UL Standard for Safety Electric Motor-Operated Hand-Held Tools@ Transportable Tools And Lawn And Garden Machinery – Safety – Part 1: General Requirements (COMMENTS DUE: August 11@ 2017)
This annex applies to rechargeable BATTERY-powered motor-operated or magnetically driven ?C HAND-HELD TOOLS (IEC 62841-2); ?C TRANSPORTABLE TOOLS (IEC 62841-3); ?C LAWN AND GARDEN MACHINERY (IEC 62841-4); and the BATTERY packs for such tools or machinery. The above listed categories are hereinafter referred to as ??ols??r ??chines??The maximum RATED VOLTAGE for tools and BATTERY packs is 75 V d.c. BATTERY tools covered by this annex are not considered to be CLASS I TOOLS@ CLASS II TOOLS@ or CLASS III TOOLS and therefore are not required to have basic@ SUPPLEMENTARY INSULATION or REINFORCED INSULATION. Electric shock hazard is considered to exist only between parts of opposite polarity. BATTERY packs for tools covered under this annex intended to be charged by a non-isolated CHARGER shall be evaluated by this annex and standard. When evaluating a BATTERY pack for protection against electric shock@ CREEPAGE DISTANCES@ CLEARANCES and distances through insulation@ the BATTERY pack shall be fitted to the intended CHARGER. Since BATTERY packs for power tools are submitted to different use patterns (such as rough use@ high charging and discharging currents) their safety can be evaluated only by this annex and not by using other standards for BATTERY packs@ such as IEC 62133@ unless otherwise indicated in this annex. All relevant requirements of IEC 62133 are addressed in this annex. When evaluating the risk of FIRE associated with DETACHABLE BATTERY PACKS@ consideration has been given to the fact that these BATTERY packs are unattended energy sources and have been evaluated as such in this standard. Requirements in other standards regarding the risk of FIRE due to the charging of these DETACHABLE BATTERY PACKS are therefore considered to be fulfilled. This annex also addresses requirements covering the use of lithium-ion CELLS employed in BATTERY SYSTEMS in tools. The following is considered within the context of these requirements: ?C These requirements address the risk of FIRE or EXPLOSION of these BATTERIES and not any possible hazards associated with toxicity nor potential hazards associated with transportation or disposal. NOTE 1 IEC 62281 covers the safety aspects of lithium-ion batteries during transport. ?C BATTERY SYSTEMS covered by these requirements are not intended to be serviced by the end user. ?C These requirements are intended to provide comprehensive evaluation of a BATTERY only if used in products covered by this standard. ?C These requirements address the safety of lithium-ion BATTERY SYSTEMS during storage and use including discharge and charge. These requirements are only considered to be supplementary requirements in regards to BATTERY CHARGER fire and electric shock. ?C These requirements refer to and require parameters supplied in reference to the CELLS that establish conditions for safe use of those CELLS. Those parameters form the basis of acceptance criteria for a number of tests contained herein. This standard does not independently evaluate the safety of CELLS. These parameters@ taken as a set@ constitute the ??ECIFIED OPERATING REGION??or a CELL. There may be several sets of SPECIFIED OPERATING REGION(S). This annex is not intended to apply to tools using GENERAL PURPOSE BATTERIES installed by the user and this annex alone will not be sufficient to ensure all hazards are considered for these products. This annex does not apply to the safety of BATTERY CHARGERS themselves. However@ this annex covers the safe functioning of lithium-ion BATTERY SYSTEMS. NOTE 2 IEC 60335-2-29 covers a variety of CHARGERS.