shall be made regarding whether the secondary protective mechanism is capable of sensing a condition, such as loss of grounding, loss of isolation, a ground-fault, or similar condition, which results in an increased risk of injury to persons, and also whether the secondary protective mechanism remains de-energized or interrupts the appropriate circuitry.
