IEC 62841-3-12-2021 pdf free download – Electric motor-operated hand-held tools, transportable tools and lawn and garden machinery – Safety – Part 3-12: Particular requirements for transportable threading machines.
19 Mechanical hazards
This clause of Part 1 is applicable, except as follows:19.1Replacement of the first paragraph:
Moving and dangerous parts other than the chuck(s), cutting head or workpiece shall be sopositioned or enclosed to provide adequate protection against personal injury.
19.6 This subclause is not applicable.
19.8 This subclause is applicable for threading machines, if provided with:- wheels; or
-a cart with wheels.19.101 Run-down
The run-down of the tool spindle after switching off the motor shall be limited.Compliance is checked by the following test，which is performed ten times.
The tool motor is switched on under no-load for a minimum of 30 s, then switched off.Foreach test,the run-down of the spindle shall not exceed two revolutions.
20 Mechanical strength
This clause of Part 1 is applicable, except as follows:20.5 This subclause is not applicable.
21 construction
This clause of Part 1 is applicable, except as follows:
21.17Replacement:
Threading machines shall be fitted with a power switch which is not a momentary powerswitch. The actuating member of this switch shall be easily visible and accessible from theoperator’s position designated in 8.14.2 b) 101,.
The machine shall also be fitted with a foot switch which is a momentary power switchwithout a lock-on device.
lt shall be necessary that both the power switch and the foot switch are in the “on” position inorder to operate the machine.
Compliance is checked by inspection.
21.18.2.1Addition:
After voltage recovery, following an interruption of the supply, the tool shall not automaticallyrestart. The foot switch as required in 21.17 is regarded as a momentary power switch.
21.18.2.3Replacement:
The foot switch required in 21.17 shall be shielded so that unintentional movement to the “on”position is unlikely and the shield shall have sufficient strength.
Compliance is checked by the test of 20.3.2 and by the following test.
With the foot switch placed on a horizontal surface, it shall not be possible to activate the footswitch with a 12 mm diameter rod held perpendicular to the horizontal surface and applied ina perpendicular motion with a force of 50 N.
21.30 This subclause is not applicable.
21.35 This subclause of Part 1 is not applicable.
22 Internal wiring
This clause of Part 1 is applicable.
23 components
This clause of Part 1 is applicable, except as follows:
23.1.10Aadition;
Alternatively, foot switches, if separately tested and found to comply with lEC 60947-5-1, shallmeet the rating and endurance requirements specified in 23.1.10.1.
23.2Replacement of the first dash:
– switches or automatic controls in flexible cords,however the foot switch required in 21.17and protective devices such as RCDs may be fitted in flexible cords;
23.3 This subclause of Part 1 is not applicable.
24 Supply connection and external flexible cords
This clause of Part 1 is applicable, except as follows:24.4Additior:
lf rubber insulated cables are used,they shall be polychloroprene or other equivalentsynthetic elastomer sheathed cables (code designation 60245 IEC 57 or 60245 IEC 66).
NOTE101 ln the United States of America,the following conditions apply-
Supply cords shall be not lighter than Junior Hard service ($.0) cord in accordance with the National ElectricalCode, NFPA 70.
Attachment plugs and cords shall be equal to or greater than the rating of the toal.NOTE102ln Canada, the following cond itions apply:
Supply cords shall be not lighter than Hard Usage cord (SJO) in accordance with the Canadian Electrical Code,Part 1.
Attachment plugs and cords shall be equal to or greater than the rating of the tool.IEC 62841-3-12 pdf download.