UL 174:2020 free download

UL 174:2020 free download Household Electric Storage Tank Water Heaters
11.2.5 The accessibility for inspection required in 11.2.4 is identified as intended when, after the heaterhas been installed in its intended operating position, the connections are examined without using a tool ofother than the ordinary type, such as an offset screw driver, and similar tools, or disturbing the wiring in theterminal compartment. It is to be assumed that the rear of a water heater of the table-top type is in contactwith a vertical wall, and that cabinets as high and as deep as the heater are in contact with the sides of theheater. The possibility of installation close to vertical walls is to be disregarded in evaluating a heater thatis cylindrical in shape.
11.2.6 Wiring space or other compartments intended to enclose wires that are field installed shall be freeof any sharp edge, burr, or fin that damages the conductor insulation.
11.2.7 Electrical (Junction) boxes shall comply with the Standard for Metallic Outlet Boxes,UL 514A orthe Standard for Nonmetallic Outlet Boxes,Flush-Device Boxes, and Covers, UL 514C, as applicable.
11.2.8 Fittings for conduit and/or metal clad cable shall comply with the Standard for Conduit,Tubing.and Cable Fittings,UL 514B.
11.3 Field-wiring terminals and leads
11.3.1 A water heater shall be provided with wiring terminals or with pigtail leads for connection to thesupply conductors.
11.3.2 Each wiring terminal shall accommodate connection of supply conductors having an ampacity ofno less than 125 percent of the current the equipment draws. When the current is 24 amperes or less, theterminal shall be able to accommodate the connection of a 10 AWG (5.3 mm2) copper wire, or a 8 AWG(8.4 mm2 ) aluminum wire when the equipment is to be connected with aluminum supply conductors.
11.3.3 A pigtail lead shall be no more than two wire sizes smaller than the supply conductor (copper) towhich it is connected.
Exception: Multiple leads, when provided, are not required to comply with this requirement when the sumof the conductor cross-sectional areas of such leads for any given pole are equivalent to the size specifiedin this paragraph; however, in no case shall any pigtail lead be smaller than 14 AWG (2.1 mm2).
11.3.4 The free length of a lead inside an outlet box or wiring compartment shall be at least 6 inches (152mm) when the lead is intended for field connection to an external circuit.
11.3.5 A field-wiring terminal, that is in accordance with the marking described in 49.5, shall be capableof being used for the connection of either:
a) A copper supply conductor only; or
b)An aluminum or a copper supply conductor.
11.3.6 A wiring terminal shall be provided with a soldering lug bolted or held by a screw,or with apressure wire connector.
Exception:A wire-binding screw is capable of being used at a wiring terminal for the connection of a 10AWG (5.3 mm2) or smaller conductor when upturned lugs or the equivalent are provided to hold the wire inposition.