UL 921:2016 pdf free download – STANDARD FOR SAFETY Commercial Dishwashers.
4.7.2.6 A dishwasher constructed so that it is adaptable upon installation to different supply voltages — for example, 120 V, 2-wire or 120/240 V, 3-wire — shall be provided with a means for making the connections during field installation without changing or disrupting internal wiring or connections other than at the point of field connection.
4.7.2.7 A dishwasher intended for connection to a grounded power-supply conductor shall have one terminal or lead identified for connection of the grounded conductor of the supply circuit when it employs:
a) an Edison-base screwshell lampholder;
b) a single-pole switch;
c) a single-pole automatic control; or
d) a ballast that is marked to specify the connection of a grounded circuit conductor.
4.7.2.8 The identified terminal or lead shall be connected to the screwshell of a lampholder and to the identified circuit conductor of a ballast when specified. The identified terminal or lead shall not be connected to a single-pole switch or a single-pole automatic control other than an auxiliary control complying with 4.22.10.
4.7.2.9 A field-wiring terminal for connection of a grounded power-supply conductor shall be of, or plated with, a metal substantially white in color and shall be readily distinguishable from other terminals; or proper identification of that terminal shall be clearly shown in some other manner, such as on a wiring diagram adjacent to the terminal.
4.7.2.10 The surface of a lead intended for field connection of a grounded power-supply conductor shall be white or gray, and that lead shall be readily distinguishable from other leads.
4.7.2.11 The requirements in 4.7.2.10 related to color coding do not apply to internal wiring.
4.7.2.12 For a lead intended to be spliced in the field to an external conductor:
a) the lead shall not be smaller than 18 AWG (0.82 mm2);
b) the insulation shall not be less than 0.8 mm (1/32 in) thick; and
c) the free length of the lead inside an outlet box or wiring compartment shall not be less than 152 mm (6 in) unless the use of a lead 152 mm (6 in) or longer results in a risk of fire or electric shock.
4.7.2.13 A field-wiring terminal or lead shall be rated for the connection of conductors having an ampacity not less than:
a) the rating of the branch circuit marked on the dishwasher in accordance with 14.4 or 14.13; or
b) the current rating of the dishwasher when the dishwasher is not marked as indicated in (a).
4.7.2.14 The ratings of field-wiring terminals and leads of a dishwasher rated 100 A or less shall be based on the use of power-supply wires rated 60°C (140°F). For a dishwasher rated more than 100 A, the ratings shall be based on the use of power-supply conductors rated 75°C (167°F).
4.7.2.15 A field-wiring terminal shall be provided with a soldering lug, a pressure wire connector , or a wire-binding screw at a terminal intended to accommodate an 8 AWG (8.4 mm2) or smaller conductor. The lug or connector shall be firmly bolted or held by a screw. For a wire-binding screw, upturned lugs or the equivalent shall be provided to hold the wire in position.
4.7.2.16 A field-wiring terminal shall not rotate.
4.7.2.17 A wire-binding screw shall thread into metal.
4.7.2.18 A wire-binding screw at a field-wiring terminal:
a) shall not be smaller than No. 10;
b) shall be a No. 8 screw at a terminal intended for the connection of a 14 AWG (2.1 mm2) conductor; or
c) shall be a No. 6 screw for the connection of a 16 or 18 AWG (1.3 or 0.82 mm2) controlcircuit conductor.