UL-1053:2015 pdf free download – STANDARD FOR SAFETY Ground-Fault Sensing and Relaying Equipment.
9 Current-Carrying Parts
9.1 A current-carrying part shall have mechanical strength and current-carrying capacity for the service, and shall be of metal or other material that is acceptable for the particular application.
9.2 An uninsulated live part, including a terminal, shall be so secured to its supporting surface by a
method other than friction between surfaces that it will be prevented from turning or shifting in position if
such motion may result in reduction of spacings to less than those required in Table 14.1. The security of
a contact assembly shall provide the continued alignment of contacts.
10 Internal Wiring
10.1 The internal wiring of ground-fault protection equipment shall consist of standard building wire, fixture or appliance-wiring material acceptable for the purpose, when considered with respect to the temperature, voltage, and conditions of service to which the wiring is likely to be subjected within the equipment.
10.2 The internal wiring and connections between parts of a ground-fault protection system shall be protected or enclosed.
10.3 Wireways shall be smooth and entirely free from sharp edges, burrs, fins, moving parts and so forth, that may cause abrasion of the insulation on conductors.
10.4 A hole in a sheet-metal wall through which insulated wires pass and on the edges of which they may bear shall be provided with a smooth, well-rounded bushing or shall have a smooth, well-rounded surface upon which the wires may bear, to prevent abrasion of the insulation.
10.5 A bare conductor, including pigtails and coil leads, shall be so supported that the spacings required elsewhere in this standard will be maintained unless covered by insulating sleeving or tubing.
10.6 All joints and connections shall be mechanically secure and shall provide adequate and reliable electrical contact without strain on connections and terminals.
10.7 A splice shall be provided with insulation equivalent to that required for the wires involved.
11 Supply Connections
11.1 General
11.1.1 In 11.1.2 — 11.2.8, and particularly where the wiring terminals of stationary equipment are mentioned, supply connections are considered to be those that are made in the field when a device is installed.
11 .1 .2 Ground-fault sensing and relaying equipment shall be provided with wiring terminals or leads for the connection of conductors.
11.1.3 A lead that is intended to be spliced in the field to a circuit conductor in accordance with the National Electrical Code, ANSI/NFPA 70, shall not be smaller in size than 18 AWG (0.82 mm2) and the insulation shall not be less than 1/32 inch (0.8 mm) in thickness.
11.1.4 The minimum free length of a lead for field connection shall be 6 inches (152 mm).
11.1.5 The insulation on a lead intended for connection of a grounded conductor shall be substantially white or gray in color and shall be readily distinguishable from other leads. No other lead shall be so identified.
11.2 Terminals
11.2.1 Terminals provided for field connection shall be capable of accommodating 12 AWG (3.3 mm2) aluminum and 14 — 18 AWG (2.1 — 0.82 mm2) copper conductors. Solder lugs shall not be used.
Exception: A terminal marked for copper wire only, need only be capable of accommodating 14 — 18 A WG conductors.