UL 979:2020 pdf download.STANDARD FOR SAFETY-Water Treatment Appliances.
1.1 These requirements cover electrically operated water treatment appliances for household and commercial use. These appliances are intended for installation and use in accordance with the National Electrical Code, NFPA 70, and are rated 600 V or less.
1.2 These requirements cover appliances utilizing features that treat water through the use of cation exchange water softeners, ionization, filters, ultraviolet radiation, ozone generation, and reverse osmosis.
1.3 These requirements do not cover water treatment appliances for use with pools or spas, water distillers, aquariums, or other equipment connected to plumbing that is covered by individual requirements.
1.4 These requirements do not cover appliances for use in hazardous locations as defined in the National Electrical Code, NFPA 70.
1.5 These requirements do not cover the aesthetic effects or the effectiveness of water treatment.
2 Glossary
2.1 For the purpose of this standard the following definitions apply.
2.2 APPLIANCE — A collective term to designate all products covered by this Standard.
2.3 APPLIANCE COUPLER — A single-outlet, female contact device for attachment to a flexible cord as part of a detachable power-supply cord to be connected to an appliance inlet (motor attachment plug).
2.4 APPLIANCE INLET (MOTOR ATTACHMENT PLUG) — A male contact device mounted on an end product appliance to provide an integral blade configuration for the connection of an appliance coupler or cord connector.
2.5 APPLIANCE, PERMANENTLY-CONNECTED — An appliance intended to be permanently connected electrically.
2.6 APPLIANCE (FLATIRON) PLUG — An appliance coupler type of device having a cord guard and a slot configuration specified for use with heating or cooking appliances.
2.7 APPLIANCE, PORTABLE — An appliance with the following characteristics:
a) The appliance is cord- and plug-connected;
b) The operating literature and installation instructions illustrate connecting the water lines to the output of a sink-type faucet. The connection to the sink-type faucet does not require tools, or the appliance is provided with its own water container;
c) The operating literature and installation instructions do not portray placing the appliance under the cabinet or a dedicated space, and they only illustrate placing the appliance on a counter top near the sink; and
d) The appliance has feet or keyhole slots and does not have non-keyhole slots or other more permanent mounting means
2.8 APPLIANCE, STATIONARY — An appliance connected to plumbing and not expected to be moved except during servicing or storage. A stationary appliance may have wheels or casters.
2.9 BARRIER — A partition for the insulation or isolation of electric circuits, for the isolation of electric arcs, or for isolation of moving parts or hot surfaces. In this respect, a barrier may serve as a portion of an enclosure or as a functional part.
2.10 CAPACITOR, CLASS X — Capacitor or RC unit of a type suitable for use in situations where failure of the capacitor or RC unit would not lead to danger of electrical shock but could result in a risk of fire. Examples would be units connected phase to phase or phase to neutral.UL 979 pdf download.