UL 50:2020 pdf download.Enclosures for Electrical Equipment,Non-Environmental Considerations.
6 Construction
6.1 General
6.1.1 An enclosure shall completely enclose all live parts that may be housed in it.
6.1.2 All enclosures, other man those designed to be tree standing or those designed for a specific installation, such as a cast-metal box intended to be installed in poured concrete, shall be provided with means for mounting.
6.1.3 Any part that is not required in order to comply with the requirements in this standard and does not serve to maintain the mechanical, electrical, or environmental integrity of the enclosure need not comply with the requirements of This standard
6.1.4 An enclosure, frame, or similar device shall not have accessible edges that are sharp or pointed such that they constitute a risk of injury to persons during normal installation, maintenance, and use, unless:
a) Accessible edges are protected by guards or the use of handles to minimize access to sharp edges or points, or
b) An accessible edge or portion of an accessible edge is required to be sharp in order to perform a working function, or
C) lit is possible to avoid the hazard through proper procedures, then signs. labels or the manulacturers instructions shall describe the procedure to avoid the hazard during installation, maintenance, and use
When considering sharp edges and points, all stages of the installation process shall be considered.
6.1.5 Whenever referee measurements are necessary to determine that a part as mentioned in Clause J_4 is not sufficiently sharp to constitute a risk of injury to persons, the method described in Annex B Ref. No, 9, shall apply. In Canada. Clause shall not apply.
6.1.6 An enclosure shall have the necessary strength and rigidity to maintain its shape so that doors will close tightly.
6.1 General
6.1.1 An enclosure shall completely enclose all live parts that may be housed in it.
6.1.2 All enclosures, other man those designed to be tree standing or those designed for a specific installation, such as a cast-metal box intended to be installed in poured concrete, shall be provided with means for mounting.
6.1.3 Any part that is not required in order to comply with the requirements in this standard and does not serve to maintain the mechanical, electrical, or environmental integrity of the enclosure need not comply with the requirements of This standard
6.1.4 An enclosure, frame, or similar device shall not have accessible edges that are sharp or pointed such that they constitute a risk of injury to persons during normal installation, maintenance, and use, unless:
a) Accessible edges are protected by guards or the use of handles to minimize access to sharp edges or points, or
b) An accessible edge or portion of an accessible edge is required to be sharp in order to perform a working function, or
C) lit is possible to avoid the hazard through proper procedures, then signs. labels or the manulacturers instructions shall describe the procedure to avoid the hazard during installation, maintenance, and use
When considering sharp edges and points, all stages of the installation process shall be considered.
6.1.5 Whenever referee measurements are necessary to determine that a part as mentioned in Clause J_4 is not sufficiently sharp to constitute a risk of injury to persons, the method described in Annex B Ref. No, 9, shall apply. In Canada. Clause shall not apply.
6.1.6 An enclosure shall have the necessary strength and rigidity to maintain its shape so that doors will close tightly.
