UL 1429:2000 pdf download – Pullout Switches
UL 1429:2000 pdf download – Pullout Switches.
17.3 For an enclosed pullout switch the wire-bending space at the line and load terminals shall be as specified in Table 17.1 for the conductor size that corresponds with the maximum ampere (full-load amperes) rating of the enclosed pullout switch. See 17.1,
Exception: Where the neutral line oi’ load, o both, terminal is not directed toward the enclosure wall opposite the corresponding phase line or load terminals, refer to Table 17.2 for the required wire bending space.
17.4 The distance mentioned in 16.8 and 17.3 is to be measured in a straight line from the edge of the wire terminal closest to the wall in a direction perpendicular to the box wall or barrier. The wire terminals shall be turned so that the axis of the wire opening in the connector is as close to perpendicular to the wall of the enclosure as it can assume without defeating any reliable means pi-ovided to prevent its turning, such as a boss, shoulder, walls of a recess, multiple bolts securing the connector, or the like. A barrier, shoulder, or the like is to be disregarded when the measurement is being made If It does not reduce the radius to which the wire must be bent. II a terminal is provided with one or more Connectors for the connection of conductors in multiple, the distance is to be measured from the wire opening closest to the wall of the enclosure.
Exception: Wire bending space specified in Table 17.2 Es measured in a sraight line from the center of the wire opening in the direction the wire leaves the terminal. See the exception to 17.3.
18 Provision for Bonding for Enclosed Pullout Switches
18.1 When an insulated neutral is provided, a main bonding jumper consisting of a separate screw, strap, or other means shall be provided to bond the enclosure of an enclosed pullout switch that is intended for use as service equipment to the insulated grounded circuit conductor (the insulated neutral) of an a-c circuit. The bonding means shall be of copper er aluminum and shall have a cross-section
19.6 The heating test may be conducted at any convenient voltage
19.7 II a machine is used as the means of test operation. the closure speed and opening speed shall not exceed 30-inch-per-second. The construction of the operator is to be such as to provide positive insertion and withdrawals of pullout type switches.
19.8 Except as noted in 24.1. all current-interrupnng tests shall be made on test circuits so adjusted that the closed-circuit voltage is not less than the rated voltage of the switch and the open-circuit voltage is not more than 110 percent of that voltage; excepl that for a switch rated at more than 25 hp or more than 100 A. the closed-circuit voltage may be as much as 10 percent less than the rated voltage of the switch if the open-circuit voltage is not less than the rated voltage nor more than 110 percent of that voltage. The open-circuit voltage may be more than 110 percent of the rated voltage if agreeable to those concerned.
19.9 To determine it a pullout switch complies with the requirements for shoa-circuit withstand, low level dielectric voltage-withstand and closing, as given in Sections 26— 29, a representative sample of each rating shall be subcted to the tests. A switch marked with two or more short-circuit withstand ratings shall be tested at each rating unless a test at one rating is representative of performance at the other ratings. See 48.1.
Exception: An unfused switch marked tar use th overcun’ent protective devices having a continuous current rating not greater than the switch rating and a tused switch incorporating tusehoiders of current rating not greater than the switch rating are acceptable for a 10,000 A short-circuit withstand rating without short-circuit testing.