UL 2161:2016 pdf free download – STANDARD FOR SAFETY Neon Transformers and Power Supplies.
c) At least 3-1/2 to 5 threads shall be provided when the threads are not formed through the entire length of the hole, or at least 5 threads when the threads are formed through the length of the hole.
14.1.5 A field-wiring compartment provided as part of a neon supply shall be located so that the connections are accessible for inspection without disturbing wiring connections after the neon supply is installed as intended.
14.1.6 The attachment means of a field-wiring compartment shall not result in incidental rotation of the compartment.
14.1.7 A neon supply that incorporates one or more of the following supply-circuit components in which polarity is to be maintained shall have one lead or terminal identified for the connection of a grounded (neutral or common) conductor of the supply circuit:
a) Single pole switch,
b) Overcurrent device,
c) Single pole interrupt component,
d) Single pole overtemperature component, or
e) Any other component or construction feature that relies on maintaining polarity.
14.1.8 When a field-wiring compartment is provided on a neon supply, the input and output field-wiring leads and terminals shall not occupy the same compartment.
Exception: When the input field-wiring leads and terminals are located at one end of a neon supply, and the output field-wiring leads and terminals are located at the opposite end, they are not prohibited from being located in the same neon supply enclosure when a conduit connection means is provided at each end of the enclosure.
14.2 Supply terminals
14.2.1 A field-wiring terminal shall be of the pressure-wire connector or wire-binding screw type and shall be capable of being used for connection to solid 10 — 14 AWG (5.3 mm2 — 2.1 mm2) conductors.
Exception: A field-wiring terminal that complies with the Standard for Wire Connectors, UL 486A-486B, is not required to be further investigated.
14.2.2 A pressure-type wire terminal shall comply with the Standard for Equipment Wiring Terminals for Use with Aluminum and/or Copper Conductors, UL 486E.
14.2.3 A wire-binding screw terminal shall either comply with the Standard for Terminal Blocks, UL 1059, or:
a) Shall be No. 8 (4.2 mm) diameter or larger where the head of the screw and a baseplate shall cover at least three-quarters of the conductor as illustrated in Figure 14.1 and
b) The base plate shall have a tapped hole of metal not less than 0.030-in (0.76-mm) thick and shall not have fewer than two full threads in the metal.
14.2.4 A wire-binding screw and an individual stud with nut shall be provided with a means of captivating a conductor such as a cupped washer or screw having a raised ridge on the outer edge of the underside of the screw head.
Exception: A wire-binding screw that is secured in a base material that complies with 14.2.3 and Figure 14.1 is not required to be provided with additional means.
14.2.5 A terminal intended for connection of a grounded supply (neutral) conductor shall be made of or plated with metal substantially white or silver in color and no other terminals shall be white or silver in color.
Exception: A terminal intended for connection of a grounded supply (neutral) conductor is not required to have a distinguishing color when marked on or adjacent to the terminal with the words “NEUTRAL, “COMMON,”“N,” or when the symbols “—“ and “÷“ are provided on the supply terminals. The lettering and symbols shall be minimum 1/4-in (6.4-mm) high. Ink, paint, die-stamping and other similar marking means are not prohibited from being used as the marking method.