Field Installed and/or Field Connected Appliance Controls

PROPOSED UL 244B

1 Scope

1.1 These requirements cover electrical controls that are complete in construction and designed specifically for installation in North America. These products are intended to be installed within the guidelines and requirements of the National Electrical Code, NFPA 70 and other relevant building codes. Note - Examples are cord-connected controls with standard NEMA plugs and receptacles, direct plug-in controls and controls intended to be mounted in wiring boxes.

1.2 This standard applies to sensing controls for non-industrial use. These controls may be remotely-actuated (near-field communications) and respond to motion, light, sound, infrared input signals (passive and active type), power line carrier signals, radio frequency input signals and similar stimuli. In combination with one or more of the aforementioned stimuli, these controls may also be time responsive. Single stimuli sensing controls (for instance, photoelectric switches) are covered under the scope of UL773A, the Standard for Photoelectric Switches. Multi-functional controls are covered under the scope of this standard provided that the product's primary function is not covered under another standard of safety.

1.3 This standard applies to controls that are located remote from the loads being controlled using near-field communication methods. If the output functions of the control are deemed safety-relevant and/or if there are internal protective circuits that are relied upon for the inherent safety of the control, then the circuits are investigated per the requirements of this standard.

1.4 This standard applies to controls having solid state circuitry (single device or interconnected series of components) that are complete in construction and designed with one or more I/O ports. Included are controls with one or more output switching components to directly or indirectly control all or a portion of non-industrial-type appliances, such as portable luminaires, audio/video equipment, pumps, including sump pumps, motors, etc. These controls typically respond directly or indirectly to sensors or remote actuated signals to affect operation or electronically store or process information by virtue of a memory system. This standard also applies to manual controls when such are electrically and/or mechanically integral with solid-state sensing controls.

1.5 Sensing controls for equipment not intended for normal household use, but which nevertheless may be used by the public, such as equipment intended to be used by laymen in shops, commercial installations and on farms, are within the scope of this standard.

1.6 For a control covered by this standard, it is assumed that:

a) No voltage greater than 600 V with reference to earth ground will be present in a control;

b) An isolation transformer, if provided, will generally furnish power at a lower potential than the primary voltage.;

If conditions other than these are provided, consideration shall be given to the need for additional requirements.

1.7 A control covered by this standard is a single device or a series of separate modules with interconnecting wiring employing one or more input power ports and, possibly, one or more signal ports, solid-state circuitry, and one or more output switching components to directly control all of the loads. The maximum number of integrated controlled outlets on the control shall not exceed four and the maximum total current draw of the control under continuous duty shall not exceed 85% of the branch circuit protection rating.

1.8 These requirements also cover controls intended for connection only to a low-voltage circuit of limited power supplied by a primary battery or by a Class 2 transformer.

1.9 These requirements do not cover a control intended for installation in appliances, refrigeration or air conditioning equipment or similar equipment. Such controls and those intended for the global market are covered by the Standard for Automatic Electrical Controls - Part 1: General Requirements, UL 60730-1, and/or the applicable Part 2 standard from the UL 60730 series.

1.10 Products that are intended to be used in conjunction with or part of a building automation control system are not covered under the scope of this standard. Such products are covered under the Standard for Automatic Electrical Controls - Part 1: General Requirements, UL 60730-1.

1.11 Products that serve as emergency shut-off devices for cooking equipment are covered under the scope of this standard and shall comply with the requirements of this standard. Additionally, such devices shall comply with the requirements related to the associated safety functions for emergency shut-off devices in supplement SB of UL 858 - safety of Electromechanical and electronic controls.

1.12 The following products are not covered under the scope of this standard:

This standard is not applicable to Controlled Receptacle - A wall-box mounted receptacle with integral switching means intended for energy management and building automation in accordance with Article 406.3 of the NEC and rated 15- and 20 -ampere, 250 Volts or less. Controlled Receptacles are investigated in accordance with the Outline of Investigation for Receptacles with Integral Switching Means, UL498B.

Controls that employ a dimming function as a primary function and are intended to be permanently installed in outlet boxes are covered under the Standard for Solid-State Dimming Controls, UL 1472.

Solid state fan speed controls provided with a power supply cord, those intended for permanent connection and direct plug-in devices are covered under the scope of the Standard for Solid-State Fan Speed Controls, UL 1917.

Controls of the light-sensitive or presence-sensitive types, or both; for indoor or outdoor service are covered under the scope of the Standard for Nonindustrial Photoelectric Switches for Lighting Control, UL 773A.

Clock-operated switches or timers that are either cord-connected or direct plug-in devices are covered under UL 60730-2-7, the standard for Timers and Time-switches.