- Hot search：
UL 621-2019 pdf free download
UL 621-2019 pdf free download.Ice Cream Makers.
Exception: The operating handle of a circuit breaker, the reset button of a manually resettable motor protector the reset button of a manually resetlable pressure switch, and similar parts may project outside the enclosure.
8.2.6 An opening in an outer enclosure around a handle, reset button, or other control member is acceptable if the clearance between the control member and the edge of the opening is not more than 1/8 inch (3.2 mm) for any setting or position of the control member
8.2.7 Covers for enclosures of fuses in high-voltage circuits shall be hinged. Covers for manual-reset overload protective device enclosures shall be hinged if it is necessary to open the cover to reset the device.
Exception: A hinged cover is not required where the only fuses enclosed are:
a) Supplementaiy type control circuit fuses. provided that the fuses and control circuit loads (other than a fixed control circuit load such as a pilot lamp) are within the same enclosure: or
b) Supplementary type fuses of 2 amperes or less for small auxiliary resistance heaters, such as crankcase heaters, with a maximum rating of 100 watts: or
c) An extractor-type fuse with its own enclosure; or
d) Fuses in low-voltage circuits.
8.2.8 Hinged covers, where required. shall not depend solely upon screws or other similar means to hold them dosed, but shall be provided with a latch or the equivalent.
8,2.9 A spring latch, magnetic latch, dimple, or any other mechanical arrangement that will hold the door in place and will require some effort on the user’s part to open it is acceptable for holding the door in place as required in L2. When provided as the sote means for securing the cover or panel, a cover interlocking mechanism as described in .&2.2 is considered to comply with the requirements of2.
8.2.10 A door or cover giving direct access to fuses in other than low-voltage circuits shall shut closely against a 1/4-inch (6.4-mm) rabbet or shall have either turned flanges for the full length of four edges or angle strips fastened to it. Flanges or angle strips shaft fit closely with the outside of the wall of the box and shall overlap the edges of the box not less than 1/2 inch (12.7 mm). A special construction, such as a fuse enclosure, located within an outer endosure. or a flange and rabbet combinabon that affords the equivalent protection is acceptable
8.2.11 Strips used to provide rabbets. or angle strips fastened to the edges of a door, shall be secured at not less than two points, not more than 1-1/2 inches (38.1 mm) from each end of each strip and at points between these end fastenings not more than 6 inches (152 mm) apart.UL 621-2019 pdf free download.
All resources on this website are from the Internet. It is only for personal study and research. No one is allowed to use it for any commercial purpose. If you need, please buy the genuine standard. If there is any infringement of your copyright, please contact the webmaster in time, and I will correct it immediately.
- Maybe you like
- Latest Updates
- ISO 287-2009 pdf free download
- ISO 527-5-2009 pdf free download
- ISO 659-2009 pdf free download
- ISO 660-2009 pdf free download
- ISO 712-2009 pdf free download
- ISO 725-2009 pdf free download
- ISO 730-2009 pdf free download
- ISO 927-2009 pdf free download
- ISO 2041-2009 pdf free download
- ISO 3040-2009 pdf free download
- ISO 3506-2-2009 pdf free download
- ISO 3506-3-2009 pdf free download