UL-363:2015 pdf free download – STANDARD FOR SAFETY Knife Switches.
8.8 Rivets shall not be used as hinge pins for a switch rated at more than 100 A.
8.9 Rivets may be used as hinge pins for a switch rated at 100 A or less. If tubular rivets are employed, the metal of the rivet shall not be less than 0.025 inch (0.64 mm) thick.
8.10 The crossbar of a multi-pole switch shall be secured to each blade to prevent turning or twisting.
8.11 A crossbar less than 3 inches (76.2 mm) in length shall be made of insulating material. If a crossbar
3 inches or more in length is made of metal to provide greater mechanical strength, the metal shall be
insulated from the blades and separated from the break jaws to the extent that arcing does not occur from
the break jaws to the crossbar when the switch is opened under overload conditions. See Overload Test, Section 14.
8.12 Vulcanized fiber, impregnated hard wood, and phenolic or cold-molded composition are acceptable as materials for crossbars.
9 Wiring Terminals
9.1 A knife switch shall be provided with a means for the connection of the smallest size wire having an ampacity equal to the rating of the device. Acceptable means of connection are as follows:
a) Terminal pads for the mounting of wire connectors or connection of bus bars;
b) A wiring terminal provided with a soldering lug firmly bolted or held by a screw or provided with a pressure-wire connector; and
c) A wire-binding screw employed at a wiring terminal intended for the connection of a 10 AWG (5.3 mm2) or smaller wire if an upturned lug or the equivalent is provided to hold the wire in position.
Exception: Knife switches without a base intended for mounting on pane/board, switchboard, or the like, need not comply with this requirement.
9.2 If a wire-binding screw is employed at a wiring terminal, the binding screw shall not be smaller than No. 10 (4.8 mm diameter), with no more than 32 threads per inch, except that a No. 8 (4.2 mm diameter) machine screw having no more than 32 threads per inch may be used at a terminal intended only for the connection of a 14 AWG (2.1 mm2) conductor.
9.3 A terminal plate for a wiring lug shall have sufficient area, and the stud shall be so located, that a clamped surface is provided between the plate and the lug such that the current density does not exceed 200 AIm2 (31.0 A/cm2).
9.4 A double-throw switch having three or more poles shall not have front-connected terminals for the hinge contacts of the inner pole or poles unless the required spacings between uninsulated live metal parts of opposite polarity are provided either by increased spacings between poles, or by the use of barriers as described in 11 .6 and 11.7.
10 Fuses and Fuseholders
10.1 If a knife switch has provision for fuses, the base on which fuseholders are mounted shall comply with the requirements in 6.1一6.8. A switch having the combination voltage rating 250 dc一500 ac shall not be provided with fuseholders, except as noted in 11.5.
10.2 The construction of a fuseholder shall be such that it cannot be used with a fuse having either a current rating greater than, or a voltage rating less than, that of the fuse size for which it is intended.