UL 98:2016 pdf free download – STANDARD FOR SAFETY Enclosed and Dead- Front Switches.
6.7.2.19 A pressure wire connector provided with or specified for use with a switch shall comply with the applicable requirements for wire connectors and soldering lugs, as outlined in Annex A, Ref. No. 6.
6.7.2.20 Switches that are marked for use with aluminum conductors shall have means for terminating aluminum grounding conductors separate from copper grounding conductors.
6.7.2.21 The tightening torque for a field-wiring terminal shall be as specified by the switch manufacturer and shall be marked as required by 9.2.57. The specified tightening torque shall not be less than 90 percent of the value employed in the static heating test as specified in the requirements in Annex A, Ref. No. 6.
6.7.2.22 A torque value of less than 90 percent shall be permitted if the connector is investigated in accordance with the requirements in Annex A, Ref. No. 6, using the lesser assigned torque value.
6.7.3 Neutral
6.7.3.1 A neutral need not be insulated from grounded metal parts when the switch is marked in accordance with 9.2.34.
6.7.3.2 A switched neutral shall be permitted only if the switch mechanism disconnects all ungrounded conductors simultaneously or previously.
6.8 Fusing
6.8.1 Fuseholders and fuse terminals shall be of either the cartridge-enclosed, plug-fuse, or special purpose fuse type and shall comply with the requirements in Annex A, Ref. No. 8, except as modified by this Standard. Fuseholders of the special purpose fuse type shall also comply with the requirements in 6.8.6.
6.8.2 The construction of a switch and the location of fuses shall be such that fuses will be readily accessible when the switch is open, so that they may be replaced without a person touching any live part. The electrical arrangement of a single-throw switch shall be such that, if properly connected, fuse terminals will be deenergized when the switch is open. See also 9.2.41 and 9.2.42.
6.8.3 A plug fuse shall be considered to be accessible if, when the switch is in the full off position, the test gauge described in 6.8.5 can be inserted and bottomed in each plug fuseholder by using the fingers of one hand and without causing a reduction in the break distance between the stationary and moving switch contacts to less than 12.7 mm (1/2 inch).
6.8.4 A neutral need not be insulated from grounded metal parts when the switch is marked in accordance with 9.2.34.
6.8.5 The test gauge mentioned in 6.8.3 shall be in the form of a plug fuse having the dimensions specified for plug fuses and having an overall height of 44.5 mm (1-3/4 inches) and a diameter of 31.8 mm (1-1/4 inches) at the section above the male screw-shell.
6.8.6 Special purpose fuseholders may be used if evaluated for use with specific special purpose fuses, which are suitably rated for use as branch circuit, feeder, or service overcurrent protection. When used, special purpose fuseholders shall:
a) Be non-interchangeable with fuses of incompatible ratings. This requires that the fuseholder be of a design so that it will be difficult to install a fuse of any given class into a fuseholder that is designed for a current lower, or voltage higher, than that of the fuse intended for use with the fuseholder; and
b) Be marked for use with the specific special purpose fuses for which it is intended to be used.
6.9 Field conversion
6.9.1 A switch constructed to accommodate Class “H” type fuses and for field conversion to accept Class “J,”“R,”“T,” or “C” fuses shall be marked in accordance with 9.2.25 — 9.2.30 and shall comply with 6.9.2 — 6.9.12.
6.9.2 A switch shipped from the factory with complete fuseholders shall have them positioned to accept Class “H” fuses.
6.9.3 A switch intended to accept Class “J” fuses by repositioning the load base or fuseholder may have the fuseholders in the “J” fuse position when the known use is for “J” fuses.
6.9.4 A switch may be shipped by the factory without load fuse clips or without the complete load fuse base.