UL 244B OUTLINE
Outline of Investigation for Cord-Connected Controls with Standard NEMA Plugs and Receptacles, Direct Plug-In Controls, and Controls Intended to be Mounted in Wiring Boxes
|Publication Date:||29 October 2018|
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. Products such as cord-connected controls with standard NEMA plugs and receptacles, direct plug-in controls and controls intended to be mounted in wiring boxes are covered under the scope of this standard.
For a control covered by this outline, it is assumed that:
a) No voltage greater than 600 V above 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, and
c) The output of the control will not be located in a circuit operating at greater than 600 V above ground in the end-use product.
If conditions other than these are provided, consideration shall be given to the need for additional requirements.
A control covered by this outline is a single device or a series of separate components with interconnecting wiring employing one or more input power and possibly 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 shall not exceed 85% of the branch circuit protection rating.
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, where a failure of a component within the control would result a risk of fire, electric shock, or injury to persons.
These requirements do not cover a control intended for installation in, on or in association with appliances, refrigeration or air conditioning equipment or similar equipment. Such equipment and those intended for the global market are covered in 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.
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 UL 60730-1, the standard for Automatic Electrical Controls.
The following products are not covered under the scope of this standard:
• Receptacles with integral Switching Means - Such products are covered under UL 498B, Outline of Investigation for Receptacles with Integral Switching Means.
• Controls that employ a dimming function as a primary function and are intended to be permanently installed in outlet boxes are covered under UL 1472, the Standard for Solid-State Dimming Controls.
• 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 UL 1917, the Standard for Solid-State Fan Speed Controls.
• Controls of the light-sensitive or presence-sensitive types, or both; for indoor or outdoor service are covered under the scope of UL 773A, the Standard for Nonindustrial Photoelectric Switches for Lighting Control.