UL-1047:2015 pdf free download – STANDARD FOR SAFETY Isolated Power Systems Equipment.
b) Reliably securing such parts and insulating them from the mounting surface by means of a barrier, or the equivalent, or by means of through-air or over-surface spacings not less than the minimum values specified in Table 20.1.
9.5 With reference to 9.4, a lock washer, properly applied, is acceptable as a means of preventing the loosening of a screw or nut.
9.6 With reference to 9.4(a), determination of the softening point of a sealing compound is to be made in accordance with the American Society for Testing and Materials Standard Test for Softening Point by Ring and Ball Apparatus, ASTM E28-1967.
10 Mounting of Parts
10.1 All parts shall be securely mounted in position and prevented from loosening or turning if such motion may affect adversely the normal performance of the equipment, or may increase the risk of fire, shock, and injury to persons incident to the operation of the equipment.
10.2 Uninsulated live metal parts shall be secured to their supporting surfaces so that they will be prevented from turning or shifting in position if such motion may result in a reduction of spacings to less than those indicated in Table 20.1. The security of contact assemblies shall be such as to ensure the continued alignment of contacts. See also 13.9.
10.3 With reference to 10.1 and 10.2, friction between surfaces is not acceptable as a means to prevent turning, loosening, or shifting of a part; but a suitable lock washer, properly applied, may be accepted.
10.4 The wiring of an electrical component mounted on a door or hinged cover shall be factory installed using suitable pressure wire connectors, at each end, that comply with the Standard for Wire Connectors, UL 486A-486B. There shall be no provision for connection of field wiring.
Exception No. 1: Quick-connect terminals may be used for signal lights, buzzers or switches, if clamps or the equivalent are provided where necessary to prevent stress on the terminations.
Exception No. 2: Provision may be made for field-installation of clocks, timers, or lighting fixtures by means of plugs and receptacles.
10.5 Wires connected to a component mounted on a door or hinged cover shall:
a) Not be larger than 12 AWG (3.3 mm2),
b) Be stranded,
c) Have at least 1/32 in (0.79 mm) thick insulation, and
d) Be cabled or routed so as to avoid being damaged during opening and closing of the door or hinged cover.
Exception No. 1: A bundle or cable of not more than 12 wires, in addition to the bonding wire mentioned in 10.6, may contain 10 A WG (5.3 mm2) wires.
Exception No. 2: A bundle or cable of not more than 4 wires, in addition to the bonding wire mentioned in 10.6, may contain 10 A WG wires.
10.12 The cover of a remote assembly that is intended to be field wired shall have suitable means for its support during field wiring so that the cover assembly does not hang completely on the connected wires. This may be accomplished by the use of hinges, by instructions and design to permit hanging the cover from the lower box cover screws, or the equivalent.
10.13 If parts are held together by screws, a metal threaded part shall have no fewer than two full, clean-cut threads engaged. If the screw does not extend all the way through a threaded part, the taper or lead and the first full thread are to be disregarded in a determination of the number of threads engaged.