UL 979-2016 pdf download

UL 979-2016 pdf download.Water Treatment Appliances.
13.1.4 For other than a portable, household, counter.top. appliance, the cord:
a) Shall be Type S. SE, SJ, SJE, SJEO. SJO, SJOO, SJT, SJTO, SJTOO, SO. S00, ST, STO, or STOO:
b) Shall include the suffix “N” following the cord type, unless the appliance is marked for indoor use only: and
C) Include an equipment-grounding conductor.
13.1.5 A power-supply cord shall be rated for use at a voltage not less than the rated voltage of the appliance and shall not have an ampacity. as given for the type in the National Electrical Code, NFPA 70, lower than the current rating of the appliance
13.1.6 The attachment-plug for connection to the branch-circuit supply shall have an American National Standard pin configuration and American National Standard ratings. It shall be of a type suitable for use:
a) With a current not less than 125 percent of the rated current of the appliance: and
b) At a voltage equal to the rated voltage of the appliance. If the appliance can be adapted for use on two or more different supply voltages by held alteration of internal connections, the attachment plug provided with the appliance shall be rated for the voltage for which the appliance is connected when it is shipped from the factory. See 68.12.
13.1.7 A household appliance intended for use with a detachable cord set shall not be provided with terminal pins that will accommodate a standard flatiron or appliance plug.
13.1.8 A three-wire to two-wire, groundingtype adapter shall not be provided with an appliance.
13.1.9 If an appliance incorporates a removable cord set, the arrangement shall not expose live part under normal conditions,
13.2 StraIn relief
13.2.1 Strain relief shall be provided so that mechanical stress on a flexible cord is not transniitled to terminals, splices, or wiring within the appliance.
13.2.2 A metal strain-relief clamp or band used with Type SP-2 or SPE-2 cord shall be provided with auxiliary insulation over the cord for mechanical protection.
132.3 A clamp of any material — metal or otherwise — is not acceptable for use on Type SPT-2 cord.
Exception No. 1: The cons fruct,on may be acceptable it the cord is protected by varnished-cloth tubing or the equivalent under the clamp.
Exception No. 2: A clamp may be used if it has been inveshgated and found to be acceptable.
13.24 For cord Types S, SO, ST. STO, SJ, SJT, or SJTO, a clamp may be employed and the auxiliary insulation is not required unless it is determined that the clamp can damage the cord Insulahon.
132.5 Means shall be provided to prevent an attached flexible cord from being pushed into the enclosure of the appliance through the cord-entry hole when such displacement results In:
a) Subjecting the cord to mechanical damage:
b) Exposing the cord to a temperature higher than that for which it is rated:
C) Reducing spacings, such as to a metal strain-relief clamp, below the minimum required values: or
d) Damaging internal connections or components.
To determine compliance, the cord shall be tested in accordance with the Push-Back Relief Test. Section 52.
13.2.6 If a knot in a flexible cord serves as strain relief, the surfaces that the knot can contact shall be free from projections, sharp edges, burrs, fins, and similar features that can cause abrasion of the insulation on the conductors.
13.3 Bushings
13.3.1 At a point where a flexible cord passes through an opening in a wall, barner. or enclosing case, there shall be a bushing or the equivalent that is reliably secured in place, and has a smooth, rounded surface against which the cord can bear. A cord hole In wood, porcelain, phenolic composition, or other nonconducting material having a smooth, rounded surface is considered to be equivalent to a bushing.
13.3.2 An Insulating bushing shall be provided if:
a) Type SPT 2 cord is employed; b) The wall or barrier is of metal: or
c) The construction is such that the cord might be subjected to strain or motion.
Exception: An insulated metal grommet having insulating material that is not less than 1t32 in (0.8 mm) thick and fills completely the space between the grommet and the metal In which it is mounted may be used instead of an insulating beshing.
13.3.3 Ceramic materials and some molded compositions are generally acceptable for insulating bushings.
1334 A separate bushing shall not be made of wood or of hot-molded shellac-and-tar compositions.